XML 88 R101.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Debt and Credit Facilities (Summary of Debt Issuances) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |
Debt issuances | $ 6,210,000,000 | $ 5,050,000,000 |
Redemption of long-term debt | $ 3,476,000,000 | $ 2,906,000,000 | $ 2,316,000,000
March 2019 Debt Issuance Due March 2022 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 2.538% |  |
Debt issuances | $ 300,000,000 |  |
March 2019 Debt Issuance 3.227% Coupon Due 2022 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 3.227% |  |
Debt issuances | $ 300,000,000 |  |
May 2019 Debt Issuance 3.500% Coupon Due 2029 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 3.50% |  |
Debt issuances | $ 600,000,000 |  |
June 2019 Debt Issuance 3.400% Coupon Due 2029 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 3.40% |  |
Debt issuances | $ 600,000,000 |  |
June 2019 Debt Issuance 4.200% Coupon Due 2049 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 4.20% |  |
Debt issuances | $ 600,000,000 |  |
July 2019 Debt Issuance 4.320% Coupon Due 2049 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 4.32% |  |
Debt issuances | $ 40,000,000 |  |
September 2019 Debt Issuance 3.230% Coupon Due 2025 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 3.23% |  |
Debt issuances | $ 95,000,000 |  |
September 2019 Debt Issuance 3.560% Coupon Due 2029 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 3.56% |  |
Debt issuances | $ 75,000,000 |  |
November 2019 Debt Issuance 2.167% Coupon Due 2021 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 2.167% |  |
Debt issuances | $ 200,000,000 |  |
January 2019 Debt Issuance 3.650% Coupon Due 2029 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 3.65% |  |
Debt issuances | $ 400,000,000 |  |
January 2019 Debt Issuance 4.300% Coupon Due 2049 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 4.30% |  |
Debt issuances | $ 400,000,000 |  |
March 2019 Debt Issuance 3.450% Coupon Due 2029 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 3.45% |  |
Debt issuances | $ 600,000,000 |  |
August 2019 Debt Issuance 2.450% Coupon Due 2029 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 2.45% |  |
Debt issuances | $ 450,000,000 |  |
August 2019 Debt Issuance 3.200% Coupon Due 2049 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 3.20% |  |
Debt issuances | $ 350,000,000 |  |
September 2019 Debt Issuance 3.250% Coupon Due 2049 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 3.25% |  |
Debt issuances | $ 500,000,000 |  |
November 2019 Debt Issuance 2.500% Coupon Due 2029 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 2.50% |  |
November 2019 Debt Issuance 2.500% Coupon Due 2029 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | $ 700,000,000 |  |
March 2018 Debt Issuance 3.950% Coupon Due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 3.95% |
March 2018 Debt Issuance 3.950% Coupon Due 2025 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 250,000,000 |
May 2018 Debt Issuance 3.114% Coupon Due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 3.114% |
May 2018 Debt Issuance 3.114% Coupon Due 2021 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 500,000,000 |
September 2018 Debt Issuance 5.625% Coupon Due 2078 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 5.625% |
September 2018 Debt Issuance 5.625% Coupon Due 2078 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 500,000,000 |
March 2018 Debt Issuance 3.050% Coupon Due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 3.05% |
March 2018 Debt Issuance 3.050% Coupon Due 2023 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 500,000,000 |
March 2018 Debt Issuance 3.950% Coupon Due 2048 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 3.95% |
March 2018 Debt Issuance 3.950% Coupon Due 2048 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 500,000,000 |
June 2018 Debt issuance 3.80% coupon Due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 3.80% |
June 2018 Debt issuance 3.80% coupon Due 2028 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 600,000,000 |
June 2018 Debt Issuance 4.20 Coupon Due 2048 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 4.20% |
June 2018 Debt Issuance 4.20 Coupon Due 2048 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 400,000,000 |
August 2018 Debt Issuance 3.375% Coupon Due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 3.375% |
August 2018 Debt Issuance 3.375% Coupon Due 2023 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 300,000,000 |
August 2018 Debt Issuance 3.700% Coupon Due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 3.70% |
August 2018 Debt Issuance 3.700% Coupon Due 2028 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 500,000,000 |
November 2018 Debt Issuance 3.350% Coupon Due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 3.35% |
November 2018 Debt Issuance 3.350% Coupon Due 2022 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 350,000,000 |
November 2018 Debt Issuance 3.950% Coupon Due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 3.95% |
November 2018 Debt Issuance 3.950% Coupon Due 2028 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | $ 650,000,000 |
Parent Company |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 1,800,000,000 | 1,250,000,000 |
Parent Company | March 2019 Debt Issuance Due March 2022 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 300,000,000 |  |
Parent Company | March 2019 Debt Issuance 3.227% Coupon Due 2022 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 300,000,000 |  |
Parent Company | June 2019 Debt Issuance 3.400% Coupon Due 2029 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 600,000,000 |  |
Parent Company | June 2019 Debt Issuance 4.200% Coupon Due 2049 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 600,000,000 |  |
Parent Company | March 2018 Debt Issuance 3.950% Coupon Due 2025 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | 250,000,000 |
Parent Company | May 2018 Debt Issuance 3.114% Coupon Due 2021 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | 500,000,000 |
Parent Company | September 2018 Debt Issuance 5.625% Coupon Due 2078 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | 500,000,000 |
Duke Energy Carolinas |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 800,000,000 | 2,000,000,000 |
Redemption of long-term debt | 6,000,000 | 1,205,000,000 | 116,000,000
Duke Energy Carolinas | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | 350,000,000 |
Duke Energy Carolinas | August 2019 Debt Issuance 2.450% Coupon Due 2029 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 450,000,000 |  |
Duke Energy Carolinas | August 2019 Debt Issuance 3.200% Coupon Due 2049 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 350,000,000 |  |
