Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract]
Accumulated depreciation	$ (8,132)	$ (7,493)
Total utility property, plant and equipment	32,859	30,379
Southern California Edison
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract]
Transmission	10,391	9,117
Distribution	19,255	17,874
Generation	2,986	2,856
General plant and other	4,889	4,674
Accumulated depreciation	(8,132)	(7,493)
Total utility property, plant and equipment, Gross	29,389	27,028
Construction work in progress	3,339	3,219
Nuclear fuel, at amortized cost	131	132
Total utility property, plant and equipment	32,859	30,379
Construction Work in Progress	3,339	3,219
Nuclear Fuel (at amortized cost)	131	132
Southern California Edison \| Eldorado
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract]
Construction work in progress	81
Nuclear fuel, at amortized cost	0
Plant in Service	88
Construction Work in Progress	81
Accumulated Depreciation	17
Nuclear Fuel (at amortized cost)	0
Net Book Value	152
Ownership Interest	62.00%
Southern California Edison \| Pacific Intertie
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract]
Construction work in progress	14
Nuclear fuel, at amortized cost	0
Plant in Service	191
Construction Work in Progress	14
Accumulated Depreciation	74
Nuclear Fuel (at amortized cost)	0
Net Book Value	131
Ownership Interest	50.00%
Southern California Edison \| Palo Verde (nuclear)
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract]
Construction work in progress	83
Nuclear fuel, at amortized cost	131
Plant in Service	1,871
Construction Work in Progress	83
Accumulated Depreciation	1,529
Nuclear Fuel (at amortized cost)	131
Net Book Value	556
Ownership Interest	16.00%
Southern California Edison \| Total
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract]
Construction work in progress	178
Nuclear fuel, at amortized cost	131
Plant in Service	2,150
Construction Work in Progress	178
Accumulated Depreciation	1,620
Nuclear Fuel (at amortized cost)	131
Net Book Value	$ 839

The period end amount owned by the reporting utility of a jointly owned utility plant in service.

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

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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

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- Definition

The period end amount of accumulated depreciation in a jointly owned electricity generation plant.

+ References

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- Definition

The proportionate share of interest (percent) in a jointly owned utility plant.

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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

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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.

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- Definition

Period end amount of construction work in progress in public utility.

+ References

No definition available.

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- Definition

Period end amount of property, plant and equipment (PPE) related to utility distribution.

+ References

No definition available.

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- Definition

Period end amount of property, plant and equipment (PPE) related to generation or processing owned by public utility.

+ References

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- Definition

Period end amount of total net PPE.

+ References

No definition available.

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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.

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- Definition

Period end amount of total gross PPE.

+ References

No definition available.

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- Definition

Period end amount of property, plant and equipment (PPE) related to utility transmission owned by public utility.

+ References

No definition available.

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