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Income Taxes (Components of Net Accumulated Deferred Income Tax Liability) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Deferred tax assets: |  |  |  |
Property | $ 478 | $ 399 |  |
Wildfire reserve | 847 | 709 |  |
Nuclear decommissioning trust assets in excess of nuclear ARO liability | 449 | 323 |  |
Loss and credit carryforwards | 1,515 | 1,375 |  |
Regulatory asset | 739 | 798 |  |
Pension and postretirement benefits other than pensions, net | 170 | 171 |  |
Other | 408 | 188 |  |
Sub-total | 4,606 | 3,963 |  |
Less: valuation allowance | 35 | 36 |  |
Total | 4,571 | 3,927 |  |
Deferred tax liabilities: |  |  |  |
Property | 8,244 | 7,685 |  |
Regulatory liability | 570 | 367 |  |
Nuclear decommissioning trust assets | 449 | 323 |  |
Other | 320 | 57 |  |
Total | 9,583 | 8,432 |  |
Accumulated deferred income tax liability, net | 5,012 | 4,505 |  |
Unrecognized tax benefits | 370 | 338 | $ 432 | $ 471
Recorded valuation allowance | 30 |  |  |
Loss and Credit Carryforwards |  |  |  |
Deferred tax liabilities: |  |  |  |
Unrecognized tax benefits | 212 |  |  |
SCE |  |  |  |
Deferred tax assets: |  |  |  |
Property | 435 | 388 |  |
Wildfire reserve | 847 | 709 |  |
Nuclear decommissioning trust assets in excess of nuclear ARO liability | 449 | 323 |  |
Loss and credit carryforwards | 253 | 154 |  |
Regulatory asset | 739 | 798 |  |
Pension and postretirement benefits other than pensions, net | 40 | 46 |  |
Other | 416 | 184 |  |
Sub-total | 3,179 | 2,602 |  |
Less: valuation allowance | 0 | 0 |  |
Total | 3,179 | 2,602 |  |
Deferred tax liabilities: |  |  |  |
Property | 8,234 | 7,685 |  |
Regulatory liability | 570 | 367 |  |
Nuclear decommissioning trust assets | 449 | 323 |  |
Other | 310 | 54 |  |
Total | 9,563 | 8,429 |  |
Accumulated deferred income tax liability, net | 6,384 | 5,827 |  |
Unrecognized tax benefits | 282 | 249 | $ 331 | $ 371
SCE | Loss and Credit Carryforwards |  |  |  |
Deferred tax liabilities: |  |  |  |
Unrecognized tax benefits | 130 |  |  |
Capital loss from sale of SoCore Energy |  |  |  |
Deferred tax liabilities: |  |  |  |
Recorded valuation allowance | $ 5 | $ 4 |  |

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