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Financial Instruments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]            
(Losses) gains related to interest rate swaps $ (111)   $ 1 $ (111) $ 10  
Net loss on equity method investment transactions 0 $ 12 (757) 2 $ (757)  
Net investment hedge contracts            
Derivative Instruments, Gain (Loss) [Line Items]            
(Losses) gains related to interest rate swaps     $ 1      
Derivative, aggregate notional value 6,651     6,651   $ 6,678
Net investment hedge contracts | Net investment hedges            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, aggregate notional value 6,700     6,700    
Interest rate contracts            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, aggregate notional value $ 6,500     6,500   $ 8,679
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       $ 6    
Hedged forecasted transaction period       4 years 10 months 24 days