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Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Movement in Valuation and Qualifying Accounts |  |  |  |  |  |
Balance at Beginning of Period | $ 79.6 |  | $ 89.9 |  | $ 56.0 |
Charged to Costs and Expenses | 93.2 |  | 50.2 |  | 42.0 |
Charged to Other Accounts | 0 |  | 0 |  | 24.5 |
Deductions | 46.7 | [1] | 60.5 | [1] | 32.6 | [1]
Balance at End of Period | 126.1 |  | 79.6 |  | 89.9 |
Retirement liabilities for EME employees | 2,614 |  | 2,715 |  |  |
Deferred tax assets, loss and credit carryforwards | 1,515 |  | 689 |  |  |
Deferred tax assets, valuation allowance | 1,017 |  | 0 |  |  |
Allowance For Uncollectible Accounts From Customers |  |  |  |  |  |
Movement in Valuation and Qualifying Accounts |  |  |  |  |  |
Balance at Beginning of Period | 42.0 |  | 36.1 |  | 33.9 |
Charged to Costs and Expenses | 34.6 |  | 31.0 |  | 27.0 |
Charged to Other Accounts | 0 |  | 0 |  | 0 |
Deductions | 30.0 |  | 25.1 |  | 24.8 |
Balance at End of Period | 46.6 |  | 42.0 |  | 36.1 |
Allowance For Uncollectible Accounts From Others |  |  |  |  |  |
Movement in Valuation and Qualifying Accounts |  |  |  |  |  |
Balance at Beginning of Period | 37.6 |  | 53.8 |  | 22.1 |
Charged to Costs and Expenses | 58.6 |  | 19.2 |  | 15.0 |
Charged to Other Accounts | 0 |  | 0 |  | 24.5 | [2]
Deductions | 16.7 |  | 35.4 | [2] | 7.8 |
Balance at End of Period | 79.5 |  | 37.6 |  | 53.8 |
Tax Valuation Allowance |  |  |  |  |  |
Movement in Valuation and Qualifying Accounts |  |  |  |  |  |
Balance at Beginning of Period | 0 |  |  |  |  |
Charged to Costs and Expenses | 0 |  |  |  |  |
Charged to Other Accounts | 1,016.5 | [3] |  |  |  |
Deductions | 0 |  |  |  |  |
Balance at End of Period | 1,016.5 |  |  |  |  |
Edison Mission Energy |  |  |  |  |  |
Movement in Valuation and Qualifying Accounts |  |  |  |  |  |
Deferred tax assets, valuation allowance | 1,017 |  |  |  |  |
Southern California Edison |  |  |  |  |  |
Movement in Valuation and Qualifying Accounts |  |  |  |  |  |
Balance at Beginning of Period | 75.0 |  | 85.5 |  | 52.9 |
Charged to Costs and Expenses | 46.6 |  | 49.9 |  | 41.8 |
Charged to Other Accounts | 0 |  | 0 |  | 22.8 |
Deductions | 46.7 | [1] | 60.4 | [1] | 32.0 | [1]
Balance at End of Period | 74.9 |  | 75.0 |  | 85.5 |
Retirement liabilities for EME employees | 2,245 |  | 2,461 |  |  |
Deferred tax assets, loss and credit carryforwards | 125 |  | 15 |  |  |
Deferred tax assets, valuation allowance | 0 |  | 0 |  |  |
Write-off on termination of agreement |  |  | 23 |  |  |
Southern California Edison | Allowance For Uncollectible Accounts From Customers |  |  |  |  |  |
Movement in Valuation and Qualifying Accounts |  |  |  |  |  |
Balance at Beginning of Period | 42.0 |  | 36.1 |  | 33.9 |
Charged to Costs and Expenses | 34.6 |  | 31.0 |  | 27.0 |
Charged to Other Accounts | 0 |  | 0 |  | 0 |
Deductions | 30.0 |  | 25.1 |  | 24.8 |
Balance at End of Period | 46.6 |  | 42.0 |  | 36.1 |
Southern California Edison | Allowance For Uncollectible Accounts From Others |  |  |  |  |  |
Movement in Valuation and Qualifying Accounts |  |  |  |  |  |
Balance at Beginning of Period | 33.0 |  | 49.4 |  | 19.0 |
Charged to Costs and Expenses | 12.0 |  | 18.9 |  | 14.8 |
Charged to Other Accounts | 0 |  | 0 |  | 22.8 | [2]
Deductions | 16.7 |  | 35.3 | [2] | 7.2 |
Balance at End of Period | 28.3 |  | 33.0 |  | 49.4 |
Pension Plans |  |  |  |  |  |
Movement in Valuation and Qualifying Accounts |  |  |  |  |  |
Retirement liabilities for EME employees | 1,387 |  | 1,329 |  |  |
Deconsolidated charges recorded in other comprehensive income | 34 | [4] | 0 | [4] |  |
Pension Plans | Edison Mission Energy |  |  |  |  |  |
Movement in Valuation and Qualifying Accounts |  |  |  |  |  |
Retirement liabilities for EME employees | 80 |  |  |  |  |
Deconsolidated charges recorded in other comprehensive income | 34 |  |  |  |  |
Pension Plans | Southern California Edison |  |  |  |  |  |
Movement in Valuation and Qualifying Accounts |  |  |  |  |  |
Retirement liabilities for EME employees | 1,108 |  | 1,135 |  |  |
Deconsolidated charges recorded in other comprehensive income | 0 | [4] | 0 | [4] |  |
Plan Support Agreement |  |  |  |  |  |
Movement in Valuation and Qualifying Accounts |  |  |  |  |  |
Net receivable under plan support agreement | $ 46 |  |  |  |  |
[1] | Accounts written off, net.
[2] | In 2010, SCE recorded a reserve against an uncollectible receivable related to contract termination negotiations. During 2011, the $23 million was written-off.
[3] | Edison International recorded deferred tax assets of $1.5 billion related to net operating losses and tax carryforwards that pertain to Edison International's consolidated or combined federal and state tax returns, including EME. Edison International continues to consolidate EME for federal and certain combined state tax returns. Under federal and state tax regulations, a tax deconsolidation of EME in future periods, as expected through the bankruptcy proceeding, would result in EME retaining a portion of such carryforward benefits and reducing the amounts that Edison International would be eligible to use in future periods. As a result of the expected future tax deconsolidation and separation of EME from Edison International, Edison International has recorded a valuation allowance of $1.0 billion based on the estimated amount of such benefits as of December 31, 2012, as calculated under the applicable federal and state tax regulations.
[4] | The retirement plan liabilities of EME have been deconsolidated as a result of the bankruptcy filing by EME, except for qualified pension plans that Edison International is jointly liable with EME under the Internal Revenue Code. See Note 17 for further information.

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