XML 98 R56.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Debt and Credit Facilities (Summary of Debt Issuances) (Details) - USD ($) | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | $ 2,750,000,000 |  |
Current maturities of long-term debt |  | 2,852,000,000 |  | $ 3,244,000,000
Repayments of Long-term Debt |  | 2,190,000,000 | $ 1,009,000,000 |
Parent Company [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 750,000,000 |  |
Duke Energy Carolinas [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 1,000,000,000 |  |
Current maturities of long-term debt |  | 505,000,000 |  | 1,205,000,000
Repayments of Long-term Debt |  | 702,000,000 | 114,000,000 |
Duke Energy Carolinas [Member] | First Mortgage Bonds Maturing April 2018, 5.100% Coupon |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of Long-term Debt | $ 300,000,000 |  |  |
Duke Energy Florida [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 1,000,000,000 |  |
Current maturities of long-term debt |  | 269,000,000 |  | $ 768,000,000
Repayments of Long-term Debt |  | 635,000,000 | $ 57,000,000 |
Unsecured Debt [Member] | March 2018 Debt Issuance 3.950% Coupon Due 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | $ 250,000,000 |  |
Interest rate |  | 3.95% |  |
Unsecured Debt [Member] | May 2018 Debt Issuance 2.830% Coupon Due 2021 [Member] [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | $ 500,000,000 |  |
Interest rate |  | 2.83% |  |
Unsecured Debt [Member] | Parent Company [Member] | March 2018 Debt Issuance 3.950% Coupon Due 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | $ 250,000,000 |  |
Unsecured Debt [Member] | Parent Company [Member] | May 2018 Debt Issuance 2.830% Coupon Due 2021 [Member] [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 500,000,000 |  |
First Mortgage [Member] | March 2018 Debt Issuance 3.050% Coupon Due 2023 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | $ 500,000,000 |  |
Interest rate |  | 3.05% |  |
First Mortgage [Member] | March 2018 Debt Issuance 3.950% Coupon Due 2048 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | $ 500,000,000 |  |
Interest rate |  | 3.95% |  |
First Mortgage [Member] | June 2018 Debt issuance 3.80% coupon Due 2028 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | $ 600,000,000 |  |
Interest rate |  | 3.80% |  |
First Mortgage [Member] | June 2018 Debt Issuance 4.20 Coupon Due 2048 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | $ 400,000,000 |  |
Interest rate |  | 4.20% |  |
First Mortgage [Member] | Duke Energy Carolinas [Member] | March 2018 Debt Issuance 3.050% Coupon Due 2023 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | $ 500,000,000 |  |
First Mortgage [Member] | Duke Energy Carolinas [Member] | March 2018 Debt Issuance 3.950% Coupon Due 2048 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 500,000,000 |  |
First Mortgage [Member] | Duke Energy Florida [Member] | June 2018 Debt issuance 3.80% coupon Due 2028 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 600,000,000 |  |
First Mortgage [Member] | Duke Energy Florida [Member] | June 2018 Debt Issuance 4.20 Coupon Due 2048 [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 Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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=109223946&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: | us-gaap_DebtInstrumentAxis=duk_FirstMortgageBondsMaturingApril20185.100CouponMember
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: | us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
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_May2018DebtIssuance2.830CouponDue2021MemberMember
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_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: |