| Compensation and Retirement Disclosure [Abstract] | Period [Axis] | 
|---|
2016-01-01 - 2016-12-31  | 
|---|
Compensation and Retirement Disclosure [Abstract]  |    | 
Defined benefit plan funded status of plan  | Below is the reconciliation of the beginning and ending balances of benefit obligations, fair value of plan assets and the funded status of our plans. 
 
  |   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |     | U.S. Pension Benefits  |    | Non-U.S. Pension Benefits  |    | Other Postretirement Benefits  |      | 2016  |    | 2015  |    | 2016  |    | 2015  |    | 2016  |    | 2015  |  Change in benefit obligation:  |    |    |    |    |    |    |    |    |    |    |    |  Benefit obligation at beginning of year  | $  | 735  | 
 
  |    | $  | 728  | 
 
  |    | $  | 798  | 
 
  |    | $  | 872  | 
 
  |    | $  | 107  | 
 
  |    | $  | 122  | 
 
  |  Service cost  | 52  | 
 
  |    | 64  | 
 
  |    | 14  | 
 
  |    | 15  | 
 
  |    | 4  | 
 
  |    | 5  | 
 
  |  Interest cost  | 29  | 
 
  |    | 26  | 
 
  |    | 27  | 
 
  |    | 30  | 
 
  |    | 4  | 
 
  |    | 4  | 
 
  |  Actuarial loss (gain)  | (13  | )  |    | (4  | )  |    | 165  | 
 
  |    | (23  | )  |    | —  | 
 
  |    | (10  | )  |  Benefits paid  | (63  | )  |    | (59  | )  |    | (38  | )  |    | (35  | )  |    | (14  | )  |    | (11  | )  |  Curtailment  | (12  | )  |    | (24  | )  |    | (2  | )  |    | (2  | )  |    | (4  | )  |    | (2  | )  |  Other  | (2  | )  |    | 4  | 
 
  |    | —  | 
 
  |    | (6  | )  |    | —  | 
 
  |    | (1  | )  |  Foreign currency translation adjustments  | —  | 
 
  |    | —  | 
 
  |    | (118  | )  |    | (53  | )  |    | —  | 
 
  |    | —  | 
 
  |  Benefit obligation at end of year  | 726  | 
 
  |    | 735  | 
 
  |    | 846  | 
 
  |    | 798  | 
 
  |    | 97  | 
 
  |    | 107  | 
 
  |     |    |    |    |    |    |    |    |    |    |    |    |  Change in plan assets:  |    |    |    |    |    |    |    |    |    |    |    |  Fair value of plan assets at beginning of year  | 595  | 
 
  |    | 648  | 
 
  |    | 713  | 
 
  |    | 767  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |  Actual return on plan assets  | 29  | 
 
  |    | (5  | )  |    | 118  | 
 
  |    | 4  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |  Employer contributions  | 44  | 
 
  |    | 16  | 
 
  |    | 24  | 
 
  |    | 28  | 
 
  |    | 14  | 
 
  |    | 11  | 
 
  |  Benefits paid  | (63  | )  |    | (59  | )  |    | (38  | )  |    | (35  | )  |    | (14  | )  |    | (11  | )  |  Other  | (5  | )  |    | (5  | )  |    | —  | 
 
  |    | (6  | )  |    | —  | 
 
  |    | —  | 
 
  |  Foreign currency translation adjustments  | —  | 
 
  |    | —  | 
 
  |    | (118  | )  |    | (45  | )  |    | —  | 
 
  |    | —  | 
 
  |  Fair value of plan assets at end of year  | 600  | 
 
  |    | 595  | 
 
  |    | 699  | 
 
  |    | 713  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |     |    |    |    |    |    |    |    |    |    |    |    |  Funded status - underfunded at end of year  | $  | (126  | )  |    | $  | (140  | )  |    | $  | (147  | )  |    | $  | (85  | )  |    | $  | (97  | )  |    | $  | (107  | )  |     |    |    |    |    |    |    |    |    |    |    |    |  Accumulated benefit obligation  | $  | 682  | 
 
  |    | $  | 681  | 
 
  |    | $  | 810  | 
 
  |    | $  | 763  | 
 
  |    | $  | 97  | 
 
  |    | $  | 107  | 
 
  |  
     | 
Amounts recognized in the consolidated balance sheets  | The amounts recognized in the consolidated balance sheets consist of the following at December 31: 
 
  |   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |     | U.S. Pension Benefits  |    | Non-U.S. Pension Benefits  |    | Other Postretirement Benefits  |      | 2016  |    | 2015  |    | 2016  |    | 2015  |    | 2016  |    | 2015  |  Noncurrent assets  | $  | —  | 
 
  |    | $  | —  | 
 
  |    | $  | 3  | 
 
  |    | $  | 51  | 
 
  |    | $  | —  | 
 
  |    | $  | —  | 
 
  |  Current liabilities  | (1  | )  |    | (2  | )  |    | (6  | )  |    | (6  | )  |    | (16  | )  |    | (16  | )  |  Noncurrent liabilities  | (125  | )  |    | (138  | )  |    | (144  | )  |    | (130  | )  |    | (81  | )  |    | (91  | )  |  Net amount recognized  | $  | (126  | )  |    | $  | (140  | )  |    | $  | (147  | )  |    | $  | (85  | )  |    | $  | (97  | )  |    | $  | (107  | )  |  
     | 
Accumulated benefit obligations in excess of plan assets  | Information for the plans with ABOs in excess of plan assets is as follows at December 31: 
 
  |   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |     | U.S. Pension Benefits  |    | Non-U.S. Pension Benefits  |    | Other Postretirement Benefits  |      | 2016  |    | 2015  |    | 2016  |    | 2015  |    | 2016  |    | 2015  |  Projected benefit obligation  | $  | 725  | 
 
  |    | $  | 735  | 
 
  |    | $  | 821  | 
 
  |    | $  | 149  | 
 
  |    | n/a  | 
 
  |    | n/a  | 
 
  |  Accumulated benefit obligation  | $  | 682  | 
 
  |    | $  | 681  | 
 
  |    | $  | 786  | 
 
  |    | $  | 114  | 
 
  |    | $  | 97  | 
 
  |    | $  | 107  | 
 
  |  Fair value of plan assets  | $  | 600  | 
 
  |    | $  | 595  | 
 
  |    | $  | 672  | 
 
  |    | $  | 12  | 
 
  |    | n/a  | 
 
  |    | n/a  | 
 
  |  
     | 
Weighted average assumptions used to determine benefit obligations  | Weighted average assumptions used to determine benefit obligations for these plans are as follows for the years ended December 31: 
 
  |   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |     | U.S. Pension Benefits  |    | Non-U.S. Pension Benefits  |    | Other Postretirement Benefits  |      | 2016  |    | 2015  |    | 2016  |    | 2015  |    | 2016  |    | 2015  |  Discount rate  | 4.0  | %  |    | 4.2  | %  |    | 2.6  | %  |    | 3.7  | %  |    | 3.6  | %  |    | 3.7  | %  |  Rate of compensation increase  | 5.5  | %  |    | 5.9  | %  |    | 4.2  | %  |    | 4.1  | %  |    | n/a  | 
 
  |    | n/a  | 
 
  |  Social security increase  | 2.8  | %  |    | 2.8  | %  |    | 2.0  | %  |    | 2.2  | %  |    | n/a  | 
 
  |    | n/a  | 
 
  |  
     | 
Accumulated other comprehensive loss  | The amount recorded before-tax in accumulated other comprehensive loss related to employee benefit plans consists of the following at December 31: 
 
  |   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |     | U.S. Pension Benefits  |    | Non-U.S. Pension Benefits  |    | Other Postretirement Benefits  |      | 2016  |    | 2015  |    | 2016  |    | 2015  |    | 2016  |    | 2015  |  Net actuarial loss  | $  | 166  | 
 
  |    | $  | 191  | 
 
  |    | $  | 266  | 
 
  |    | $  | 229  | 
 
  |    | $  | 6  | 
 
  |    | $  | 10  | 
 
  |  Net prior service cost (credit)  | —  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | (37  | )  |    | (54  | )  |  Total  | $  | 166  | 
 
  |    | $  | 191  | 
 
  |    | $  | 266  | 
 
  |    | $  | 229  | 
 
  |    | $  | (31  | )  |    | $  | (44  | )  |  
     | 
Net periodic cost  | The components of net periodic cost are as follows for the years ended December 31: 
 
  |   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |     | U.S. Pension Benefits  |    | Non-U.S.  Pension Benefits  |    | Other Postretirement Benefits  |      | 2016  |    | 2015  |    | 2014  |    | 2016  |    | 2015  |    | 2014  |    | 2016  |    | 2015  |    | 2014  |  Service cost  | $  | 52  | 
 
  |    | $  | 64  | 
 
  |    | $  | 70  | 
 
  |    | $  | 14  | 
 
  |    | $  | 15  | 
 
  |    | $  | 11  | 
 
  |    | $  | 4  | 
 
  |    | $  | 5  | 
 
  |    | $  | 6  | 
 
  |  Interest cost  | 29  | 
 
  |    | 26  | 
 
  |    | 28  | 
 
  |    | 27  | 
 
  |    | 30  | 
 
  |    | 34  | 
 
  |    | 4  | 
 
  |    | 4  | 
 
  |    | 5  | 
 
  |  Expected return on plan assets  | (41  | )  |    | (49  | )  |    | (44  | )  |    | (33  | )  |    | (47  | )  |    | (41  | )  |    | —  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |  Amortization of prior service credit  | —  | 
 
  |    | 1  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | (9  | )  |    | (11  | )  |    | (11  | )  |  Amortization of net actuarial loss  | 11  | 
 
  |    | 9  | 
 
  |    | 8  | 
 
  |    | 6  | 
 
  |    | 6  | 
 
  |    | 5  | 
 
  |    | —  | 
 
  |    | 1  | 
 
  |    | 1  | 
 
  |  Curtailment gain  | —  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | (2  | )  |    | (1  | )  |    | —  | 
 
  |    | (7  | )  |    | (17  | )  |    | —  | 
 
  |  Other  | 3  | 
 
  |    | 8  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | (3  | )  |  Net periodic cost  | $  | 54  | 
 
  |    | $  | 59  | 
 
  |    | $  | 62  | 
 
  |    | $  | 12  | 
 
  |    | $  | 3  | 
 
  |    | $  | 9  | 
 
  |    | $  | (8  | )  |    | $  | (18  | )  |    | $  | (2  | )  |  
     | 
Weighted average assumptions used to determine net periodic cost  | Weighted average assumptions used to determine net periodic cost for these plans are as follows for the years ended December 31: 
 
  |   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |     | U.S. Pension Benefits  |    | Non-U.S.  Pension Benefits  |    | Other Postretirement  Benefits  |      | 2016  |    | 2015  |    | 2014  |    | 2016  |    | 2015  |    | 2014  |    | 2016  |    | 2015  |    | 2014  |  Discount rate  | 4.2  | %  |    | 3.7  | %  |    | 4.5  | %  |    | 3.7  | %  |    | 3.5  | %  |    | 4.4  | %  |    | 3.7  | %  |    | 3.3  | %  |    | 4.0  | %  |  Expected long-term return on plan assets  | 7.0  | %  |    | 7.6  | %  |    | 7.3  | %  |    | 5.0  | %  |    | 6.3  | %  |    | 6.1  | %  |    | n/a  | 
 
  |    | n/a  | 
 
  |    | n/a  | 
 
  |  Rate of compensation increase  | 5.7  | %  |    | 5.8  | %  |    | 5.6  | %  |    | 4.1  | %  |    | 4.1  | %  |    | 4.4  | %  |    | n/a  | 
 
  |    | n/a  | 
 
  |    | n/a  | 
 
  |  Social security increase  | 2.8  | %  |    | 2.8  | %  |    | 2.8  | %  |    | 2.1  | %  |    | 2.1  | %  |    | 2.4  | %  |    | n/a  | 
 
  |    | n/a  | 
 
  |    | n/a  | 
 
  |  
     | 
Effect of one-percentage point change in assumed health care cost trend rates  | A one percentage point change in assumed health care cost trend rates would have had the following effects on 2016: 
 
  |   |  |  |  |  |  |  |  |     | One Percentage Point Increase  |    | One Percentage Point Decrease  |  Effect on total of service and interest cost components  | $  | 0.1  | 
 
  |    | $  | (0.1  | )  |  Effect on postretirement welfare benefit obligation  | $  | 0.9  | 
 
  |    | $  | (1.2  | )  |  
     | 
Fair values of the assets in U.S. Plan  | The table below presents the fair value of the assets in the U.S. Pension Plan by asset category and by valuation technique at December 31: 
 
  |   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |     | 2016  |    | 2015  |  Asset Category  | Total Asset Value  |    | Level One  |    | Level Two  |    | Level Three  |    | Total Asset Value  |    | Level One  |    | Level Two  |    | Level Three  |  Cash and Cash Equivalents  | $  | 2  | 
 
  |    | $  | —  | 
 
  |    | $  | 2  | 
 
  |    | $  | —  | 
 
  |    | $  | 16  | 
 
  |    | $  | 12  | 
 
  |    | $  | 4  | 
 
  |    | $  | —  | 
 
  |  Fixed Income (1)  | 120  | 
 
  |    | —  | 
 
  |    | 120  | 
 
  |    | —  | 
 
  |    | 109  | 
 
  |    | —  | 
 
  |    | 109  | 
 
  |    | —  | 
 
  |  Non-U.S. Equity (2)  | 126  | 
 
  |    | 31  | 
 
  |    | 95  | 
 
  |    | —  | 
 
  |    | 129  | 
 
  |    | 31  | 
 
  |    | 98  | 
 
  |    | —  | 
 
  |  U.S. Equity (3)  | 131  | 
 
  |    | —  | 
 
  |    | 131  | 
 
  |    | —  | 
 
  |    | 129  | 
 
  |    | —  | 
 
  |    | 129  | 
 
  |    | —  | 
 
  |  Hedge Funds (4)  | 150  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | 150  | 
 
  |    | 152  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | 152  | 
 
  |  Real Estate Funds (5)  | 8  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | 8  | 
 
  |    | 10  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | 10  | 
 
  |  Real Estate Investment Trust Equity  | 12  | 
 
  |    | —  | 
 
  |    | 12  | 
 
  |    | —  | 
 
  |    | 9  | 
 
  |    | —  | 
 
  |    | 9  | 
 
  |    | —  | 
 
  |  Private Equity Fund (6)  | 51  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | 51  | 
 
  |    | 41  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | 41  | 
 
  |  Total  | $  | 600  | 
 
  |    | $  | 31  | 
 
  |    | $  | 360  | 
 
  |    | $  | 209  | 
 
  |    | $  | 595  | 
 
  |    | $  | 43  | 
 
  |    | $  | 349  | 
 
  |    | $  | 203  | 
 
  |  
  |  |  (1)   | A multi-manager strategy investing in fixed income securities and funds.  The current allocation includes:  39% in unconstrained bond funds; 25% in government bonds; 12% in corporate bonds; 10% in government mortgage-backed securities; 6% in a passive index bond; 1% in commercial mortgage-backed securities; 1% in short-term bills and notes; 1% in asset-backed securities; and 5% in cash and other securities.  |  
  |  |  (2)   | Multi-manager strategy investing in common stocks of non-U.S. listed companies using both value and growth approaches.  |  
  |  |  (3)   | Multi-manager strategy investing in common stocks of U.S. listed companies using value and growth approaches.  |  
  |  |  (4)   | Strategies taking long and short positions in equities, fixed income securities, currencies and derivative contracts.  |  
  |  |  (5)   | Strategy investing in the global private real estate secondary market using a value-based investment approach.  |  
  |  |  (6)   | Partnership making opportunistic investments on a global basis across asset classes, capital structures and geographies.  |  
     | 
Fair values of the assets in our Non-U.S Plans by asset category and by levels of fair value  | The table below presents the fair value of the assets in our Non-U.S. Plans by asset category and by valuation technique at December 31: 
 
  |   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |     | 2016  |    | 2015  |  Asset Category  | Total Asset Value  |    | Level One  |    | Level Two  |    | Level Three  |    | Total Asset Value  |    | Level One  |    | Level Two  |    | Level Three  |  Cash and Cash Equivalents  | $  | 5  | 
 
