Income Taxes (NOL and Carryforwards) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Carryforwards
Loss carryforwards	$ 3,368
Credit carryforwards	481
Deferred tax expense	108	$ (177)	$ 43
Capistrano Wind
Carryforwards
Deferred tax expense	106	121
Expire in 2024
Carryforwards
Loss carryforwards	7
Credit carryforwards	0
Expire between 2025 to 2028
Carryforwards
Loss carryforwards	22
Credit carryforwards	0
Expire between 2029 to 2043
Carryforwards
Loss carryforwards	1,714
Credit carryforwards	471
No expiration date
Carryforwards
Loss carryforwards	1,625
Credit carryforwards	10
SCE
Carryforwards
Loss carryforwards	2,339
Credit carryforwards	63
Deferred tax expense	179	$ (111)	$ 62
SCE | Expire in 2024
Carryforwards
Loss carryforwards	7
Credit carryforwards	0
SCE | Expire between 2025 to 2028
Carryforwards
Loss carryforwards	22
Credit carryforwards	0
SCE | Expire between 2029 to 2043
Carryforwards
Loss carryforwards	862
Credit carryforwards	63
SCE | No expiration date
Carryforwards
Loss carryforwards	1,448
Credit carryforwards	$ 0