XML 105 R63.htm IDEA: XBRL DOCUMENT
v3.19.2

Debt and Credit Facilities (Summary of Debt Issuances) (Details) - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Debt Instrument [Line Items] |  |
Debt issuances | $ 3,800,000,000 |
Repayments of long-term debt | 2,155,000,000 | $ 2,190,000,000
Parent Company [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 1,800,000,000 |
Duke Energy Carolinas [Member] |  |
Debt Instrument [Line Items] |  |
Repayments of long-term debt | 3,000,000 | 702,000,000
Duke Energy Progress [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 600,000,000 |
Repayments of long-term debt | 602,000,000 |
Duke Energy Florida [Member] |  |
Debt Instrument [Line Items] |  |
Repayments of long-term debt | 136,000,000 | 635,000,000
Duke Energy Ohio [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 800,000,000 |
Repayments of long-term debt | 451,000,000 | $ 3,000,000
Duke Energy Ohio [Member] | April 2019 First Mortgage Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Repayments of long-term debt | 450,000,000 |
Piedmont Natural Gas [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 600,000,000 |
Repayments of long-term debt | 350,000,000 |
Piedmont Natural Gas [Member] | Senior Unsecured Term Loan Facility Due September 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Repayments of long-term debt | 350,000,000 |
Unsecured Debt [Member] | March 2019 Debt Issuance 3.250% Coupon Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 300,000,000 |
Interest rate | 3.251% |
Unsecured Debt [Member] | March 2019 Debt Issuance 3.227% Coupon Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 300,000,000 |
Interest rate | 3.227% |
Unsecured Debt [Member] | May 2019 Debt Issuance 3.500% Coupon Due 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 600,000,000 |
Interest rate | 3.50% |
Unsecured Debt [Member] | June 2019 Debt Issuance 3.400% Coupon Due 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 600,000,000 |
Interest rate | 3.40% |
Unsecured Debt [Member] | June 2019 Debt Issuance 4.200% Coupon Due 2049 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 600,000,000 |
Interest rate | 4.20% |
Unsecured Debt [Member] | Parent Company [Member] | March 2019 Debt Issuance 3.250% Coupon Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 300,000,000 |
Unsecured Debt [Member] | Parent Company [Member] | March 2019 Debt Issuance 3.227% Coupon Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 300,000,000 |
Unsecured Debt [Member] | Parent Company [Member] | May 2019 Debt Issuance 3.500% Coupon Due 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 0 |
Unsecured Debt [Member] | Piedmont Natural Gas [Member] | May 2019 Debt Issuance 3.500% Coupon Due 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 600,000,000 |
First Mortgage [Member] | January 2019 Debt Issuance 3.650% Coupon Due 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 400,000,000 |
Interest rate | 3.65% |
First Mortgage [Member] | January 2019 Debt Issuance 4.300% Coupon Due 2049 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 400,000,000 |
Interest rate | 4.30% |
First Mortgage [Member] | March 2019 Debt Issuance 3.450% Coupon Due 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 600,000,000 |
Interest rate | 3.45% |
First Mortgage [Member] | Duke Energy Progress [Member] | March 2019 Debt Issuance 3.450% Coupon Due 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 600,000,000 |
First Mortgage [Member] | Duke Energy Ohio [Member] | January 2019 Debt Issuance 3.650% Coupon Due 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | 400,000,000 |
First Mortgage [Member] | Duke Energy Ohio [Member] | January 2019 Debt Issuance 4.300% Coupon Due 2049 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 400,000,000 |

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
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_DukeEnergyProgressMember
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_DukeEnergyOhioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_April2019FirstMortgageBondsMember
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_DebtInstrumentAxis=duk_SeniorUnsecuredTermLoanFacilityDueSeptember2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_March2019DebtIssuanceDueMarch2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_March2019DebtIssuance3.227CouponDue2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_May2019DebtIssuance3.500CouponDue2029Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_June2019DebtIssuance3.400CouponDue2029Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_June2019DebtIssuance4.200CouponDue2049Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_January2019DebtIssuance3.650CouponDue2029Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_January2019DebtIssuance4.300CouponDue2049Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_March2019DebtIssuance3.450CouponDue2029Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |