2.2.0.25truefalse009080 - Disclosure - Jointly-Owned Electric Plants (Details)truefalseIn Millions, unless otherwise specifiedfalse1falsefalseUSDtruefalse{dei_LegalEntityAxis} : Fpl Member
{us-gaap_JointlyOwnedUtilityPlantAxis} : Jointly Owned Nuclear Power Plant1 Member
1/1/2010 - 12/31/2010
c00341http://www.sec.gov/CIK0000753308duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseFPL [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldinee_FplMemberdei_LegalEntityAxisexplicitMemberfalsefalseJointly Owned Nuclear Power Plant 1 [Member]us-gaap_JointlyOwnedUtilityPlantAxisxbrldihttp://xbrl.org/2006/xbrldinee_JointlyOwnedNuclearPowerPlant1Memberus-gaap_JointlyOwnedUtilityPlantAxisexplicitMemberu001Standardhttp://www.xbrl.org/2003/instancepurexbrli0u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170$1false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://nexteraenergyresources.com/role/jointlyownedelectricplantsdetails1falsefalsefalse00falsefalsefalsefalsefalse1falsefalseUSDtruefalse{dei_LegalEntityAxis} : Fpl Member
{us-gaap_JointlyOwnedUtilityPlantAxis} : Jointly Owned Nuclear Power Plant1 Member
1/1/2010 - 12/31/2010
c00341http://www.sec.gov/CIK0000753308duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseFPL [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldinee_FplMemberdei_LegalEntityAxisexplicitMemberfalsefalseJointly Owned Nuclear Power Plant 1 [Member]us-gaap_JointlyOwnedUtilityPlantAxisxbrldihttp://xbrl.org/2006/xbrldinee_JointlyOwnedNuclearPowerPlant1Memberus-gaap_JointlyOwnedUtilityPlantAxisexplicitMemberu001Standardhttp://www.xbrl.org/2003/instancepurexbrli0u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170$<
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
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{us-gaap_JointlyOwnedUtilityPlantAxis} : Jointly Owned Electricity Generation Plant1 Member
1/1/2010 - 12/31/2010
c00342http://www.sec.gov/CIK0000753308duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseFPL [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldinee_FplMemberdei_LegalEntityAxisexplicitMemberfalsefalseJointly Owned Electricity Generation Plant 1 [Member]us-gaap_JointlyOwnedUtilityPlantAxisxbrldihttp://xbrl.org/2006/xbrldinee_JointlyOwnedElectricityGenerationPlant1Memberus-gaap_JointlyOwnedUtilityPlantAxisexplicitMemberu000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u001Standardhttp://www.xbrl.org/2003/instancepurexbrli0$OthernaNo definition available.No authoritative reference available.falsefalse9true0us-gaap_JointlyOwnedUtilityPlantNetOwnershipAmountAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefa
lsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.fa
lsefalse10false0us-gaap_JointlyOwnedUtilityPlantNameus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00St. Johns River Power Park units and coal terminalfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIdentifies the name or location used by the utility of a jointly owned utility plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse11false0us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShareus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.20.2falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe proportionate share of interest (percent) in a jointly owned utility plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse15false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://nexteraenergyresources.com/role/jointlyownedelectricplantsdetails1falsefalsefalse00falsefalsefalsefalsefalse3falsefalseUSDtruefalse{dei_LegalEntityAxis} : Fpl Member
{us-gaap_JointlyOwnedUtilityPlantAxis} : Jointly Owned Electricity Generation Plant2 Member
1/1/2010 - 12/31/2010
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alsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.f
alsefalse17false0us-gaap_JointlyOwnedUtilityPlantNameus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00Scherer Unit No. 4falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIdentifies the name or location used by the utility of a jointly owned utility plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse18false0us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShareus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.760.76falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe proportionate share of interest (percent) in a jointly owned utility plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse21false0us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgressus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1true<
/IsNumeric>falsefalse251000000251falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe period end amount of construction work in progress at a jointly owned electricity generation plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse22false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://nexteraenergyresources.com/role/jointlyownedelectricplantsdetails1falsefalsefalse00falsefalsefalsefalsefalse4falsefalseUSDtruefalse{dei_LegalEntityAxis} : Nextera Energy Resources Member
{us-gaap_JointlyOwnedUtilityPlantAxis} : Jointly Owned Nuclear Power Plant2 Member
1/1/2010 - 12/31/2010
c00344http://www.sec.gov/CIK0000753308duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseNextEra Energy Resources [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldinee_NexteraEnergyResourcesMemberdei_LegalEntityAxisexplicitMemberfalsefalseJointly Owned Nuclear Power Plant 2 [Member]us-gaap_JointlyOwnedUtilityPlantAxisxbrldihttp://xbrl.org/2006/xbrldinee_JointlyOwnedNuclearPowerPlant2Memberus-gaap_JointlyOwnedUtilityPlantAxisexplicitMemberu000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u001Standardhttp://www.xbrl.org/2003/instancepurexbrli0$OthernaNo definition available.No authoritative reference available.falsefalse23true0us-gaap_JointlyOwnedUtilityPlantNetOwnershipAmountAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefa
lsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition
available.falsefalse24false0us-gaap_JointlyOwnedUtilityPlantNameus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00Duane ArnoldfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIdentifies the name or location used by the utility of a jointly owned utility plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse25false0us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShareus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.70.7falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe proportionate share of interest (percent) in a jointly owned utility plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse27false0us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciationus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse6200000062[1]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe period end amount of accumulated depreciation in a jointly owned electricity generation plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse28false0us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgressus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1true<
/IsNumeric>falsefalse2700000027falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe period end amount of construction work in progress at a jointly owned electricity generation plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse29false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://nexteraenergyresources.com/role/jointlyownedelectricplantsdetails1falsefalsefalse00falsefalsefalsefalsefalse5falsefalseUSDtruefalse{dei_LegalEntityAxis} : Nextera Energy Resources Member
{us-gaap_JointlyOwnedUtilityPlantAxis} : Jointly Owned Nuclear Power Plant3 Member
1/1/2010 - 12/31/2010
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lsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition
available.falsefalse31false0us-gaap_JointlyOwnedUtilityPlantNameus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00SeabrookfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIdentifies the name or location used by the utility of a jointly owned utility plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse32false0us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShareus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.88230.8823falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe proportionate share of interest (percent) in a jointly owned utility plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse33false0us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInServiceus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1tr
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse34false0us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciationus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse141000000141[1]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe period end amount of accumulated depreciation in a jointly owned electricity generation plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse35false0us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgressus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1true<
/IsNumeric>falsefalse7100000071falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe period end amount of construction work in progress at a jointly owned electricity generation plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse36false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://nexteraenergyresources.com/role/jointlyownedelectricplantsdetails1falsefalsefalse00falsefalsefalsefalsefalse6falsefalseUSDtruefalse{dei_LegalEntityAxis} : Nextera Energy Resources Member
{us-gaap_JointlyOwnedUtilityPlantAxis} : Jointly Owned Electricity Generation Plant3 Member
1/1/2010 - 12/31/2010
c00346http://www.sec.gov/CIK0000753308duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseNextEra Energy Resources [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldinee_NexteraEnergyResourcesMemberdei_LegalEntityAxisexplicitMemberfalsefalseJointly Owned Electricity Generation Plant 3 [Member]us-gaap_JointlyOwnedUtilityPlantA
xisxbrldihttp://xbrl.org/2006/xbrldinee_JointlyOwnedElectricityGenerationPlant3Memberus-gaap_JointlyOwnedUtilityPlantAxisexplicitMemberu000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u001Standardhttp://www.xbrl.org/2003/instancepurexbrli0$OthernaNo definition available.No authoritative reference available.falsefalse37true0us-gaap_JointlyOwnedUtilityPlantNetOwnershipAmountAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse38false0us-gaap_JointlyOwnedUtilityPlantNameus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00Wyman Station Unit No. 4falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIdentifies the name or location used by the utility of a jointly owned utility plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse39false0us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShareus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.84350.8435falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe proportionate share of interest (percent) in a jointly owned utility plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse40false0us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInServiceus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1tr
uefalsefalse104000000104[1]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe 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 SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse41false0us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciationus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse3900000039[1]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe period end amount of accumulated depreciation in a jointly owned electricity generation plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse42false0us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgressus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1true<
/IsNumeric>falsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe period end amount of construction work in progress at a jointly owned electricity generation plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse43false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://nexteraenergyresources.com/role/jointlyownedelectricplantsdetails1falsefalsefalse00falsefalsefalsefalsefalse7falsefalseUSDtruefalse{dei_LegalEntityAxis} : Corporate And Other Member
{us-gaap_JointlyOwnedUtilityPlantAxis} : Jointly Owned Electricity Transmission and Distribution System [Member]
1/1/2010 - 12/31/2010
c00347http://www.sec.gov/CIK0000753308duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseCorporate and Other [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldinee_CorporateAndOtherMemberdei_LegalEntityAxisexplicitMemberfalsefalseJointly Owned Electricity Transmission and Distribution System [Member]us-gaap_JointlyOwnedUtili
tyPlantAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_JointlyOwnedElectricityTransmissionAndDistributionSystemMemberus-gaap_JointlyOwnedUtilityPlantAxisexplicitMemberu001Standardhttp://www.xbrl.org/2003/instancepurexbrli0u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170$OthernaNo definition available.No authoritative reference available.falsefalse44true0us-gaap_JointlyOwnedUtilityPlantNetOwnershipAmountAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTy
pestringNo definition available.falsefalse45false0us-gaap_JointlyOwnedUtilityPlantNameus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00Transmission substation assets located in Seabrook, New HampshirefalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIdentifies the name or location used by the utility of a jointly owned utility plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse46false0us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShareus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.88230.8823falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe proportionate share of interest (percent) in a jointly owned utility plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse47false0us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInServiceus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1tr
uefalsefalse5900000059[1]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe 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 SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse48false0us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciationus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse1200000012[1]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe period end amount of accumulated depreciation in a jointly owned electricity generation plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse49false0us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgressus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1true<
/IsNumeric>falsefalse50000005falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe period end amount of construction work in progress at a jointly owned electricity generation plant.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C
falsefalse1Excludes nuclear fuel.149Jointly-Owned Electric Plants (Details) (USD $)MillionsUnKnownUnKnownUnKnowntruetrue