Income Taxes - PAC - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Components of Income Tax Expense (Benefit) [Line Items]
Years eligible for renewable energy production tax credit	10 years
Production tax credits	$ 1,700	$ 1,400	$ 1,200
PAC
Components of Income Tax Expense (Benefit) [Line Items]
Years eligible for renewable energy production tax credit	10 years
Production tax credits	$ 185	164	89
Effective income tax reconciliation, amortization of excess deferred income taxes	$ 102	112	132
PAC | State
Components of Income Tax Expense (Benefit) [Line Items]
Effective income tax reconciliation, amortization of excess deferred income taxes		$ 4	$ 118