Leases (Summary of Lease Payments) (Details) - SCE - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
Lease liabilities	$ 1,085	$ 689
Finance Leases
2021	1
2022	1
2023	1
2024	0
2025	0
Thereafter	5
Total lease payments	8
Amount representing interest	4
Lease liabilities	4	$ 9
PPA Operating Leases
Operating Leases
2021	204
2022	208
2023	159
2024	47
2025	47
Thereafter	443
Total lease payments	1,108
Amount representing interest	203
Lease liabilities	905
Other Operating Leases
Operating Leases
2021	39
2022	32
2023	26
2024	21
2025	18
Thereafter	104
Total lease payments	240
Amount representing interest	60
Lease liabilities	$ 180