Derivative and Hedging Activities - Derivative Instruments in Balance Sheet (Details) - Not designated as hedging instrument - Commodity contracts - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset		$ (118)
Derivative liability, fair value, gross liability	$ (1,143)
Derivative liability, fair value, gross asset	0	0
Total derivatives	(1,143)	(118)
Short-term derivative asset
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	56	84
Derivative asset, fair value, gross liability	(51)	(65)
Total derivatives	5	19
Long-term derivative asset
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset		5
Derivative asset, fair value, gross liability		(5)
Total derivatives		0
Short-term derivative liability
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability	(950)	(158)
Derivative liability, fair value, gross asset	51	65
Total derivatives	(899)	(93)
Long-term derivative liability
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross liability	(249)	(49)
Derivative liability, fair value, gross asset	0	5
Total derivatives	$ (249)	$ (44)