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Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 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 4,623   4,623   $ 4,551
Net investment hedge contracts | Net investment hedges          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, aggregate notional value 4,600   4,600    
Interest rate contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, aggregate notional value $ 3,500   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     $ 134    
Hedged forecasted transaction period     3 years 3 months