Leases (Summary of Other Information) (Details) - Southern California Edison $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Other operating leases	$ 23
PPA Finance leases, Weighted average remaining lease term (in years)	11 years 8 months 15 days
PPA Finance leases, Weighted average discount rate	8.74%
PPA Operating Leases
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 98
Weighted average remaining lease term (in years)	16 years 10 days
Weighted average discount rate	4.44%
Other Operating Leases
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 34
Weighted average remaining lease term (in years)	12 years 9 months
Weighted average discount rate	3.89%