| Compensation and Retirement Disclosure [Abstract] | Period [Axis] |
|---|
2016-01-01 - 2016-12-31 |
|---|
Compensation and Retirement Disclosure [Abstract] | |
Schedule of Changes in Benefit Obligations, Fair Value of Plan Assets, and Funded Status of the Plans | The following sets forth changes in the benefit obligations and fair value of plan assets for the Company’s pension and other postretirement benefit plans for the years ended December 31, 2016 and 2015, as well as the funded status of the plans and amounts recognized in the financial statements at December 31, 2016 and 2015: | | | | | | | | | | | | | | | | | | Pension Benefits | | Other Benefits | millions | 2016 | | 2015 | | 2016 | | 2015 | Change in benefit obligation | | | | | | | | Benefit obligation at beginning of year | $ | 2,431 |
| | $ | 2,528 |
| | $ | 266 |
| | $ | 373 |
| Service cost | 99 |
| | 118 |
| | 3 |
| | 9 |
| Interest cost | 95 |
| | 101 |
| | 12 |
| | 15 |
| Plan amendments | — |
| | — |
| | — |
| | (89 | ) | Actuarial (gain) loss (1) | 211 |
| | (115 | ) | | 34 |
| | (27 | ) | Participant contributions | — |
| | — |
| | 4 |
| | 5 |
| Benefit payments | (513 | ) | | (194 | ) | | (23 | ) | | (20 | ) | Foreign-currency exchange-rate changes | (22 | ) | | (7 | ) | | — |
| | — |
| Benefit obligation at end of year (2) | $ | 2,301 |
| | $ | 2,431 |
| | $ | 296 |
| | $ | 266 |
|
| | | | | | | | | | | | | | | | | Change in plan assets | | | | | | | | Fair value of plan assets at beginning of year | $ | 1,674 |
| | $ | 1,818 |
| | $ | — |
| | $ | — |
| Actual return on plan assets | 107 |
| | 16 |
| | — |
| | — |
| Employer contributions | 101 |
| | 43 |
| | 19 |
| | 15 |
| Participant contributions | — |
| | — |
| | 4 |
| | 5 |
| Benefit payments | (513 | ) | | (194 | ) | | (23 | ) | | (20 | ) | Foreign-currency exchange-rate changes | (29 | ) | | (9 | ) | | — |
| | — |
| Fair value of plan assets at end of year | $ | 1,340 |
| | $ | 1,674 |
| | $ | — |
| | $ | — |
| | | | | | | | | Funded status of the plans at end of year | $ | (961 | ) | | $ | (757 | ) | | $ | (296 | ) | | $ | (266 | ) |
__________________________________________________________________ | | (1) | Includes $44 million of termination benefits and $2 million of curtailment expense for pension benefits, and $9 million of curtailment expense for other benefits at December 31, 2016, related to the Company’s workforce reduction program initiated in the first quarter of 2016. See Note 17—Restructuring Charges. |
| | (2) | The accumulated benefit obligation for all defined-benefit pension plans was $2.0 billion at December 31, 2016 and $2.1 billion at December 31, 2015. |
|
Schedule of Amounts Recognized in Balance Sheet | | | | | | | | | | | | | | | | | | Total recognized amounts in the balance sheet consist of | | | | | | | | Other assets | $ | 44 |
| | $ | 41 |
| | $ | — |
| | $ | — |
| Accrued expenses | (66 | ) | | (24 | ) | | (23 | ) | | (16 | ) | Other long-term liabilities—other | (939 | ) | | (774 | ) | | (273 | ) | | (250 | ) | Total | $ | (961 | ) | | $ | (757 | ) | | $ | (296 | ) | | $ | (266 | ) |
|
Schedule of Total Recognized Amounts in Accumulated Other Comprehensive Income | | | | | | | | | | | | | | | | | | Total recognized amounts in accumulated other comprehensive income consist of | | | | | | | | Prior service cost (credit) | $ | — |
| | $ | (1 | ) | | $ | (50 | ) | | $ | (84 | ) | Net actuarial (gain) loss | 616 |
| | 655 |
| | — |
| | (25 | ) | Total | $ | 616 |
| | $ | 654 |
| | $ | (50 | ) | | $ | (109 | ) |
|
