Commodity and Other Derivative Contractual Assets and Liabilities - Schedule of Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative assets: amounts presented in balance sheet	$ 4,208	$ 5,227
Derivative assets: offsetting financial instruments	(3,547)	(4,544)
Derivative assets: financial collateral (received) pledged	(26)	(20)
Derivative assets: net amounts	635	663
Derivative liabilities: amounts presented in balance sheet	(6,932)	(8,323)
Derivative liabilities: offsetting financial instruments	3,547	4,544
Derivative liabilities: financial collateral (received) pledged	970	1,675
Derivative liabilities: net amounts	(2,415)	(2,104)
Derivative, fair value, net	(2,724)	(3,096)
Derivative (assets) liability, fair value of collateral, net	944	1,655
Derivative assets (liability), fair value, amount offset against collateral	(1,780)	(1,441)
Commodity contracts
Derivatives, Fair Value [Line Items]
Derivative assets: amounts presented in balance sheet	4,144	5,092
Derivative assets: offsetting financial instruments	(3,519)	(4,480)
Derivative assets: financial collateral (received) pledged	(26)	(20)
Derivative assets: net amounts	599	592
Derivative liabilities: amounts presented in balance sheet	(6,884)	(8,240)
Derivative liabilities: offsetting financial instruments	3,519	4,480
Derivative liabilities: financial collateral (received) pledged	970	1,675
Derivative liabilities: net amounts	(2,395)	(2,085)
Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative assets: amounts presented in balance sheet	64	135
Derivative assets: offsetting financial instruments	(28)	(64)
Derivative assets: financial collateral (received) pledged	0	0
Derivative assets: net amounts	36	71
Derivative liabilities: amounts presented in balance sheet	(48)	(83)
Derivative liabilities: offsetting financial instruments	28	64
Derivative liabilities: financial collateral (received) pledged	0	0
Derivative liabilities: net amounts	$ (20)	$ (19)

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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