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Financial Instruments - Additional Information (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
derivate
Mar. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
derivate
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]          
Gains (losses) related to interest rate swaps     $ 10,000,000 $ 0 $ (97,000,000)
Borrowings          
Derivative Instruments, Gain (Loss) [Line Items]          
Carrying amount of hedged fixed interest rate debt $ 0   0 801,000,000  
Cash Flow Hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Net derivatives gains/(losses)     (45,000,000) (19,000,000) (129,000,000)
Gains/(losses) reclassified from accumulated other comprehensive income into earnings     $ 9,000,000 (27,000,000) (53,000,000)
Cash Flow Hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Hedged forecasted transaction period     4 years 10 months    
Interest rate contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, aggregate notional value 8,679,000,000   $ 8,679,000,000 6,532,000,000  
Interest rate contracts | Cash Flow Hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Gains (losses) related to interest rate swaps   $ (97,000,000)      
Expected transfers of unrealized losses to earnings, within next 12 months     106,000,000    
Net derivatives gains/(losses)     (45,000,000) 12,000,000 (103,000,000)
Gains/(losses) reclassified from accumulated other comprehensive income into earnings     9,000,000 0 $ (48,000,000)
Net investment hedge contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, aggregate notional value $ 6,678,000,000   6,678,000,000 $ 0  
Net derivatives gains/(losses)     207,000,000    
After-tax gain on net investment contracts settled recorded as cumulative translation adjustment in other comprehensive income     191,000,000    
Gains/(losses) reclassified from accumulated other comprehensive income into earnings     0    
Net investment hedge contracts | Net Investment Hedging          
Derivative Instruments, Gain (Loss) [Line Items]          
Gains (losses), net of taxes, recognized in income, excluded from effectiveness testing     $ 120,000,000    
Cross Currency Interest Rate Contract          
Derivative Instruments, Gain (Loss) [Line Items]          
Number of derivative contracts matured or settled | derivate 6   6    
Cash proceeds received on derivative instruments $ 127,000,000        
Foreign Exchange Forward          
Derivative Instruments, Gain (Loss) [Line Items]          
Number of derivative contracts matured or settled | derivate 8   8    
Cash proceeds received on derivative instruments     $ 152,000,000