Interest and Other Income and Expenses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Other income:
Interest and other income	$ 46	$ 34	$ 69	$ 63
Other expenses:
Total consolidated other expenses	16	14	23	21
Southern California Edison
Other income:
Equity allowance for funds used during construction	16	18	31	39
Increase in cash surrender value of life insurance policies	12	7	18	14
Interest income	3	4	5	6
Other	1	1	1	2
Total interest and other income	46	30	69	61
Interest and other income	46	30	69	61
Other expenses:
Civic, political and related activities and donations	9	9	13	15
Other	6	5	10	6
Total other expenses	15	14	23	21
Total consolidated other expenses	15	14	23	21
Southern California Edison | FERC-Approved Settlement Agreements
Other Income And Expense [Line Items]
Litigation Settlement, Amount	208
Litigation Settlement, Amount Included in Other Income	14	0	14	0
Other expenses:
Litigation Settlement, Amount Subject to Shareholder Incentive	14
Edison International Parent and Other
Other income:
Other income	0	4	0	2
Other expenses:
Other expenses	$ 1	$ 0	$ 0	$ 0