Income Taxes (NOL and Carryforwards) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Carryforwards
Loss carryforwards	$ 2,810
Credit carryforwards	545
Deferred tax expense	43	$ (296)	$ (284)
Capistrano Wind
Carryforwards
Deferred tax expense	223	218
Expire in 2022
Carryforwards
Loss carryforwards	7
Credit carryforwards	0
Expire between 2023 to 2026
Carryforwards
Loss carryforwards	30
Credit carryforwards	0
Expire between 2029 to 2043
Carryforwards
Loss carryforwards	1,504
Credit carryforwards	535
No expiration date
Carryforwards
Loss carryforwards	1,269
Credit carryforwards	10
SCE
Carryforwards
Loss carryforwards	1,858
Credit carryforwards	60
Deferred tax expense	62	$ (263)	$ (243)
SCE | Expire in 2022
Carryforwards
Loss carryforwards	7
Credit carryforwards	0
SCE | Expire between 2023 to 2026
Carryforwards
Loss carryforwards	25
Credit carryforwards	0
SCE | Expire between 2029 to 2043
Carryforwards
Loss carryforwards	702
Credit carryforwards	60
SCE | No expiration date
Carryforwards
Loss carryforwards	1,124
Credit carryforwards	$ 0