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Financial Instruments, Derivatives and Hedging Activities - CF Hedges in AOCI (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive loss $ (1,158) $ (1,154)
Commodity Contracts    
Accumulated Other Comprehensive Loss.    
Tax effect on gains (losses) of derivative instruments 5 2
Cash Flow Hedging    
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive loss (9) (4)
Cash Flow Hedging | Commodity Contracts    
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive loss (11) (2)
Cash Flow Hedging | Foreign Currency Contracts    
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive loss 3  
Tax effect on gains (losses) of derivative instruments (1)  
Cash Flow Hedging | Interest Rate Contracts    
Accumulated Other Comprehensive Loss.    
Accumulated other comprehensive loss $ (1) (2)
Tax effect on gains (losses) of derivative instruments   $ 1