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Income Taxes (Schedule of Unresolved Income Tax Positions) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Balance at beginning of year $ 313 $ 315    
Increases related to current year income tax positions 47 21    
Increases related to prior year income tax positions 22 3    
Settlements and resolutions of income tax audits (82) (9)    
Statute of limitations expirations (9) (6)    
Foreign currency translation (4) (11)    
Balance at end of year 287 313    
Current liabilities—Income taxes     $ 0 $ 9
Noncurrent liabilities—Other liabilities     287 304
Balance at end of year $ 313 $ 315 $ 287 $ 313