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Derivative Instruments (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 30, 2020
EUR (€)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
EUR (€)
Jul. 31, 2019
EUR (€)
Nov. 30, 2018
EUR (€)
Derivative Instruments, Gain (Loss) [Line Items]                
Repayments of long-term debt $ 2,297 $ 1,342 $ 669          
Debt instrument, repurchased face amount | €       € 300,000,000        
Foreign currency exchange forward contracts                
Derivative Instruments, Gain (Loss) [Line Items]                
Notional amount 8,159 8,088            
Designated as Hedging Instrument | Foreign currency exchange forward contracts                
Derivative Instruments, Gain (Loss) [Line Items]                
Notional amount 1,828 $ 1,113   € 500,000,000   € 2,400,000,000 € 1,000,000,000.0 € 2,250,000,000
Fair value of designated net investment hedges (386)              
Gains on derivatives designated as hedges (2)              
Designated as Hedging Instrument | Interest rate swap                
Derivative Instruments, Gain (Loss) [Line Items]                
Notional amount 750              
Gains on derivatives designated as hedges 6              
Derivative notional amount terminated         $ 500 € 600,000,000    
Pretax gains recorded in AOCI $ (53)