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Income Taxes (Components of Net Accumulated Deferred Income Tax Liability) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Deferred tax assets: |  |
Property and software related | $ 600 | $ 728
Unrealized gains and losses | 491 | 385
Loss and credit carryforwards | 1,515 | 689
Regulatory balancing accounts | 80 | 89
Pension and PBOPs | 275 | 179
Other | 723 | 696
Sub-total | 3,684 | 2,766
Less valuation allowance | 1,017 | 0
Total | 2,667 | 2,766
Deferred tax liabilities: |  |
Property-related | 7,289 | 6,502
Capitalized software costs | 325 | 324
Regulatory balancing accounts | 296 | 301
Unrealized gains and losses | 477 | 374
Other | 471 | 419
Total | 8,858 | 7,920
Accumulated deferred income tax liability, net | 6,191 | 5,154
Included in deferred credits and other liabilities | 6,127 | 5,065
Included in current liabilities | 64 | 89
Southern California Edison |  |
Deferred tax assets: |  |
Property and software related | 600 | 728
Unrealized gains and losses | 477 | 374
Loss and credit carryforwards | 125 | 15
Regulatory balancing accounts | 80 | 89
Pension and PBOPs | 99 | 173
Other | 625 | 480
Sub-total | 2,006 | 1,859
Less valuation allowance | 0 | 0
Total | 2,006 | 1,859
Deferred tax liabilities: |  |
Property-related | 7,279 | 6,492
Capitalized software costs | 325 | 324
Regulatory balancing accounts | 296 | 301
Unrealized gains and losses | 477 | 374
Other | 379 | 238
Total | 8,756 | 7,729
Accumulated deferred income tax liability, net | 6,750 | 5,870
Included in deferred credits and other liabilities | 6,669 | 5,781
Included in current liabilities | $ 81 | $ 89

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