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Financial Instruments, Derivatives and Hedging Activities - CF Hedges in AOCI (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive income (loss) $ (1,106) $ (1,133)
Cash Flow Hedging    
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive income (loss) 91 42
Cash Flow Hedging | Commodity Contracts    
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive income (loss) 97 47
Tax effect on gains (losses) of derivative instruments (33) (16)
Cash Flow Hedging | Foreign Currency Contracts    
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive income (loss) (2) (1)
Cash Flow Hedging | Interest Rate Contracts    
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive income (loss) (4) (4)
Tax effect on gains (losses) of derivative instruments $ 1 $ 1