Leases (Summary of Other Information) (Details) - Southern California Edison - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
PPA Finance leases, Weighted average remaining lease term (in years)	10 years 10 months 24 days	11 years 8 months 15 days
PPA Finance leases, Weighted average discount rate	8.83%	8.74%
PPA leases
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 74	$ 98
Other operating leases	$ 463	$ 0
Weighted average remaining lease term (in years)	9 years 9 months 29 days	16 years 10 days
Weighted average discount rate	3.08%	4.44%
Other leases
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 33	$ 34
Other operating leases	$ 42	$ 23
Weighted average remaining lease term (in years)	12 years 4 months 6 days	12 years 9 months
Weighted average discount rate	3.74%	3.89%