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Financial Instruments, Derivatives and Hedging Activities - CF Hedges in AOCI (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive income (loss) $ (1,259) $ (1,158)
Cash Flow Hedging    
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive income (loss) (5) (9)
Cash Flow Hedging | Commodity Contracts    
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive income (loss) 2 (11)
Tax effect on gains (losses) of derivative instruments   5
Cash Flow Hedging | Foreign Currency Contracts    
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive income (loss) (3) 3
Tax effect on gains (losses) of derivative instruments 1 (1)
Cash Flow Hedging | Interest Rate Contracts    
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive income (loss) (4) $ (1)
Tax effect on gains (losses) of derivative instruments $ 1