Leases (Summary of Other Information) (Details) - SCE $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Financing cash flows from PPA finance leases	$ 1
Other operating leases	$ 34
PPA finance leases, weighted average remaining lease term (in years)	11 years 6 months 3 days
PPA finance leases, weighted average discount rate	8.76%
PPA Operating Leases
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 118
Weighted average remaining lease term (in years)	16 years 18 days
Weighted average discount rate	4.46%
Other Operating Leases
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 44
Weighted average remaining lease term (in years)	12 years 8 months 23 days
Weighted average discount rate	3.88%