Income Taxes (Interest and Penalties) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Line Items]
Tax settlement increase (decrease) on earnings	$ 146	$ 146
Tax refund	60
Accrued interest and penalties			$ 52
Net after-tax interest and penalties tax (benefit) expense		(41)	4	$ 4
SCE
Income Tax Disclosure [Line Items]
Tax settlement increase (decrease) on earnings	36	36
Accrued interest and penalties	$ 20	20	23
Net after-tax interest and penalties tax (benefit) expense		$ (2)	$ 6	$ 3