Income Taxes - Components of Net Accumulated Deferred Income Tax Liability (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Property	$ 943	$ 894
Wildfire-related	254	356
Nuclear decommissioning trust assets in excess of nuclear ARO liability	373	380
Loss and credit carryforwards	3,703	3,486
Regulatory balances	610	626
Pension and postretirement benefits other than pensions, net	117	127
Leases	335	345
Other	177	159
Other	6,512	6,373
Less: valuation allowance	17	17
Total	6,495	6,356
Deferred tax liabilities:
Property	11,220	10,627
Regulatory balances	1,299	1,450
Nuclear decommissioning trust assets	373	380
Leases	335	345
Other	187	187
Total	13,414	12,989
Accumulated deferred income tax liability, net	6,919	6,633
Unrecognized tax benefits, net of deferred tax asset and tax credit carryforwards	397
Operating loss carryforwards valuation allowance		363
SEC Schedule, 12-09, Valuation Allowance, Operating Loss Carryforward
Deferred tax assets:
Less: valuation allowance	17
SCE
Deferred tax assets:
Property	929	877
Wildfire-related	251	354
Nuclear decommissioning trust assets in excess of nuclear ARO liability	373	380
Loss and credit carryforwards	2,242	2,103
Regulatory balances	610	626
Pension and postretirement benefits other than pensions, net	21	25
Leases	335	345
Other	167	147
Other	4,928	4,857
Less: valuation allowance	0	0
Total	4,928	4,857
Deferred tax liabilities:
Property	11,202	10,611
Regulatory balances	1,299	1,450
Nuclear decommissioning trust assets	373	380
Leases	335	345
Other	155	158
Total	13,364	12,944
Accumulated deferred income tax liability, net	8,436	8,087
Unrecognized tax benefits, net of deferred tax asset and tax credit carryforwards	$ 327
Operating loss carryforwards valuation allowance		$ 299