Supplemental Cash Flows Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash payments (receipts):
Interest, net of amounts capitalized	$ 728	$ 689
Income taxes, net	(87)	(30)
Common Stock
Non-cash financing and investing activities:
Dividends declared but not paid	252	241
SCE
Cash payments (receipts):
Interest, net of amounts capitalized	642	607
Income taxes, net	(87)	(29)
Non-cash financing and investing activities:
Accrued capital expenditures	567	490
SCE | Common Stock
Non-cash financing and investing activities:
Dividends declared but not paid	$ 325	$ 0