  |    | $  | 5  | 
 
  |    | $  | —  | 
 
  |    | $  | —  | 
 
  |    | $  | 5  | 
 
  |    | $  | 5  | 
 
  |    | $  | —  | 
 
  |    | $  | —  | 
 
  |  Asset Allocation (1)  | 122  | 
 
  |    | —  | 
 
  |    | 122  | 
 
  |    | —  | 
 
  |    | 152  | 
 
  |    | —  | 
 
  |    | 152  | 
 
  |    | —  | 
 
  |  Bonds - Canada - Corporate (2)  | 6  | 
 
  |    | —  | 
 
  |    | 6  | 
 
  |    | —  | 
 
  |    | 6  | 
 
  |    | —  | 
 
  |    | 6  | 
 
  |    | —  | 
 
  |  Bonds - Canada - Government (3)  | 17  | 
 
  |    | —  | 
 
  |    | 17  | 
 
  |    | —  | 
 
  |    | 19  | 
 
  |    | —  | 
 
  |    | 19  | 
 
  |    | —  | 
 
  |  Bonds - U.K. - Corporate (4)  | 8  | 
 
  |    | —  | 
 
  |    | 8  | 
 
  |    | —  | 
 
  |    | 8  | 
 
  |    | —  | 
 
  |    | 8  | 
 
  |    | —  | 
 
  |  Bonds - U.K. - Government (5)  | 225  | 
 
  |    | —  | 
 
  |    | 225  | 
 
  |    | —  | 
 
  |    | 211  | 
 
  |    | —  | 
 
  |    | 211  | 
 
  |    | —  | 
 
  |  Bonds - Global - Corporate (6)  | 57  | 
 
  |    | —  | 
 
  |    | 57  | 
 
  |    | —  | 
 
  |    | 64  | 
 
  |    | —  | 
 
  |    | 64  | 
 
  |    | —  | 
 
  |  Equities (7)  | 122  | 
 
  |    | —  | 
 
  |    | 122  | 
 
  |    | —  | 
 
  |    | 128  | 
 
  |    | —  | 
 
  |    | 128  | 
 
  |    | —  | 
 
  |  Real Estate Fund (8)  | 19  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | 19  | 
 
  |    | 23  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | 23  | 
 
  |  Pooled Swap Funds (9)  | 106  | 
 
  |    | —  | 
 
  |    | 106  | 
 
  |    | —  | 
 
  |    | 85  | 
 
  |    | —  | 
 
  |    | 85  | 
 
  |    | —  | 
 
  |  Insurance contracts  | 12  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | 12  | 
 
  |    | 12  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | 12  | 
 
  |  Total  | $  | 699  | 
 
  |    | $  | 5  | 
 
  |    | $  | 663  | 
 
  |    | $  | 31  | 
 
  |    | $  | 713  | 
 
  |    | $  | 5  | 
 
  |    | $  | 673  | 
 
  |    | $  | 35  | 
 
  |  
  |  |  (1)   | Invests in mixes of global common stocks and bonds to achieve broad diversification.  |  
  |  |  (2)   | Invests in Canadian Dollar-denominated high quality corporate bonds.  |  
  |  |  (3)   | Invests in Canadian Dollar-denominated government issued bonds intended to match the duration of plan liabilities.  |  
  |  |  (4)   | Invests passively in British Pound Sterling-denominated investment grade corporate bonds.  |  
  |  |  (5)   | Invests passively in British Pound Sterling-denominated government issued bonds.  |  
  |  |  (6)   | Invests globally in high quality corporate bonds.  |  
  |  |  (7)   | Invests in broad equity funds based on securities offered in various regions or countries.  Equity funds are allocated by region as follows:  47% Global; 32% U.K.; 7% Emerging Markets; 5% North America; 5% Asia Pacific; and 4% Europe.  |  
  |  |  (8)   | Invests in a diversified range of property throughout the U.K., principally in the retail, office and industrial/warehouse sectors.  |  
  |  |  (9)   | Invests in a range of pooled funds which include positions in swap contracts and U.K. sovereign bonds; pooled funds are categorized by maturities of underlying positions.  Pooled funds employ leverage in order to match the U.K. Plan's duration and inflation.  |  
     | 
Changes in the fair value of assets  | The following table presents the changes in the fair value of assets determined using level 3 unobservable inputs: 
 
