XML 56 R39.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Derivative Instruments (Net Notional Volumes and Additional Disclosures) (Details) bbl in Millions, MWh in Millions, MMBTU in Millions, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) MWh MMBTU bbl | Dec. 31, 2017 USD ($) MWh MMBTU bbl
Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ | $ 15,900 | $ 12,100
Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ | $ 656 | $ 718
Short [Member] | Commodity contract - Power [Member] |  |
Derivative [Line Items] |  |
Non-monetary net notional amount (in MWh) | MWh | (108) | (109)
Short [Member] | Commodity contract - Natural gas [Member] |  |
Derivative [Line Items] |  |
Non-monetary net notional amount (in MMBtu) | MMBTU | 257 | 74
Short [Member] | Commodity contract - Oil [Member] |  |
Derivative [Line Items] |  |
Non-monetary net notional amount (in barrels) | bbl | (28) | (15)
FPL [Member] | Short [Member] | Commodity contract - Power [Member] |  |
Derivative [Line Items] |  |
Non-monetary net notional amount (in MWh) | MWh | 0 | 0
FPL [Member] | Short [Member] | Commodity contract - Oil [Member] |  |
Derivative [Line Items] |  |
Non-monetary net notional amount (in barrels) | bbl | 0 | 0
FPL [Member] | Long [Member] | Commodity contract - Natural gas [Member] |  |
Derivative [Line Items] |  |
Non-monetary net notional amount (in MMBtu) | MMBTU | 307 | 142

X
- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNonmonetaryNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition 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. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal energy measure used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
Namespace Prefix: | us-gaap_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix: | us-gaap_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CurrencySwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PositionAxis=us-gaap_ShortMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=nee_CommodityContractPowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=nee_CommodityContractNaturalGasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=nee_CommodityContractOilMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=nee_FloridaPowerLightCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PositionAxis=us-gaap_LongMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |