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Derivative Instruments and Hedging Activities (Assets and LIabilities - Designated vs. Not Designated Hedging Instruments) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Total asset derivatives $ 189 $ 171
Total liability derivatives 679 424
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 60 62
Total liability derivatives 518 368
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 129 109
Total liability derivatives 161 56
Interest Rate Contract    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 13 31
Total liability derivatives 610 328
Interest Rate Contract | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 13 31
Total liability derivatives 506 323
Interest Rate Contract | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 0 0
Total liability derivatives 104 5
Cross Currency Interest Rate Contract [Member]    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 5 0
Total liability derivatives 4 21
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 5 0
Total liability derivatives 4 21
Cross Currency Interest Rate Contract [Member] | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 0 0
Total liability derivatives 0 0
Foreign Exchange Contract [Member]    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 161 110
Total liability derivatives 43 44
Foreign Exchange Contract [Member] | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 40 31
Total liability derivatives 8 22
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 121 79
Total liability derivatives 35 22
Commodity Contract [Member]    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 10 30
Total liability derivatives 22 31
Commodity Contract [Member] | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 2 0
Total liability derivatives 0 2
Commodity Contract [Member] | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 8 30
Total liability derivatives 22 29
Other Noncurrent Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Noncurrent 138 99
Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Current $ 51 $ 72