XML 167 R110.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Investments in Unconsolidated Affiliates (Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) asset MW | Dec. 31, 2019 USD ($)
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Distributions from equity investments | $ 80 | $ 37 | $ 55
Distributions from equity investments, return of capital | $ 44 | $ 133 | 11
Electric Utilities and Infrastructure | DATC |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest | 50.00% |  |
Electric Utilities and Infrastructure | Pioneer |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest | 50.00% |  |
Gas Utilities and Infrastructure | Sabal Trail |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest | 7.50% |  |
Gas Utilities and Infrastructure | Constitution |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest | 24.00% |  |
Impairment losses |  |  | $ 25
Gas Utilities and Infrastructure | ACP |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest | 47.00% |  |
Gas Utilities and Infrastructure | SustainRNG |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest | 29.68% |  |
Gas Utilities and Infrastructure | Sustain T&W |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest | 70.00% |  |
Commercial Renewables | Non-consolidated VIEs |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Number of cell projects | asset |  | 70 |
Capacity of assets | MW |  | 43 |
Commercial Renewables | DS Cornerstone |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest | 26.00% |  | 50.00%
Other | NMC |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest | 17.50% |  |
Board representation and voting rights, ownership percentage | 25.00% |  |
Piedmont |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Distributions from equity investments | $ 8 | $ 2 | $ 1
Distributions from equity investments, return of capital | $ 2 | $ 2 | $ 4
Piedmont | Gas Utilities and Infrastructure | Cardinal |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest | 21.49% |  |
Piedmont | Gas Utilities and Infrastructure | Pine Needle |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest | 45.00% |  |
Piedmont | Gas Utilities and Infrastructure | Hardy Storage |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest | 50.00% |  |

X
- Definition Capacity of Assets + References No definition available. + Details
Name: | duk_CapacityOfAssets
Namespace Prefix: | duk_
Data Type: | dtr-types:powerItemType
Balance Type: | na
Period Type: | instant

X
- Definition EquityMethodInvestmentVotingRightsOwnershipPercentage + References No definition available. + Details
Name: | duk_EquityMethodInvestmentVotingRightsOwnershipPercentage
Namespace Prefix: | duk_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Cell Projects + References No definition available. + Details
Name: | duk_NumberOfCellProjects
Namespace Prefix: | duk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21D -URI http://asc.fasb.org/extlink&oid=123570139&loc=SL94080555-108585 + Details
Name: | us-gaap_EquityMethodInvestmentDividendsOrDistributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=124260329&loc=SL6284422-111562 + Details
Name: | us-gaap_ImpairmentOfInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21D -URI http://asc.fasb.org/extlink&oid=123570139&loc=SL94080555-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=duk_ElectricUtilitiesandInfrastructureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=duk_DukeAmericanTransmissionCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=duk_PioneerTransmissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=duk_GasUtilitiesandInfrastructureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=duk_SabalTrailTransmissionPipelineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=duk_ConstitutionPipelineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=duk_AtlanticCoastPipelineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=duk_SustainRNGMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=duk_SustainTWMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=duk_CommercialRenewablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=duk_DSCornerstoneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=duk_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=duk_NationalMethanolCompanyMember
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: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=duk_CardinalPipelineCompanyLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=duk_PineNeedleLNGCompanyLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=duk_HardyStorageCompanyLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |