XML 153 R96.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Debt and Credit Facilities (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Demand notes, maximum amount available for sale |  |  | $ 3,000,000,000 |  |  |
Demand notes, maximum amount outstanding |  |  | 1,500,000,000 |  |  |
Principal amount of demand notes |  |  | 1,066,000,000 |  | $ 1,168,000,000 |
Other loans outstanding against cash surrender value of life insurance policies |  |  | 819,000,000 |  | 817,000,000 |
Duke Energy Progress |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Other loans outstanding against cash surrender value of life insurance policies |  |  | $ 34,000,000 |  | $ 35,000,000 |
Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  | 0.65 |  |  |
Maximum | Duke Energy Ohio |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  | 0.65 |  |  |
Maximum | Duke Energy Indiana |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  | 0.65 |  |  |
Maximum | Duke Energy Progress |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  | 0.65 |  |  |
Maximum | Progress Energy |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  | 0.65 |  |  |
Maximum | Duke Energy Carolinas |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  | 0.65 |  |  |
Maximum | Duke Energy Florida |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  | 0.65 |  |  |
Maximum | Piedmont |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  | 0.70 |  |  |
Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Facility size |  |  | $ 8,000,000,000 | $ 8,000,000,000 |  |
Revolving Credit Facility | Duke Energy Ohio |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Facility size |  |  | 775,000,000 |  |  |
Revolving Credit Facility | Duke Energy Indiana |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Facility size |  |  | 600,000,000 |  |  |
Revolving Credit Facility | Duke Energy Progress |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Facility size |  |  | 1,150,000,000 |  |  |
Revolving Credit Facility | Duke Energy Carolinas |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Facility size |  |  | 1,225,000,000 |  |  |
Revolving Credit Facility | Duke Energy Florida |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Facility size |  |  | 900,000,000 |  |  |
Revolving Credit Facility | Piedmont |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Facility size |  |  | 700,000,000 |  |  |
Revolving Credit Facility | Line of Credit | Duke Energy Ohio |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Facility size | $ 100,000,000 |  |  |  |  |
Term of debt instrument | 2 years |  |  |  |  |
Revolving Credit Facility | Line of Credit | Duke Energy Indiana |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Facility size | $ 300,000,000 |  |  |  |  |
Term of debt instrument | 2 years |  |  |  |  |
Revolving Credit Facility | Line of Credit | Duke Energy Kentucky |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Facility size | $ 50,000,000 |  |  |  |  |
Term of debt instrument | 2 years |  |  |  |  |
Revolving Credit Facility | Line of Credit | Progress Energy |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Facility size |  |  | 2,500,000,000 |  |  |
June 2017 Three Year Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Facility size |  |  | $ 1,000,000,000 |  |  |
Term of debt instrument |  |  | 3 years |  |  |
Long-term line of credit |  |  | $ 500,000,000 |  |  | $ 500,000,000
Repayments of debt |  | $ 500,000,000 |  |  |  |

X
- Definition Maximum amount of unsecured variable denomination floating rate demand notes available for sale. + References No definition available. + Details
Name: | duk_UnsecuredVariableDenominationFloatingRateDemandNotesAmountAvailableForSale
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum amount of unsecured variable denomination floating rate demand notes that can be outstanding at any point in time. + References No definition available. + Details
Name: | duk_UnsecuredVariableDenominationFloatingRateDemandNotesMaximumAmountOutstanding
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Principal amount of unsecured variable denomination floating rate demand notes that are outstanding at the balance sheet date. + References No definition available. + Details
Name: | duk_UnsecuredVariableDenominationFloatingRateDemandNotesPrincipalAmountOutstanding
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term loans payable classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_OtherLoansPayable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Indebtedness divided by net capital. + References No definition available. + Details
Name: | us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
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_DukeEnergyIndianaMember
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_DukeEnergyCarolinasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=duk_DukeEnergyFloridaMember
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: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_CreditFacilityAxis=duk_June2017ThreeYearRevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |