XML 105 R64.htm IDEA: XBRL DOCUMENT
v3.22.1

Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details) Mcf in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) GWh Mcf | Dec. 31, 2021 USD ($) GWh Mcf
Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 3,490 | $ 3,592
Commodity contracts | Cash flow hedges |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 9,763 | 9,975
Commodity contracts | Electricity (GWh)(a) |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 16,176 | 22,344
Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 860 | 823
Designated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 2,913 | $ 2,415
Designated contracts | Interest Rate Contracts | VIE primary beneficiary |  |
Derivative [Line Items] |  |
Notional amount | 663 | 665
Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | 577 | 1,177
Duke Energy Carolinas | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 250 | $ 350
Duke Energy Carolinas | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 284 | 264
Duke Energy Carolinas | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 250 | $ 350
Progress Energy | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount |  | $ 500
Progress Energy | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 243 | 215
Progress Energy | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount |  | $ 500
Duke Energy Progress | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount |  | $ 500
Duke Energy Progress | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 243 | 215
Duke Energy Progress | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount |  | $ 500
Duke Energy Indiana | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 300 | $ 300
Duke Energy Indiana | Commodity contracts | Electricity (GWh)(a) |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 4,501 | 10,688
Duke Energy Indiana | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 7 | 8
Duke Energy Indiana | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 300 | $ 300
Duke Energy Ohio | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 27 | $ 27
Duke Energy Ohio | Commodity contracts | Electricity (GWh)(a) |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 791 | 1,681
Duke Energy Ohio | Undesignated contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 27 | $ 27
Piedmont | Commodity contracts | Natural gas (millions of dekatherms) |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of dekatherms) | Mcf | 326 | 336

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: | dtr-types: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: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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

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

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_ElectricTransmissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_GasDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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