Supplemental Cash Flows Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash payments for interest and taxes:
Interest, net of amounts capitalized	$ 240	$ 228
Tax payments, net of refunds	14	12
Common stock
Dividends declared but not paid:
Dividends declared but not paid	177	156
Preferred and preference stock
Dividends declared but not paid:
Dividends declared but not paid	12	12
Southern California Edison
Cash payments for interest and taxes:
Interest, net of amounts capitalized	223	221
Tax payments, net of refunds	20	32
Dividends declared but not paid:
Accrued capital expenditures	283	338
Southern California Edison | Common stock
Dividends declared but not paid:
Dividends declared but not paid	0	0
Southern California Edison | Preferred and preference stock
Dividends declared but not paid:
Dividends declared but not paid	$ 12	$ 12