Leases (Other Information) (Details) - SCE - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
PPA finance leases, weighted average remaining lease term (in years)	15 years 11 months 1 day	10 years 10 months 24 days
PPA finance leases, weighted average discount rate	11.29%	8.83%
PPA Operating Leases
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 199	$ 74
ROU assets obtained in exchange for lease obligations	$ 610	$ 463
Weighted average remaining lease term (in years)	10 years 3 months 3 days	9 years 9 months 29 days
Weighted average discount rate	2.82%	3.08%
Other Operating Leases
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 33	$ 33
ROU assets obtained in exchange for lease obligations	$ 38	$ 42
Weighted average remaining lease term (in years)	11 years 8 months 1 day	12 years 4 months 6 days
Weighted average discount rate	3.47%	3.74%