FACILITIES UNDER JOINT OWNERSHIP (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Jul. 31, 2010
Jointly Owned Utility Plant Interests [Line Items]
Asset Retirement Obligation, Nuclear Power Plant	$ 558
Utility Share Of Nuclear Decommissioning Costs	860	768
Utility Share Of Nuclear Decommissioning Costs Adjusted For Inflation	880
Jointly Owned Nuclear Power Plant [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	20.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	351
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	65
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	115
Jointly Owned Electricity Transmission and Distribution System [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	91.00%
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service	330
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation	198
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 11

No authoritative reference available.

No definition available.

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- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

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- Definition

No authoritative reference available.

+ References

No definition available.

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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

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- Definition

The period end amount of construction work in progress at a jointly owned electricity generation plant.

+ References

+ Details

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- Definition

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

+ References

+ Details

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- Definition

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

+ References

+ Details

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