Income Taxes (Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Tax
Statutory tax rate (as a percent)	21.00%	21.00%	21.00%	21.00%
Income from operations before income taxes	$ 645	$ 189	$ 1,152	$ 1,027
Provision for income tax at federal statutory rate of 21%	136	40	242	216
Increase (decrease) in income tax from:
State tax, net of federal income tax effect	12	(16)	(18)	(16)
Property-related	(78)	(47)	(195)	(152)
Other	(2)		(15)	(7)
Total income tax (benefit) expense	$ 68	$ (23)	$ 14	$ 41
Effective tax rate	10.50%	(12.20%)	1.20%	4.00%
Investment tax credit	$ 210
SCE
Income Tax
Statutory tax rate (as a percent)	21.00%	21.00%	21.00%	21.00%
Income from operations before income taxes	$ 736	$ 268	$ 1,413	$ 1,213
Provision for income tax at federal statutory rate of 21%	155	56	297	255
Increase (decrease) in income tax from:
State tax, net of federal income tax effect	18	(11)
Property-related	(78)	(47)	(195)	(152)
Other		1	(8)	(7)
Total income tax (benefit) expense	$ 95	$ (1)	$ 94	$ 96
Effective tax rate	12.90%	(0.40%)	6.70%	7.90%