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Discontinued Operations (Details) (Edison Mission Energy, USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 installments | Feb. 18, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Liabilities For Joint Tax and Qualified Retirement Plans Resulting from Deconsolidation | $ 350 |
Percentage of Tax Benefits To Be Paid | 50.00% |
Tax Attributes Estimated Amount | 1,191 |
Estimated Period for Updating Procedure | 6 months |
Cash Portion of Settlement Payment | 225 |
Number of Installments | 2 |
Interest Rate On Installments | 5.00% |
Tax Attribute Including Interest, Installment One | 199 |
Tax Attribute Including Interest Installment Two | 210 |
Amount Required for Escrow |  | 50
Estimated Amount That Tax Benefits Will Exceed Liabilities | 200 |
Deferred Tax Assets, Net of Valuation Allowance | 198 |
Provision for losses | 150 |
Cumulative impact of deconsolidation on earnings | 48 |
Subsequent Event [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Estimated Income From Settlement Expected to Be Recorded | $ 152 |

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