Interest and Other Income and Other Expenses (Details) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2014 USD ($) agreements	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
SCE interest and other income:
Interest and other income		$ 32	$ 40	$ 114	$ 109
SCE other expenses:
Total Edison International other expenses		15	29	40	52
Southern California Edison
SCE interest and other income:
Equity allowance for funds used during construction		21	17	63	45
Generator settlements		0	1	0	15
Increase in cash surrender value of life insurance policies		5	10	22	28
Interest income		1	1	4	6
Other		2	7	4	11
Total SCE interest and other income		29	36	93	105
Interest and other income		29	36	93	105
SCE other expenses:
Penalties		1	15	1	15
Civic, political and related activities and donations		8	8	21	22
Other		6	6	17	15
Total SCE other expenses		15	29	39	52
Total Edison International other expenses		15	29	39	52
Southern California Edison | FERC-Approved Settlement Agreements
SCE other expenses:
Settlement amount					216
Amount subject to shareholder incentive					15
Southern California Edison | San Bernardino And San Gabriel
SCE other expenses:
Number of settlements | agreements	2
Edison International Parent and Other
SCE interest and other income:
Other income of Edison International Parent and Other		3	4	21	4
SCE other expenses:
Other expense of Edison International Parent and Other		$ 0	$ 0	$ 1	$ 0
Edison International Parent and Other | San Bernardino And San Gabriel | State General Fund
SCE other expenses:
Payments for settlements	$ 15