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Summary of Significant Accounting Policies Asset Retirement Obligation (Details) (USD $) |  | 6 Months Ended | 12 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2014 Southern California Edison | Dec. 31, 2013 Southern California Edison | Jun. 30, 2014 Southern California Edison San Onofre | Dec. 31, 2013 Southern California Edison San Onofre
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Decommissioning Costs, Future Value | $ 4,400,000,000 | $ 3,300,000,000 |  |  |  |  |
Asset Retirement Obligation, Discount Rate | 6.30% |  |  |  |  | 6.30% |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | 3,418,000,000 |  | 2,782,000,000 |  |  | 2,700,000,000
Accretion1 |  | 106,000,000 | [1] | 182,000,000 | [1] |  |
Revisions |  | (604,000,000) |  | 455,000,000 |  | 604,000,000 |
Liabilities settled |  | (1,000,000) |  | (1,000,000) |  |  |
Ending balance |  | $ 2,919,000,000 |  | $ 3,418,000,000 |  | $ 2,200,000,000 | $ 2,700,000,000
[1] | An ARO represents the present value of a future obligation. Accretion is an increase in the liability to account for the time value of money resulting from discounting.

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- Definition Asset Retirement Obligation, Discount Rate + References No definition available. + Details
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- Definition Decommissioning Liability, Cost Estimate, Undiscounted + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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