Leases (Other Information) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Weighted average remaining finance lease term (in years)	15 years 8 months 1 day	16 years 8 months 1 day	11 years 6 months 3 days
Finance leases weighted average discount rate	11.29%	11.29%	8.76%
PPA Operating Leases
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 305	$ 111	$ 118
Financing cash flows from PPA finance leases	1	1	$ 1
Operating ROU assets obtained in exchange for lease obligations	$ 1,084	$ 463
Weighted average remaining operating lease term (in years)	8 years 1 month 28 days	9 years 9 months	16 years 18 days
Operating leases weighted average discount rate	2.43%	3.12%	4.46%
Other operating leases
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 45	$ 44	$ 44
Operating ROU assets obtained in exchange for lease obligations	$ 71	$ 58	$ 34
Weighted average remaining operating lease term (in years)	11 years 1 month 20 days	12 years 1 month 17 days	12 years 8 months 23 days
Operating leases weighted average discount rate	3.34%	3.63%	3.88%