Other Income and Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
SCE other income and (expenses):
Net periodic benefit costs – non-service components		$ 8		$ 15
Total SCE other income and (expenses)	$ 76	41	$ 176	98
Other income and (expenses) of Edison International Parent and Other:
Net periodic benefit costs – non-service components		8		15
Total Edison International other income and (expenses)	76	41	176	98
Edison International Parent and Other
SCE other income and (expenses):
Net periodic benefit costs – non-service components	0	(1)	(1)	(12)
Other income	4	0	4	0
Other income and (expenses) of Edison International Parent and Other:
Net periodic benefit costs – non-service components	0	(1)	(1)	(12)
Southern California Edison
SCE other income and (expenses):
Equity allowance for funds used during construction	32	24	76	65
Increase in cash surrender value of life insurance policies	16	12	30	34
Interest income	6	3	15	5
Net periodic benefit costs – non-service components	26	9	79	27
Civic, political and related activities and donations	(9)	(6)	(25)	(17)
Other income	1
Other expense		0	(2)	(4)
Total SCE other income and (expenses)	72	42	173	110
Other income and (expenses) of Edison International Parent and Other:
Net periodic benefit costs – non-service components	26	9	79	27
Total Edison International other income and (expenses)	$ 72	$ 42	$ 173	$ 110