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Commitments and Contingencies (Commitments Textual) (Details) (Southern California Edison, USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Operating lease rent expense | $ 75,000,000 | $ 66,000,000 | $ 62,000,000
Decommissioning liability | 2,700,000,000 |  |
Decommissioning estimated cost | 8,600,000,000 |  |
Decommissioning cost escalated rates, low end of range (percent) | 1.80% |  |
Decommissioning cost escalated rates, high end of range (percent) | 6.90% |  |
Decommissioning trusts contribution amount per year | 23,000,000 | 23,000,000 | 23,000,000
Decommissioning funds estimated annual earnings, net of tax percentage, low end of range (percent) | 4.20% |  |
Decommissioning funds estimated annual earnings, net of tax percentage, high end of range (percent) | 5.70% |  |
Decommissioning inactive nuclear facilities asset retirement obligation | 68,000,000 |  |
Decommissioning expenditures to date | 598,000,000 |  |
Decommissioning expense under rate making method | 23,000,000 | 23,000,000 | 30,000,000
Decommissioning active nuclear facilities asset retirement obligation | 2,600,000,000 | 2,500,000,000 |
Renewable Energy Contracts |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Number of renewable energy contracts (number of contracts) | 53 |  |
Qualifying Facility Power Purchase Agreements |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Number of qualifying small power production facility contracts (number of contracts) | 155 |  |
Combined Heat and Power Contracts |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Number of combined heat and power contracts (number of contracts) | 10 |  |
Other Purchase Agreements |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Number of tolling arrangements (number of agreements) | 14 |  |
Number of power call options (options) | 19 |  |
Number of resource adequacy contracts (number of contracts) | 112 |  |
Other Contractual Obligations |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Costs incurred for other commitments | 249,000,000 | 281,000,000 | 177,000,000
Operating Leases Purchase Power Contracts |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Operating lease expense | 1,300,000,000 | 1,400,000,000 | 1,300,000,000
Capital Leases Power Contracts |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Capital lease power purchase agreement | 216,000,000 | 222,000,000 |
Capital leases accumulated amortization | 33,000,000 | 27,000,000 |
Capital leases future minimum payments, current | 6,000,000 | 6,000,000 |
Capital leases future minimum payments, noncurrent | 210,000,000 | 216,000,000 |
Purchase contract, met requirements for capital lease treatment | 667,000,000 |  |
Environmental Indemnities |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Maximum liability under indemnity per Mountainview purchase agreement for damages and other amounts | $ 60,000,000 |  |

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- Definition This element represents the number of qualifying small power production facility contracts. + References No definition available. + Details
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- Definition This element represents the carrying amount of net capital leases reflected on the consolidated balance sheets. + References No definition available. + Details
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- Definition The current portion of discounted value of future cash flows under leases meeting the criteria for capitalization. + References No definition available. + Details
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- Definition The noncurrent portion discounted value of future cash flows under leases meeting the criteria for capitalization. + References No definition available. + Details
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- Definition This element represents the asset retirement obligation for decommissioning active and inactive nuclear facilities at the balance sheet date. + References No definition available. + Details
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- Definition This element represents the asset retirement obligation for decommissioning active nuclear facilities at the balance sheet date. + References No definition available. + Details
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- Definition This element represents the high end of the range of the escalated rates under decommissioning cost methodology used for rate-making purpose. + References No definition available. + Details
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- Definition This element represents the low end of the range of the escalated rates under decommissioning cost methodology used for rate-making purpose. + References No definition available. + Details
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- Definition This element represents the total estimated cost to decommission its active nuclear facilities. + References No definition available. + Details
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- Definition This element represents the total nuclear decommissioning expense incurred over the life of the San Onofre Unit 1 project. + References No definition available. + Details
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- Definition This element represents the nuclear decommissioning expense under the rate-making method. + References No definition available. + Details
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- Definition This element represents the high end of the range of the estimated annual after-tax earnings on the decommissioning funds. + References No definition available. + Details
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- Definition This element represents the low end of the range of the estimated annual after-tax earnings on the decommissioning funds. + References No definition available. + Details
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- Definition This element represents the asset retirement obligation for decommissioning inactive nuclear facilities at the balance sheet date. + References No definition available. + Details
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- Definition This element represents the approximate amount of annual contributions received by the independent decommissioning trusts in current year. + References No definition available. + Details
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- Definition Long Term Purchase Commitment Cost Incurred + References No definition available. + Details
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- Definition The maximum aggregate potential liability under the purchase agreement for damages and other amounts in connection with environmental liabilities. + References No definition available. + Details
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- Definition Number of Combined Heat and Power Contracts + References No definition available. + Details
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- Definition Represents the number of power call options entered as a part of capacity agreements with third parties. + References No definition available. + Details
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- Definition This element represents the number of renewable energy contracts that were approved by a public utility commission and met critical contract provisions. + References No definition available. + Details
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- Definition Represents the number of resource adequacy contracts entered as a part of capacity agreements with third parties. + References No definition available. + Details
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- Definition Represents the number of tolling arrangements entered as a part of capacity agreements with third parties. + References No definition available. + Details
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- Details
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- Definition The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 122 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 2) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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