Name:	nee_LongTermDebtIncludingCurrentMaturitiesFairValueDisclosure
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Data Type:	xbrli:monetaryItemType
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marketable securities, unrealized gain (loss) on securities still held

No definition available.

Name:	nee_Marketablesecuritiesunrealizedgainlossonsecuritiesstillheld
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Other investments, primarily notes receivable, that are carried at estimated fair value or cost, which approximates fair value.

No definition available.

Name:	nee_OtherInvestmentsFinancialInstrumentsPrimarilyNotesReceivableFairValueDisclosure
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
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This element represents the portion of the balance sheet assertion valued at fair value by the entity. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. An amount representing decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations.

No definition available.

Name:	nee_SpecialUseFundsFairValueDisclosure
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
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This item represents the weighted-average maturity of debt securities (in years) in nuclear decommissioning funds at the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

No definition available.

Name:	nee_SpecialUseFundsNuclearDecommissioningFundsWeightedAverageMaturity
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Storm fund assets held by a regulated entity to pay for storm-related costs as incurred in future periods.

No definition available.

Name:	nee_SpecialUseFundsStormFundAssets
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This item represents the weighted-average maturity of debt securities (in years) held by a regulated entity in the storm fund at the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

No definition available.

Name:	nee_SpecialUseFundsStormFundWeightedAverageMaturity
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For FPL, the amount of storm funded included in special use funds on Consolidated Balance Sheets.

No definition available.

Name:	nee_StormFundIncludedInSpecialUseFunds
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Data Type:	xbrli:monetaryItemType
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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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Period Type:	instant

This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

No definition available.

Name:	us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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