Derivative and Hedging Activities - Derivative Instruments in Balance Sheet Table (Details) - Not designated as hedging instrument - Commodity contract - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative asset (liability), fair value, gross asset (liability)	$ (3,022)	$ (1,143)
Derivative asset (liability) fair value, net asset (liability), netted	0	0
Derivative assets (liabilities), at fair value, net	(3,022)	(1,143)
Short-term derivative asset
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	34	56
Derivative asset, fair value, gross liability, netted	(33)	(51)
Derivative asset	1	5
Long-term derivative asset
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	22
Derivative asset, fair value, gross liability, netted	(14)
Derivative asset	8
Short-term derivative liability
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability	(2,671)	(950)
Derivative liability, fair value, gross asset, netted	33	51
Derivative liability	(2,638)	(899)
Long-term derivative liability
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability	(407)	(249)
Derivative liability, fair value, gross asset, netted	14	0
Derivative liability	$ (393)	$ (249)