Leases (Summary of Other Information) (Details) - Southern California Edison $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Other operating leases	$ 15
PPA Finance leases, Weighted average remaining lease term (in years)	11 years 11 months 1 day
PPA Finance leases, Weighted average discount rate	8.72%
PPA Operating Leases
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 60
Weighted average remaining lease term (in years)	15 years 6 months 29 days
Weighted average discount rate	4.40%
Other Operating Leases
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 23
Weighted average remaining lease term (in years)	12 years 9 months
Weighted average discount rate	3.89%