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Financial Instruments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]            
Pre-tax loss on interest rate swaps included in interest and other expense, net $ 0   $ 111 $ 103 $ 111  
Net investment hedge contracts            
Derivative Instruments, Gain (Loss) [Line Items]            
After-tax loss on interest rate swaps included in interest and other expense, net   $ 79        
Pre-tax loss on interest rate swaps included in interest and other expense, net   $ 103 $ 111   $ 111  
Derivative, aggregate notional value 6,168     6,168   $ 6,864
Net investment hedge contracts | Net investment hedges            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, aggregate notional value 6,200     6,200    
Interest rate contracts            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, aggregate notional value $ 3,500     3,500   $ 5,250
Interest rate contracts | Cash flow hedges            
Derivative Instruments, Gain (Loss) [Line Items]            
Expected transfer of unrealized losses for interest rate cash flow hedges to earnings during the next 12 months       $ 20    
Hedged forecasted transaction period       4 years