Schedule of Defined-Benefit Pension Plans With Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets | The following summarizes the Company’s defined-benefit pension plans with accumulated benefit obligations in excess of plan assets for the years ended December 31: | | | | | | | | | millions | 2016 | | 2015 | Projected benefit obligation | $ | 2,175 |
| | $ | 2,309 |
| Accumulated benefit obligation | 1,866 |
| | 1,954 |
| Fair value of plan assets | 1,171 |
| | 1,511 |
|
|
Components of Net Periodic Benefit Cost Table | The following summarizes the Company’s pension and other postretirement benefit cost for the years ended December 31: | | | | | | | | | | | | | | | | | | | | | | | | | | Pension Benefits | | Other Benefits | millions | 2016 | | 2015 | | 2014 | | 2016 | | 2015 | | 2014 | Components of net periodic benefit cost | | | | | | | | | | | | Service cost | $ | 99 |
| | $ | 118 |
| | $ | 99 |
| | $ | 3 |
| | $ | 9 |
| | $ | 7 |
| Interest cost | 95 |
| | 101 |
| | 99 |
| | 12 |
| | 15 |
| | 15 |
| Expected (return) loss on plan assets | (97 | ) | | (109 | ) | | (106 | ) | | — |
| | — |
| | — |
| Amortization of net actuarial loss (gain) | 42 |
| | 52 |
| | 34 |
| | — |
| | — |
| | (7 | ) | Amortization of net prior service cost (credit) | — |
| | — |
| | — |
| | (25 | ) | | (4 | ) | | — |
| Settlement expense (1) | 146 |
| | 11 |
| | — |
| | — |
| | — |
| | — |
| Termination benefits expense (1) | 44 |
| | — |
| | — |
| | — |
| | — |
| | — |
| Curtailment expense (1) | 8 |
| | — |
| | — |
| | — |
| | — |
| | — |
| Net periodic benefit cost | $ | 337 |
| | $ | 173 |
| | $ | 126 |
| | $ | (10 | ) | | $ | 20 |
| | $ | 15 |
|
__________________________________________________________________ | | (1) | During 2016, settlement expenses, termination benefits expense, and curtailment expense primarily relate to the workforce reduction program initiated in the first quarter of 2016. See Note 17—Restructuring Charges. |
|
Schedule of Amounts Recognized in Other Comprehensive Income | The following summarizes the amounts recognized in other comprehensive income (before tax benefit) for the years ended December 31: | | | | | | | | | | | | | | | | | | | | | | | | | | Pension Benefits | | Other Benefits | millions | 2016 | | 2015 | | 2014 | | 2016 | | 2015 | | 2014 | Amounts recognized in other comprehensive income (expense) | | | | | | | | | | | | Net actuarial gain (loss) | $ | (150 | ) | | $ | 22 |
| | $ | (333 | ) | | $ | (25 | ) | | $ | 27 |
| | $ | (72 | ) | Amortization of net actuarial (gain) loss | 188 |
| | 63 |
| | 34 |
| | — |
| | — |
| | (7 | ) | Net prior service (cost) credit | — |
| | — |
| | — |
| | — |
| | 89 |
| | — |
| Amortization of net prior service cost (credit) | — |
| | — |
| | — |
| | (34 | ) | | (4 | ) | | — |
| Total amounts recognized in other comprehensive income (expense) | $ | 38 |
| | $ | 85 |
| | $ | (299 | ) | | $ | (59 | ) | | $ | 112 |
| | $ | (79 | ) |
|
Schedule of Assumptions Used | The following summarizes the weighted-average assumptions used by the Company in determining the pension and other postretirement benefit obligations and net periodic benefit cost for the years ended December 31: | | | | | | | | | | | | | | | | | | | | Pension Benefits | | Other Benefits | | 2016 | | 2015 | | 2014 | | 2016 | | 2015 | | 2014 | Benefit obligation assumptions | | | | | | | | | | | | Discount rate | 4.06 | % | | 4.50 | % | | 4.00 | % | | 4.26 | % | | 5.00 | % | | 4.25 | % | Rates of increase in compensation levels | 5.40 | % | | 5.25 | % | | 5.25 | % | | 5.48 | % | | 5.50 | % | | 5.25 | % | Net periodic benefit cost assumptions | | | | | | | | | | | | Discount rate | 4.62 | % | | 4.00 | % | | 4.75 | % | | 5.00 | % | | 4.25 | % | | 5.25 | % | Long-term rate of return on plan assets | 6.77 | % | | 6.75 | % | | 6.75 | % | | N/A |
