Income Taxes (Deferred Tax Liability) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Property	$ 856	$ 590
Wildfire reserve	558	1,134
Nuclear decommissioning trust assets in excess of nuclear ARO liability	517	515
Loss and credit carryforwards	3,078	1,991
Regulatory balances	652	841
Pension and postretirement benefits other than pensions, net	153	163
Leases	543	307
Other	165	206
Sub-total	6,522	5,747
Less: valuation allowance	44	35
Total	6,478	5,712
Deferred tax liabilities:
Property	9,645	8,879
Regulatory balances	1,242	1,111
Nuclear decommissioning trust assets	517	515
Leases	543	307
Other	207	207
Total	12,154	11,019
Accumulated deferred income tax liability, net	5,676	5,307
Operating loss carryforwards valuation allowance	277	270
Operating loss carryforward
Deferred tax assets:
Less: valuation allowance	33
Capital loss from sale of SoCore Energy
Deferred tax assets:
Less: valuation allowance	4
Charitable contribution carryover
Deferred tax assets:
Less: valuation allowance	7
SCE
Deferred tax assets:
Property	835	540
Wildfire reserve	558	1,134
Nuclear decommissioning trust assets in excess of nuclear ARO liability	517	515
Loss and credit carryforwards	1,697	683
Regulatory balances	652	841
Pension and postretirement benefits other than pensions, net	30	35
Leases	543	307
Other	179	220
Sub-total	5,011	4,275
Less: valuation allowance	6	0
Total	5,005	4,275
Deferred tax liabilities:
Property	9,633	8,871
Regulatory balances	1,242	1,111
Nuclear decommissioning trust assets	517	515
Leases	543	307
Other	186	192
Total	12,121	10,996
Accumulated deferred income tax liability, net	7,116	6,721
Operating loss carryforwards valuation allowance	221	$ 190
SCE | Charitable contribution carryover
Deferred tax assets:
Less: valuation allowance	$ 6