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Derivative Instruments - Change in Unrealized (Losses) Gains in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Net unrealized gains (losses) on cash flow hedges, net of taxes, beginning of period     $ 650  
Net unrealized gains on cash flow hedges, net of taxes, end of period $ 1,019   1,019  
Unrealized Gain (Loss) on Forward Exchange Contracts        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Net unrealized gains (losses) on cash flow hedges, net of taxes, beginning of period 7 $ 2 2 $ (1)
Change in fair value, net of tax (3) 0 3 4
Reclassification into earnings, net of tax (3) (1) (4) (2)
Net unrealized gains on cash flow hedges, net of taxes, end of period $ 1 $ 1 $ 1 $ 1