  |   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |     | U.S. Private Equity Fund  |    | U.S. Real Estate Fund  |    | U.S. Hedge Funds  |    | Non-U.S. Real Estate Fund  |    | Non-U.S. Insurance Contracts  |    | Total  |  Balance at December 31, 2013  | $  | 16  | 
 
  |    | $  | 9  | 
 
  |    | $  | 190  | 
 
  |    | $  | 21  | 
 
  |    | $  | 18  | 
 
  |    | $  | 254  | 
 
  |  Unrealized gains (losses)  | —  | 
 
  |    | 1  | 
 
  |    | 6  | 
 
  |    | 1  | 
 
  |    | (1  | )  |    | 7  | 
 
  |  Realized gains  | 1  | 
 
  |    | —  | 
 
  |    | 7  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | 8  | 
 
  |  Sales  | (4  | )  |    | —  | 
 
  |    | (85  | )  |    | —  | 
 
  |    | —  | 
 
  |    | (89  | )  |  Purchases  | 8  | 
 
  |    | —  | 
 
  |    | 46  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | 54  | 
 
  |  Balance at December 31, 2014  | 21  | 
 
  |    | 10  | 
 
  |    | 164  | 
 
  |    | 22  | 
 
  |    | 17  | 
 
  |    | 234  | 
 
  |  Unrealized gains (losses)  | —  | 
 
  |    | —  | 
 
  |    | (6  | )  |    | —  | 
 
  |    | (2  | )  |    | (8  | )  |  Realized gains  | —  | 
 
  |    | 1  | 
 
  |    | 1  | 
 
  |    | —  | 
 
  |    | —  | 
 
  |    | 2  | 
 
  |  Sales  | (4  | )  |    | (2  | )  |    | (15  | )  |    | —  | 
 
  |    | (5  | )  |    | (26  | )  |  Purchases  | 24  | 
 
  |    | 1  | 
 
  |    | 8  | 
 
  |    | 1  | 
 
  |    | 2  | 
 
  |    | 36  | 
 
  |  Balance at December 31, 2015  | 41  | 
 
  |    | 10  | 
 
  |    | 152  | 
 
  |    | 23  | 
 
  |    | 12  | 
 
  |    | 238  | 
 
  |  Unrealized gains (losses)  | 3  | 
 
  |    | 1  | 
 
  |    | —  | 
 
  |    | (5  | )  |    | —  | 
 
  |    | (1  | )  |  Realized losses  | —  | 
 
  |    | —  | 
 
  |    | (1  | )  |    | —  | 
 
  |    | —  | 
 
  |    | (1  | )  |  Sales  | (5  | )  |    | (3  | )  |    | (22  | )  |    | —  | 
 
  |    | (3  | )  |    | (33  | )  |  Purchases  | 12  | 
 
  |    | —  | 
 
  |    | 21  | 
 
  |    | 1  | 
 
  |    | 3  | 
 
  |    | 37  | 
 
  |  Balance at December 31, 2016  | $  | 51  | 
 
  |    | $  | 8  | 
 
  |    | $  | 150  | 
 
  |    | $  | 19  | 
 
  |    | $  | 12  | 
 
  |    | $  | 240  | 
 
  |  
     | 
Expected future benefit payments  | The following table presents the expected benefit payments over the next ten years.  The U.S. and non-U.S. pension benefit payments are made by the respective pension trust funds. 
 
  |   |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  Year  | U.S. Pension Benefits  | Non-U.S. Pension Benefits  | Other Postretirement Benefits  |  2017  |    | $  | 46  | 
 
  |    |    | $  | 22  | 
 
  |    |    | $  | 16  | 
 
  |    |  2018  |    | $  | 44  | 
 
  |    |    | $  | 24  | 
 
  |    |    | $  | 12  | 
 
  |    |  2019  |    | $  | 46  | 
 
  |    |    | $  | 29  | 
 
  |    |    | $  | 10  | 
 
  |    |  2020  |    | $  | 47  | 
 
  |    |    | $  | 27  | 
 
  |    |    | $  | 9  | 
 
  |    |  2021  |    | $  | 48  | 
 
  |    |    | $  | 32  | 
 
  |    |    | $  | 9  | 
 
  |    |  2022-2026  |    | $  | 264  | 
 
  |    |    | $  | 182  | 
 
  |    |    | $  | 37  | 
 
  |    |  
     |