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Financial Instruments - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]          
Net loss on equity method investment transactions $ 25,000,000 $ 0 $ 2,000,000 $ 0  
Loss/(gain) related to interest rate swaps 0 (5,000,000) 0 9,000,000  
Cash flow hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Net derivative gains/(losses) (74,000,000) 21,000,000 (143,000,000) (11,000,000)  
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings (12,000,000) (5,000,000) (12,000,000) 9,000,000  
Interest rate contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, aggregate notional value 7,661,000,000   7,661,000,000   $ 8,679,000,000
Interest rate contracts | Cash flow hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Expected transfers of unrealized losses to earnings, within next 12 months or less     $ 89,000,000    
Hedged forecasted transaction period     4 years 4 months    
Net derivative gains/(losses) (77,000,000) 21,000,000 $ (146,000,000) (11,000,000)  
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings (12,000,000) (5,000,000) (12,000,000) 9,000,000  
Net investment hedge contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, aggregate notional value 6,931,000,000   6,931,000,000   $ 6,678,000,000
Net derivative gains/(losses) 60,000,000 276,000,000 74,000,000 265,000,000  
After-tax gains/(losses) on contracts settled recorded in cumulative translation adjustment of other comprehensive income (7,000,000)        
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings 0 0 0 0  
Net investment hedge contracts | Net investment hedge debt          
Derivative Instruments, Gain (Loss) [Line Items]          
Gains (losses), net of taxes, recognized in income, excluded from effectiveness testing 34,000,000 $ 33,000,000 67,000,000 $ 50,000,000  
Reclassification out of Accumulated Other Comprehensive Income          
Derivative Instruments, Gain (Loss) [Line Items]          
Net loss on equity method investment transactions $ 12,000,000   $ 12,000,000