Duke Energy Carolinas | March 2018 Debt Issuance 3.050% Coupon Due 2023 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | 500,000,000 |
Duke Energy Carolinas | March 2018 Debt Issuance 3.950% Coupon Due 2048 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | 500,000,000 |
Duke Energy Carolinas | November 2018 Debt Issuance 3.950% Coupon Due 2028 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | 650,000,000 |
Duke Energy Carolinas | First Mortgage Bonds Maturing April 2018, 5.100% Coupon |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of debt |  | 300,000,000 |
Duke Energy Progress |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 600,000,000 | 800,000,000 |
Redemption of long-term debt | 605,000,000 | 3,000,000 | 470,000,000
Duke Energy Progress | March 2019 Debt Issuance 3.450% Coupon Due 2029 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 600,000,000 |  |
Duke Energy Progress | August 2018 Debt Issuance 3.375% Coupon Due 2023 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | 300,000,000 |
Duke Energy Progress | August 2018 Debt Issuance 3.700% Coupon Due 2028 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | 500,000,000 |
Duke Energy Florida |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 900,000,000 | 1,000,000,000 |
Redemption of long-term debt | 262,000,000 | 769,000,000 | 342,000,000
Duke Energy Florida | November 2019 Debt Issuance 2.167% Coupon Due 2021 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 200,000,000 |  |
Duke Energy Florida | March 2019 Debt Issuance 3.450% Coupon Due 2029 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 0 |  |
Duke Energy Florida | November 2019 Debt Issuance 2.500% Coupon Due 2029 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 700,000,000 |  |
Duke Energy Florida | June 2018 Debt issuance 3.80% coupon Due 2028 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | 600,000,000 |
Duke Energy Florida | June 2018 Debt Issuance 4.20 Coupon Due 2048 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances |  | 400,000,000 |
Duke Energy Ohio |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 1,010,000,000 |  |
Redemption of long-term debt | 551,000,000 | 3,000,000 | 2,000,000
Duke Energy Ohio | July 2019 Debt Issuance 4.320% Coupon Due 2049 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 40,000,000 |  |
Duke Energy Ohio | September 2019 Debt Issuance 3.230% Coupon Due 2025 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 95,000,000 |  |
Duke Energy Ohio | September 2019 Debt Issuance 3.560% Coupon Due 2029 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 75,000,000 |  |
Duke Energy Ohio | January 2019 Debt Issuance 3.650% Coupon Due 2029 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 400,000,000 |  |
Duke Energy Ohio | January 2019 Debt Issuance 4.300% Coupon Due 2049 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 400,000,000 |  |
Duke Energy Ohio | April 2019 First Mortgage Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Redemption of long-term debt | 450,000,000 |  |
Duke Energy Ohio | Debentures Due October 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption of long-term debt | 100,000,000 |  |
Duke Energy Indiana |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 500,000,000 |  |
Redemption of long-term debt | 213,000,000 | $ 3,000,000 | 5,000,000
Duke Energy Indiana | September 2019 Debt Issuance 3.250% Coupon Due 2049 | First Mortgage |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 500,000,000 |  |
Duke Energy Indiana | Pollution Control Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Redemption of long-term debt | 150,000,000 |  |
Piedmont |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 600,000,000 |  |
Redemption of long-term debt | 350,000,000 |  | $ 35,000,000
Piedmont | May 2019 Debt Issuance 3.500% Coupon Due 2029 | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuances | 600,000,000 |  |
Piedmont | Senior Unsecured Term Loan Facility Due September 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption of long-term debt | $ 350,000,000 |  |

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 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=118932676&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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: | us-gaap_DebtInstrumentAxis=duk_March2019DebtIssuanceDueMarch2022Member
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_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_DebtInstrumentAxis=duk_July2019DebtIssuance4.320CouponDue2049Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_September2019DebtIssuance3.230CouponDue2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_September2019DebtIssuance3.560CouponDue2029Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_November2019DebtIssuance2.167CouponDue2021Member
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_LongtermDebtTypeAxis=us-gaap_FirstMortgageMember
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: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_August2019DebtIssuance2.450CouponDue2029Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_August2019DebtIssuance3.200CouponDue2049Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_September2019DebtIssuance3.250CouponDue2049Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_November2019DebtIssuance2.500CouponDue2029Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_March2018DebtIssuance3.950CouponDue2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_May2018DebtIssuance3.114CouponDue2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_September2018DebtIssuance5.625CouponDue2078Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_March2018DebtIssuance3.050CouponDue2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_March2018DebtIssuance3.950CouponDue2048Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_June2018Debtissuance3.80couponDue2028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_June2018DebtIssuance4.20CouponDue2048Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_August2018DebtIssuance3.375CouponDue2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_August2018DebtIssuance3.700CouponDue2028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_November2018DebtIssuance3.350CouponDue2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=duk_November2018DebtIssuance3.950CouponDue2028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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: | us-gaap_DebtInstrumentAxis=duk_FirstMortgageBondsMaturingApril20185.100CouponMember
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: | us-gaap_DebtInstrumentAxis=duk_DebenturesDueOctober2019Member
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: | us-gaap_DebtInstrumentAxis=duk_PollutionControlBondsMember
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: |