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Income Taxes (Components of Net Accumulated Deferred Income Tax Liability) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2013
--- | --- | --- | ---
Deferred tax assets: |  |  |
Property and software related | $ 549 | $ 675 |
Nuclear decommissioning trust assets in excess of nuclear ARO liability | 348 | 360 |
Loss and credit carryforwards | 1,418 | 1,388 | $ 2,200
Regulatory balancing accounts | 15 | 21 |
Pension and PBOPs | 300 | 337 |
Other | 419 | 499 |
Sub-total | 3,049 | 3,280 |
Less valuation allowance | 24 | 32 |
Total | 3,025 | 3,248 |
Deferred tax liabilities: |  |  |
Property-related | 10,330 | 9,606 |
Capitalized software costs | 237 | 207 |
Regulatory balancing accounts | 134 | 202 |
Nuclear decommissioning trust assets | 348 | 360 |
PBOPs | 13 | 71 |
Other | 202 | 189 |
Total | 11,264 | 10,635 |
Accumulated deferred income tax liability, net | 8,239 | 7,387 |
SCE |  |  |
Deferred tax assets: |  |  |
Property and software related | 548 | 675 |
Nuclear decommissioning trust assets in excess of nuclear ARO liability | 348 | 360 |
Loss and credit carryforwards | 0 | 0 |
Regulatory balancing accounts | 15 | 21 |
Pension and PBOPs | 93 | 154 |
Other | 408 | 411 |
Sub-total | 1,412 | 1,621 |
Less valuation allowance | 0 | 0 |
Total | 1,412 | 1,621 |
Deferred tax liabilities: |  |  |
Property-related | 10,330 | 9,600 |
Capitalized software costs | 237 | 207 |
Regulatory balancing accounts | 134 | 202 |
Nuclear decommissioning trust assets | 348 | 360 |
PBOPs | 13 | 71 |
Other | 148 | 161 |
Total | 11,210 | 10,601 |
Accumulated deferred income tax liability, net | $ 9,798 | $ 8,980 |

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