Variable Interest Entities (Income Statement) (Details) - SCE - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Trust II
Variable Interest Entity [Line Items]
Dividend income	$ 5	$ 5
Dividend distributions		5
Trust III
Variable Interest Entity [Line Items]
Dividend income	4	4
Dividend distributions		4
Trust IV
Variable Interest Entity [Line Items]
Dividend income	4	4
Dividend distributions		4
Trust V
Variable Interest Entity [Line Items]
Dividend income	4	4
Dividend distributions		4
Trust VI
Variable Interest Entity [Line Items]
Dividend income	$ 6	6
Dividend distributions		$ 6