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Financial Instruments - Fair Values of Derivatives (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Derivative assets $ 160 $ 73
Derivative liabilities 139 121
Derivatives designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Derivative assets 144 61
Derivative liabilities 108 98
Derivatives designated as hedging instruments | Interest rate derivatives    
Derivatives, Fair Value [Line Items]    
Derivative assets 77 44
Derivative liabilities 46 29
Derivatives designated as hedging instruments | Foreign currency contracts    
Derivatives, Fair Value [Line Items]    
Derivative assets 67 17
Derivative liabilities 62 69
Derivatives not designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Derivative assets 16 12
Derivative liabilities 31 23
Derivatives not designated as hedging instruments | Interest rate derivatives    
Derivatives, Fair Value [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Derivatives not designated as hedging instruments | Foreign currency contracts    
Derivatives, Fair Value [Line Items]    
Derivative assets 16 12
Derivative liabilities $ 31 $ 23