Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0000315293 (http://www.sec.gov/CIK)

Other Financial Data [Abstract]	Period [Axis]
	2016-01-01 - 2016-12-31
Other Financial Data [Abstract]
Other income (Expense)	Other income consists of the following (in millions): Years ended December 31 2016   2015   2014 Equity earnings $ 13   $ 13   $ 12 Net gain on disposals of businesses 39   82   24 Foreign currency remeasurement (loss) gain (2 )   30   18 (Loss) income on financial instruments (14 )   (24 )   (15 ) Other —   (1 )   5 Total $ 36   $ 100   $ 44
Schedule of Allowance for Doubtful Accounts	An analysis of the allowance for doubtful accounts is as follows (in millions): Years ended December 31 2016   2015   2014 Balance at January 1 $ 58   $ 74   $ 90 Provision charged to operations 11   13   12 Accounts written off, net of recoveries (14 )   (34 )   (33 ) Foreign currency translation 3   5   5 Balance at December 31 $ 58   $ 58   $ 74
Schedule of Other Current Assets	The components of Other current assets are as follows (in millions): As of December 31 2016   2015 Taxes receivable $ 100   $ 94 Prepaid expenses 125   130 Deferred project costs 87   92 Other 39   13 Total $ 351   $ 329
Components of Fixed assets, net	The components of Fixed assets, net are as follows (in millions): As of December 31 2016   2015 Software $ 948   $ 1,095 Leasehold improvements 452   422 Computer equipment 417   358 Furniture, fixtures and equipment 300   315 Construction in progress 93   76 Other 115   115 Fixed assets, gross 2,325   2,381 Less: Accumulated depreciation 1,560   1,616 Fixed assets, net $ 765   $ 765
Schedule of Other Non-current Assets	The components of Other non-current assets are as follows (in millions): As of December 31 2016   2015 Deferred project costs $ 183   $ 210 Investments 119   135 Taxes receivable 82   82 Other 170   165 Total $ 554   $ 592
Schedule of Other Current Liabilities	The components of Other current liabilities are as follows (in millions): As of December 31 2016   2015 Deferred revenue $ 393   $ 394 Taxes payable 78   94 Other 402   331 Total $ 873   $ 819
Schedule of Other Non-current Liabilities	The components of Other non-current liabilities are as follows (in millions): As of December 31 2016   2015 Taxes payable $ 288   $ 223 Leases 169   166 Deferred revenue 140   159 Compensation and benefits 56   59 Other 191   162 Total $ 844   $ 769