Risk Management and Hedging Activities - PAC - Balance Sheet Location (Details) - PAC - Commodity derivatives - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (76)	$ 270
Cash collateral receivable (payable)	10	(78)
Total derivatives - net basis	(66)	192
Cash collateral payable, not offset		12
Other current assets
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	18	257
Cash collateral receivable (payable)	(2)	(73)
Total derivatives - net basis	16	184
Other non-current assets
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	2	20
Cash collateral receivable (payable)	0	(5)
Total derivatives - net basis	2	15
Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(76)	(5)
Cash collateral receivable (payable)	12	0
Total derivatives - net basis	(64)	(5)
Other long-term liabilities
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(20)	(2)
Cash collateral receivable (payable)	0	0
Total derivatives - net basis	(20)	(2)
Not designated as hedging contracts
Derivatives, Fair Value [Line Items]
Derivative asset, not subject to master netting arrangement	32	318
Derivative liability, not subject to master netting arrangement	(108)	(48)
Derivative, fair value, net	(76)	270
Net regulatory asset (liability) on derivative contracts	76	(270)	$ (53)	$ 17
Not designated as hedging contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, not subject to master netting arrangement	21	279
Derivative liability, not subject to master netting arrangement	(3)	(22)
Derivative, fair value, net	18	257
Not designated as hedging contracts | Other non-current assets
Derivatives, Fair Value [Line Items]
Derivative asset, not subject to master netting arrangement	2	27
Derivative liability, not subject to master netting arrangement	0	(7)
Derivative, fair value, net	2	20
Not designated as hedging contracts | Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative asset, not subject to master netting arrangement	7	9
Derivative liability, not subject to master netting arrangement	(83)	(14)
Derivative, fair value, net	(76)	(5)
Not designated as hedging contracts | Other long-term liabilities
Derivatives, Fair Value [Line Items]
Derivative asset, not subject to master netting arrangement	2	3
Derivative liability, not subject to master netting arrangement	(22)	(5)
Derivative, fair value, net	$ (20)	$ (2)