Interest and Other Income and Other Expenses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		1 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Southern California Edison	Sep. 30, 2013 Southern California Edison	Sep. 30, 2014 Southern California Edison	Sep. 30, 2013 Southern California Edison	Sep. 30, 2014 Southern California Edison FERC-Approved Settlement Agreements	Sep. 30, 2013 Southern California Edison FERC-Approved Settlement Agreements	Sep. 30, 2014 Southern California Edison FERC-Approved Settlement Agreements agreements	Sep. 30, 2013 Southern California Edison FERC-Approved Settlement Agreements	Sep. 30, 2014 Edison International Parent and Other	Sep. 30, 2013 Edison International Parent and Other	Sep. 30, 2014 Edison International Parent and Other	Sep. 30, 2013 Edison International Parent and Other	Aug. 31, 2014 State General Fund Member Southern California Edison San Bernardino and San Gabriel
Other Income And Expense [Line Items]
Gain Contingency, Claims Settled, Number											8
Litigation Settlement, Amount									$ (216)
Litigation Settlement, Amount Included in Other Income									1	0	15	0
Other income:
Equity allowance for funds used during construction					19	14	50	54
Increase in cash surrender value of life insurance policies					10	10	28	24
Interest income					1	2	6	8
Other					5	1	6	3
Total interest and other income					36	27	105	89
Other income													4	1	4	2
Interest and other income	40	28	109	91	36	27	105	89
Other expenses:
Penalties					15	0	15	0
Civic, political and related activities and donations					8	9	22	24
Other					6	6	15	14
Total other expenses					29	15	52	38
Other expenses													0	0	0	0
Total consolidated other expenses	29	15	52	38	29	15	52	38
Litigation Settlement, Amount Subject to Shareholder Incentive									15
Litigation Settlement Penalties Paid to State																	$ 15