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Issuances that have taken place during the period in relation to net assets (liabilities) measured at fair value and categorized within Level 3 of the fair value hierarchy.

No definition available.

Name:	nee_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetLiabilityIssuances
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Purchases that have taken place during the period in relation to net assets (liabilities) measured at fair value and categorized within Level 3 of the fair value hierarchy.

No definition available.

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Settlements that have taken place during the period in relation to net assets (liabilities) measured at fair value and categorized within Level 3 of the fair value hierarchy.

No definition available.

Name:	nee_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetLiabilitySettlements
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This element represents [net] transfers in to net assets (liabilities) measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

No definition available.

Name:	nee_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetLiabilityTransfersIn
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This element represents [net] transfers out of net assets (liabilities) measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

No definition available.

Name:	nee_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetLiabilityTransfersOut
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This element represents the net asset (liability) fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

No definition available.

Name:	nee_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetValue
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This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in Operating Revenues. Such unrealized (holding) gains or losses relate to those assets (liabilities) still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

No definition available.

Name:	nee_FairValueNetAssetsLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInOperatingRevenues
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Data Type:	xbrli:monetaryItemType
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This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in other income. Such unrealized (holding) gains or losses relate to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

No definition available.

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This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets) in interest expense; the fair value of which assets was or is measured on a recurring basis using significant unobservable inputs (Level 3).

No definition available.

Name:	nee_FairValueNetAssetsLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInInterestExpense
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This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets) in operating revenues; the fair value of which assets was or is measured on a recurring basis using significant unobservable inputs (Level 3).

No definition available.

Name:	nee_FairValueNetAssetsLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInOperatingRevenues
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Name:	nee_ReconciliationofchangesinfairvaluebasedonsignificantunobservableinputsRollForwardAbstract
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Data Type:	xbrli:stringItemType
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This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets); the fair value of which assets and liabilities was or is measured on a recurring basis using significant unobservable inputs (Level 3).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Data Type:	xbrli:monetaryItemType
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Amount of gain (loss) recognized in other comprehensive income, arising from assets, liabilities and financial instruments classified in shareholders' equity measured at fair value on a recurring basis using unobservable inputs (level 3).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

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