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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)

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