Name:	nee_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInRegulatoryAssetsAndLiabilities
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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.

Name:	nee_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetLiabilityPurchases
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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.

Name:	nee_FairValueNetAssetsLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInOtherIncome
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Realized and unrealized gains (losses): [Abstract]

No definition available.

Name:	nee_RealizedAndUnrealizedGainsLossesAbstract
Namespace Prefix:	nee_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Reconciliation of changes in fair value based on significant unobservable inputs Roll Forward

No definition available.

Name:	nee_ReconciliationofchangesinfairvaluebasedonsignificantunobservableinputsRollForwardAbstract
Namespace Prefix:	nee_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

Name:	us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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