Supplemental Cash Flows Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash payments:
Interest, net of amounts capitalized	$ 233	$ 200
Tax refunds, net	0	0
Common Stock
Dividends declared but not paid:
Dividends declared but not paid:	232	200
Preferred and preference stock
Dividends declared but not paid:
Dividends declared but not paid:	0	1
Southern California Edison
Cash payments:
Interest, net of amounts capitalized	210	177
Tax refunds, net	0	0
Dividends declared but not paid:
Accrued capital expenditures	451	392
Southern California Edison | Common Stock
Dividends declared but not paid:
Dividends declared but not paid:	0	200
Southern California Edison | Preferred and preference stock
Dividends declared but not paid:
Dividends declared but not paid:	$ 0	$ 1