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Summary of Significant Accounting Policies (Property, Plant and Equipment) (Details) (USD $) | 12 Months Ended | 3 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2013 San Onofre [Member] | Dec. 31, 2013 San Onofre [Member] | Dec. 31, 2013 Southern California Edison | Dec. 31, 2012 Southern California Edison | Dec. 31, 2011 Southern California Edison | Dec. 31, 2013 Southern California Edison Generation plant | Dec. 31, 2013 Southern California Edison Distribution plant | Dec. 31, 2013 Southern California Edison Transmission plant | Dec. 31, 2013 Southern California Edison General plant and other | Dec. 31, 2013 Southern California Edison Minimum Generation plant | Dec. 31, 2013 Southern California Edison Minimum Distribution plant | Dec. 31, 2013 Southern California Edison Minimum Transmission plant | Dec. 31, 2013 Southern California Edison Minimum General plant and other | Dec. 31, 2013 Southern California Edison Maximum Generation plant | Dec. 31, 2013 Southern California Edison Maximum Distribution plant | Dec. 31, 2013 Southern California Edison Maximum Transmission plant | Dec. 31, 2013 Southern California Edison Maximum General plant and other
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Useful Lives |  |  |  |  |  |  |  |  |  |  |  |  | 12 years | 20 years | 40 years | 5 years | 60 years | 60 years | 65 years | 60 years
Weighted-Average Useful Lives |  |  |  |  |  |  |  |  | 38 years | 40 years | 46 years | 23 years |  |  |  |  |  |  |  |
Depreciation expense of utility property, plant and equipment | $ 1,310,000,000 | $ 1,260,000,000 | $ 1,160,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense stated as a percent of average original cost of depreciable utility plant (percent) |  |  |  |  |  | 4.20% | 4.30% | 4.30% |  |  |  |  |  |  |  |  |  |  |  |
Allowance for funds used during construction equity |  |  |  |  |  | 72,000,000 | 96,000,000 | 96,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Allowance for funds used during construction debt |  |  |  |  |  | 33,000,000 | 40,000,000 | 42,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation, Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | 2,782,000,000 |  |  |  | 2,680,000,000 | 2,782,000,000 | 2,610,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion |  |  |  |  |  | 182,000,000 | 161,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Revisions |  |  |  | 455,000,000 |  | 455,000,000 | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities settled |  |  |  |  |  | (1,000,000) | (1,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance | $ 3,418,000,000 | $ 2,782,000,000 |  |  | $ 2,680,000,000 | $ 3,418,000,000 | $ 2,782,000,000 | $ 2,610,000,000 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Weighted-average useful life of utility plant owned by the public utility. + References No definition available. + 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 Noncurrent portion of 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 + Details
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- Definition The component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501569&loc=d3e55921-110430 + Details
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