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Financial Instruments, Derivatives and Hedging Activities - CF Hedges in AOCI (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive income (loss) $ (877) $ (1,133)
Cash Flow Hedging [Member]    
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive income (loss) 72 42
Cash Flow Hedging [Member] | Commodity Contract [Member]    
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive income (loss) 77 47
Tax effect on gains (losses) of derivative instruments (27) (16)
Cash Flow Hedging [Member] | Foreign Currency Contracts    
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive income (loss) (1) (1)
Cash Flow Hedging [Member] | Interest Rate Contract [Member]    
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive income (loss) (4) (4)
Tax effect on gains (losses) of derivative instruments $ 1 $ 1