Leases (Lease Expense) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Total lease cost	$ 2,989	$ 2,076	$ 2,252
PPA Operating Leases
Lessee, Lease, Description [Line Items]
Operating lease cost	305	111	118
Finance lease cost	1	1	1
Variable lease cost	2,097	1,917	2,087
Short term lease cost	539
Total lease cost	2,942	2,029	2,206
Other operating leases
Lessee, Lease, Description [Line Items]
Total lease cost	$ 47	$ 47	$ 46