Income Taxes - Effective Tax Rate (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Tax
Income from operations before income taxes	$ 1,940	$ (61)
Statutory tax rate (as a percent)	21.00%	21.00%
Provision for income tax at federal statutory rate of 21%	$ 407	$ (13)
Increase (decrease) in income tax from:
State tax, net of federal income tax effect	109	(37)
Property-related	(58)	(55)
Other	(10)	(8)
Total income tax (benefit) expense	$ 448	$ (113)
Effective tax rate	23.10%	185.20%
SCE
Income Tax
Income from operations before income taxes	$ 2,089	$ 22
Statutory tax rate (as a percent)	21.00%	21.00%
Provision for income tax at federal statutory rate of 21%	$ 439	$ 5
Increase (decrease) in income tax from:
State tax, net of federal income tax effect	117	(31)
Property-related	(58)	(55)
Other	(10)	(3)
Total income tax (benefit) expense	$ 488	$ (84)
Effective tax rate	23.30%	(381.80%)