Interest and Other Income and Other Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
SCE interest and other income:
Interest and other income	$ 43	$ 46	$ 82	$ 69
SCE other expenses:
Total Edison International other expenses	17	16	24	23
Southern California Edison
SCE interest and other income:
Equity allowance for funds used during construction	21	15	42	28
Generator settlements	0	14	0	14
Increase in cash surrender value of life insurance policies	7	12	17	18
Interest income	2	3	3	5
Other	1	2	2	4
Total SCE interest and other income	31	46	64	69
Interest and other income	31	46	64	69
SCE other expenses:
Civic, political and related activities and donations	9	9	14	13
Other	8	6	10	10
Total SCE other expenses	17	15	24	23
Total Edison International other expenses	17	15	24	23
Southern California Edison | FERC-Approved Settlement Agreements
SCE other expenses:
Settlement amount		208
Amount subject to shareholder incentive		14
Edison International Parent and Other
SCE interest and other income:
Other income of Edison International Parent and Other	12	0	18	0
SCE other expenses:
Other expense of Edison International Parent and Other	$ 0	$ 1	$ 0	$ 0