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Derivative and Hedging Activities - Derivative Instruments in Balance Sheet Table (Details) - Not designated as hedging instrument - Commodity contract - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Derivative asset (liability), fair value, gross asset (liability) $ (1,610) $ (118)
Derivative asset (liability) fair value, net asset (liability), netted 0 0
Derivative assets (liabilities), at fair value, net (1,610) (118)
Short-term derivative asset    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value, gross asset 14 84
Derivative asset, fair value, gross liability, netted (14) (65)
Derivative asset 0 19
Long-term derivative asset    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value, gross asset 7 5
Derivative asset, fair value, gross liability, netted (7) (5)
Derivative asset 0 0
Short-term derivative liability    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value, gross liability (1,359) (158)
Derivative liability, fair value, gross asset, netted 14 65
Derivative liability (1,345) (93)
Long-term derivative liability    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value, gross liability (272) (49)
Derivative liability, fair value, gross asset, netted 7 5
Derivative liability $ (265) $ (44)