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Income Taxes (Components of Net Accumulated Deferred Income Tax Liability) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred tax assets: |  |  |  |  |
Property and software related |  | $ 399 | $ 358 |  |
Wildfire reserve |  | 709 | 0 |  |
Nuclear decommissioning trust assets in excess of nuclear ARO liability |  | 323 | 404 |  |
Loss and credit carryforwards |  | 1,375 | 1,346 |  |
Regulatory asset |  | 798 | 812 |  |
Pension and postretirement benefits other than pensions, net |  | 171 | 178 |  |
Other |  | 188 | 277 |  |
Sub-total |  | 3,963 | 3,375 |  |
Less: valuation allowance4 |  | 36 | 28 |  |
Total |  | 3,927 | 3,347 |  |
Deferred tax liabilities: |  |  |  |  |
Property-related |  | 7,497 | 6,970 |  |
Capitalized software costs |  | 188 | 160 |  |
Regulatory liability |  | 367 | 158 |  |
Nuclear decommissioning trust assets |  | 323 | 404 |  |
Other |  | 57 | 140 |  |
Total |  | 8,432 | 7,832 |  |
Accumulated deferred income tax liability, net |  | 4,505 | 4,485 |  |
Unrecognized tax benefits |  | 338 | 432 | $ 471 | $ 529
Regulatory asset |  | 788 | 809 |  |
Recorded valuation allowance |  | 32 |  |  |
Capital loss from sale of SoCore Energy |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |
Recorded valuation allowance | $ 4 | 4 |  |  |
Loss And Credit Carryforwards |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |
Unrecognized tax benefits |  | 178 |  |  |
SCE |  |  |  |  |
Deferred tax assets: |  |  |  |  |
Property and software related |  | 388 | 357 |  |
Wildfire reserve |  | 709 | 0 |  |
Nuclear decommissioning trust assets in excess of nuclear ARO liability |  | 323 | 404 |  |
Loss and credit carryforwards |  | 154 | 150 |  |
Regulatory asset |  | 798 | 812 |  |
Pension and postretirement benefits other than pensions, net |  | 46 | 50 |  |
Other |  | 184 | 236 |  |
Sub-total |  | 2,602 | 2,009 |  |
Less: valuation allowance4 |  | 0 | 0 |  |
Total |  | 2,602 | 2,009 |  |
Deferred tax liabilities: |  |  |  |  |
Property-related |  | 7,497 | 6,962 |  |
Capitalized software costs |  | 188 | 160 |  |
Regulatory liability |  | 367 | 158 |  |
Nuclear decommissioning trust assets |  | 323 | 404 |  |
Other |  | 54 | 133 |  |
Total |  | 8,429 | 7,817 |  |
Accumulated deferred income tax liability, net |  | 5,827 | 5,808 |  |
Unrecognized tax benefits |  | 249 | $ 331 | $ 371 | $ 353
SCE | Loss And Credit Carryforwards |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |
Unrecognized tax benefits |  | $ 97 |  |  |

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