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Property, Plant and Equipment (Jointly Owned Utility Projects) (Details) - SCE - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Jointly Owned Utility Plant Interests [Line Items] |  |
Nuclear Fuel (at amortized cost) | $ 126 | $ 126
Eldorado |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | 237 |
Construction Work in Progress | 14 |
Accumulated Depreciation | 24 |
Nuclear Fuel (at amortized cost) | 0 |
Net Book Value | $ 227 |
Ownership Interest (percent) | 59.00% |
Pacific Intertie |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 192 |
Construction Work in Progress | 41 |
Accumulated Depreciation | 78 |
Nuclear Fuel (at amortized cost) | 0 |
Net Book Value | $ 155 |
Ownership Interest (percent) | 50.00% |
Palo Verde (nuclear) |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 2,001 |
Construction Work in Progress | 52 |
Accumulated Depreciation | 1,557 |
Nuclear Fuel (at amortized cost) | 126 |
Net Book Value | $ 622 |
Ownership Interest (percent) | 16.00% |
Total |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Plant in Service | $ 2,430 |
Construction Work in Progress | 107 |
Accumulated Depreciation | 1,659 |
Nuclear Fuel (at amortized cost) | 126 |
Net Book Value | $ 1,004 |

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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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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 + Details
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- Definition The period end amount of construction work in progress at 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 + 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 + 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 + 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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