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Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]      
Pre-tax loss on interest rate swaps included in interest and other expense, net $ 0 $ 103  
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  
Derivative, aggregate notional value 4,720   $ 4,551
Net investment hedge contracts | Net investment hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, aggregate notional value 4,700    
Interest rate contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, aggregate notional value 3,500   $ 3,500
Interest rate contracts | Cash flow hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Expected transfer of unrealized losses (net of taxes) for interest rate cash flow hedges to earnings during the next 12 months $ 113    
Hedged forecasted transaction period 3 years 6 months