Interest and Other Income and Other Expenses (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 31, 2014 claims
SCE interest and other income:
Interest and other income	$ 147	$ 124	$ 149
SCE other expenses:
Total Edison International other expenses	80	74	52
Southern California Edison
SCE interest and other income:
Equity allowance for funds used during construction	65	72	96
Increase in cash surrender value of life insurance policies and life insurance benefits	36	30	27
Interest income	5	10	7
Other	16	10	14
Total SCE interest and other income	122	122	144
Interest and other income	122	122	144
SCE other expenses:
Civic, political and related activities and donations	35	37	32
Penalties	16	20	0
Other	28	17	18
Total SCE other expenses	79	74	50
Total Edison International other expenses	79	74	50
Edison International
SCE interest and other income:
Edison International Parent and Other income	25	2	5
SCE other expenses:
Edison International Parent and Other other expenses	1	0	2
San Bernardino and San Gabriel | Southern California Edison
Other Income And Expense [Line Items]
Loss Contingency, Claims Settled, Number				2
State General Fund Member | San Bernardino and San Gabriel | Southern California Edison
Other Income And Expense [Line Items]
Payments for Legal Settlements				15