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Financial Instruments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
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 $ 0 $ 0 103 $ 0  
Interest rate contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, aggregate notional value 4,250   4,250   $ 5,250
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     $ 19    
Hedged forecasted transaction period     4 years 3 months    
Net investment hedge contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, aggregate notional value 6,909   $ 6,909   $ 6,864
Net investment hedge contracts | Net investment hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, aggregate notional value $ 6,900   $ 6,900