Supplemental Cash Flows Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Cash payments for interest and taxes
Interest, net of amounts capitalized		$ 228	$ 230
Tax payments, net		12	3
Convertible Debt [Abstract]
Pollution-control bonds redeemed (2.875%)		0	(203)
Pollution-control bonds issued (1.875%)		0	203
Common stock
Dividends declared but not paid
Dividends declared but not paid	$ 136	156	136
Preferred and preference stock
Dividends declared but not paid
Dividends declared but not paid	18	12	18
Southern California Edison
Cash payments for interest and taxes
Interest, net of amounts capitalized		221	222
Tax payments, net		32	125
Convertible Debt [Abstract]
Pollution-control bonds redeemed (2.875%)		0	(203)
Pollution-control bonds issued (1.875%)		0	203
Accrued capital expenditures		338	393
Reduction in lease obligation	147
Southern California Edison | Common stock
Dividends declared but not paid
Dividends declared but not paid	147	0	147
Southern California Edison | Preferred and preference stock
Dividends declared but not paid
Dividends declared but not paid	$ 18	$ 12	$ 18
2.875% Pollution-Control Bonds
Convertible Debt [Abstract]
Interest rate on converted debt		2.875%	2.875%
2.875% Pollution-Control Bonds | Southern California Edison
Convertible Debt [Abstract]
Interest rate on converted debt		2.875%	2.875%
1.875% Pollution-Control Bonds Due in 2029
Convertible Debt [Abstract]
Interest rate on converted debt		1.875%	1.875%
1.875% Pollution-Control Bonds Due in 2029 | Southern California Edison
Convertible Debt [Abstract]
Interest rate on converted debt		1.875%	1.875%