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Derivative Instruments - Change in Unrealized (Losses) Gains in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Net unrealized gains on cash flow hedges, net of taxes, beginning of period     $ 628  
Change in fair value, net of tax   $ (3)   $ (6)
Net unrealized gains (losses) on cash flow hedges, net of taxes, end of period $ 346   346  
Unrealized Gain (Loss) on Foreign Forward Exchange Contracts        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Net unrealized gains on cash flow hedges, net of taxes, beginning of period 4 (1) 4 2
Change in fair value, net of tax (3) (5) 1 (9)
Reclassification into earnings, net of tax 0 2 (4) 3
Net unrealized gains (losses) on cash flow hedges, net of taxes, end of period $ 1 $ (4) $ 1 $ (4)