| | N/A |
| | N/A |
| Rates of increase in compensation levels | 5.34 | % | | 5.25 | % | | 5.00 | % | | 5.41 | % | | 5.25 | % | | 5.25 | % |
|
Fair Value Hierarchy of Plan Assets Table | The fair value of the Company’s pension plan assets by asset class and input level within the fair-value hierarchy were as follows: | | | | | | | | | | | | | | | | | millions | | | | | | | | December 31, 2016 | Level 1 | | Level 2 | | Level 3 (3) | | Total | Investments | | | | | | | | Cash and cash equivalents | $ | 2 |
| | $ | — |
| | $ | — |
| | $ | 2 |
| Fixed income | | | | | | | | Mortgage-backed securities | — |
| | 1 |
| | — |
| | 1 |
| Other fixed-income securities | 59 |
| | 32 |
| | — |
| | 91 |
| Equity securities | | | | | | | | Domestic | 248 |
| | — |
| | — |
| | 248 |
| International | 99 |
| | — |
| | — |
| | 99 |
| Other | | | | | | | | Real estate | — |
| | — |
| | 10 |
| | 10 |
| Other | — |
| | 28 |
| | — |
| | 28 |
| Investments measured at net asset value (1) | — |
| | — |
| | — |
| | 861 |
| Total investments (2) | $ | 408 |
| | $ | 61 |
| | $ | 10 |
| | $ | 1,340 |
| | | | | | | | | December 31, 2015 | | | | | | | | Investments | | | | | | | | Cash and cash equivalents | $ | 5 |
| | $ | — |
| | $ | — |
| | $ | 5 |
| Fixed income | | | | | | | | Mortgage-backed securities | — |
| | 1 |
| | — |
| | 1 |
| U.S. government securities | — |
| | 1 |
| | — |
| | 1 |
| Other fixed-income securities | 46 |
| | 32 |
| | — |
| | 78 |
| Equity securities | | | | | | | | Domestic | 330 |
| | — |
| | — |
| | 330 |
| International | 130 |
| | — |
| | — |
| | 130 |
| Other | | | | | | | | Real estate | — |
| | — |
| | 13 |
| | 13 |
| Hedge funds | 7 |
| | — |
| | — |
| | 7 |
| Other | — |
| | 30 |
| | — |
| | 30 |
| Investments measured at net asset value (1) | — |
| | — |
| | — |
| | 1,081 |
| Total investments (2) | $ | 518 |
| | $ | 64 |
| | $ | 13 |
| | $ | 1,676 |
| Liabilities | | | | | | | | Hedge funds | $ | (3 | ) | | $ | — |
| | $ | — |
| | $ | (3 | ) | Total liabilities | $ | (3 | ) | | $ | — |
| | $ | — |
| | $ | (3 | ) |
__________________________________________________________________ | | (1) | Certain investments measured at fair value using the net asset value per share (or its equivalent) have not been categorized in the fair value hierarchy. Amounts presented in this table are intended to reconcile the fair value hierarchy to the pension plan assets. |
| | (2) | Amount excludes receivables and payables, primarily related to Level 1 investments. |
| | (3) | The changes in level 3 investments of $(3) million for the year ended December 31, 2016, and $1 million for the year ended December 31, 2015, were attributable to the actual return on plan assets still held at the reporting date. |
|
Schedule Of Estimated Future and Current Year Employer Contributions | The following summarizes the Company’s contributions for 2016 and expected contributions for 2017: | | | | | | | | | millions | Expected 2017 | | 2016 | Funded pension plans | $ | 140 |
| | $ | 3 |
| Unfunded pension plans | 67 |
| | 98 |
| Unfunded other postretirement plans | 24 |
| | 19 |
| Total | $ | 231 |
| | $ | 120 |
|
|
Schedule of Estimated Future Benefit Payments | The following summarizes estimated benefit payments for the next 10 years, including benefit increases due to continuing employee service: | | | | | | | | | millions | Pension Benefit Payments | | Other Benefit Payments | 2017 | $ | 302 |
| | $ | 24 |
| 2018 | 147 |
| | 20 |
| 2019 | 166 |
| | 20 |
| 2020 | 164 |
| | 20 |
| 2021 | 171 |
| | 19 |
| 2022-2026 | 1,009 |
| | 93 |
|
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