Income Taxes - PAC (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Effective income tax rate	(24.00%)	5.00%	(21.00%)	(13.00%)
Income tax expense (benefit)	$ 255	$ (149)	$ 417	$ 358
Pre-tax loss	$ (1,049)	$ (3,249)	$ (2,028)	$ (2,779)
Federal statutory income tax rate	21.00%	21.00%	21.00%	21.00%
Income tax credits	(34.00%)	(13.00%)	(35.00%)	(28.00%)
Effects of ratemaking	(3.00%)	(1.00%)	(3.00%)	(2.00%)
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	21.00%	21.00%	21.00%
State income tax, net of federal income tax impacts	0.00%	(1.00%)	(2.00%)	0.00%
Income tax credits	(34.00%)	(13.00%)	(35.00%)	(28.00%)
Effects of ratemaking	(3.00%)	(1.00%)	(3.00%)	(2.00%)
Other	0.00%	1.00%	0.00%	0.00%
Effective income tax rate	(24.00%)	5.00%	(21.00%)	(13.00%)
Years eligible for federal renewable energy production tax credit			10 years
Production tax credits			$ 700	$ 734
Related party transaction, cash received (paid) for income taxes			$ 864	$ 1,249
PAC
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Effective income tax rate	(39.00%)	(11.00%)	91.00%	(3.00%)
Income tax expense (benefit)	$ 30	$ 8	$ 140	$ 6
Pre-tax loss	$ (76)	$ (74)	154	$ (206)
Federal statutory income tax rate, benefit			$ 32
Federal statutory income tax rate	21.00%	21.00%	21.00%	21.00%
Income tax credit benefit			$ 55
Income tax credits	(34.00%)	(25.00%)	36.00%	(21.00%)
Effects of ratemaking, benefit			$ 34
Effects of ratemaking	(26.00%)	(13.00%)	22.00%	(11.00%)
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	21.00%	21.00%	21.00%
State income tax, net of federal income tax impacts	2.00%	4.00%	4.00%	3.00%
Income tax credits	(34.00%)	(25.00%)	36.00%	(21.00%)
Effects of ratemaking	(26.00%)	(13.00%)	22.00%	(11.00%)
Valuation allowance	0.00%	0.00%	7.00%	4.00%
Other	(2.00%)	2.00%	1.00%	1.00%
Effective income tax rate	(39.00%)	(11.00%)	91.00%	(3.00%)
Years eligible for federal renewable energy production tax credit			10 years
Production tax credits	$ 26	$ 18	$ 55	$ 44
Income taxes payable	55		55
Income taxes receivable					$ 84
Related party transaction, cash received (paid) for income taxes			205	150
PAC \| 2020 Wildfires
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Loss contingency, loss in period	$ 49	$ 64	408	64
PAC \| State
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Valuation allowance increase (decrease)			$ (11)	$ 8

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the tax effect of certain temporary differences due to state utility rate regulation.

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Renewable Energy Production Tax Credits recognized during the period.

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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