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Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract] |  |
Accumulated depreciation | $ (7,424) | $ (6,894)
Total utility property, plant and equipment | 30,200 | 27,569
Southern California Edison |  |
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract] |  |
Transmission | 7,059 | 6,109
Distribution | 16,872 | 15,938
Generation | 4,455 | 4,063
General plant and other | 4,358 | 3,951
Accumulated depreciation | (7,424) | (6,894)
Total utility property, plant and equipment, Gross | 25,320 | 23,167
Construction work in progress | 4,271 | 3,922
Nuclear fuel, at amortized cost | 609 | 480
Total utility property, plant and equipment | 30,200 | 27,569
Southern California Edison | Eldorado |  |
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract] |  |
Construction work in progress | 11 |
Nuclear fuel, at amortized cost | 0 |
Plant in Service | 73 |
Accumulated Depreciation | 14 |
Net Book Value | 70 |
Ownership Interest | 60.00% |
Southern California Edison | Pacific Intertie |  |
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract] |  |
Construction work in progress | 6 |
Nuclear fuel, at amortized cost | 0 |
Plant in Service | 189 |
Accumulated Depreciation | 70 |
Net Book Value | 125 |
Ownership Interest | 50.00% |
Southern California Edison | Four Corners Unit 4 And 5 (coal) |  |
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract] |  |
Construction work in progress | 17 |
Nuclear fuel, at amortized cost | 0 |
Plant in Service | 589 |
Accumulated Depreciation | 545 |
Net Book Value | 61 |
Ownership Interest | 48.00% |
Southern California Edison | Mohave (coal) |  |
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract] |  |
Construction work in progress | 32 |
Nuclear fuel, at amortized cost | 0 |
Plant in Service | 327 |
Accumulated Depreciation | 292 |
Net Book Value | 67 |
Ownership Interest | 56.00% |
Southern California Edison | Palo Verde (nuclear) |  |
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract] |  |
Construction work in progress | 67 |
Nuclear fuel, at amortized cost | 142 |
Plant in Service | 1,819 |
Accumulated Depreciation | 1,480 |
Net Book Value | 548 |
Ownership Interest | 16.00% |
Southern California Edison | San Onofre (nuclear) |  |
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract] |  |
Construction work in progress | 223 |
Nuclear fuel, at amortized cost | 467 |
Plant in Service | 5,300 |
Accumulated Depreciation | 4,017 |
Net Book Value | 1,973 |
Ownership Interest | 78.21% |
Southern California Edison | Aggregate Jointly Owned Utility Projects |  |
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract] |  |
Construction work in progress | 356 |
Nuclear fuel, at amortized cost | 609 |
Plant in Service | 8,297 |
Accumulated Depreciation | 6,418 |
Net Book Value | $ 2,844 |

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- Definition The period end amount owned by the reporting utility of a jointly owned utility plant in service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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- Definition The total period end amount of plant in service and construction in progress net of accumulated depreciation for the utility's share of jointly owned electricity generation plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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- Definition The period end amount of accumulated depreciation in a jointly owned electricity generation plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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- Definition The proportionate share of interest (percent) in a jointly owned utility plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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- Definition The carrying amount as of the balance sheet of nuclear fuel held as property plant and equipment. This amount is net of amortization based on the energy produced over the life of the fuel. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility. + References No definition available. + Details
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- Definition Period end amount of property, plant and equipment (PPE) related to utility distribution. + References No definition available. + Details
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- Definition Period end amount of property, plant and equipment (PPE) related to generation or processing owned by public utility. + References No definition available. + Details
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- Definition Period end amount of total net PPE. + References No definition available. + Details
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- Definition Period end book value of other property, plant and equipment (PPE) owned (but not classified elsewhere) by the public utility. + References No definition available. + Details
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