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Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 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 $ 0   $ 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   79  
Pre-tax loss on interest rate swaps included in interest and other expense, net     $ 103   $ 103  
Derivative, aggregate notional value 3,914     3,914   $ 4,551
Net investment hedge contracts | Net investment hedges            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, aggregate notional value 3,900     3,900    
Interest rate contracts            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, aggregate notional value $ 1,850     1,850   $ 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       $ 35    
Hedged forecasted transaction period       4 years 11 months