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Debt and Credit Facilities (Narrative) (Details) - USD ($) | 1 Months Ended |
--- | --- | ---
May 31, 2019 | Jun. 30, 2019
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 3,800,000,000
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Facility size |  | 8,000,000,000
Duke Energy Carolinas [Member] | Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Facility size |  | 1,750,000,000
Duke Energy Carolinas [Member] | USDOJ [Member] | North Carolina Ash Basins [Member] | Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Minimum master credit facility balance required |  | 250,000,000
Duke Energy Progress [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | 600,000,000
Duke Energy Progress [Member] | Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Facility size |  | 1,250,000,000
Piedmont Natural Gas [Member] |  |
Debt Instrument [Line Items] |  |
Proceeds from Issuance of Debt | $ 600,000,000 |
Debt issuances |  | 600,000,000
Piedmont Natural Gas [Member] | Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Facility size |  | 500,000,000
Unsecured Debentures, June 2019 Issuance [Member] | Duke Energy Kentucky [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | 210,000,000
Unsecured Debentures, 3.23% Issuance [Member] | Duke Energy Kentucky [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 95,000,000
Interest rate |  | 3.23%
Unsecured Debentures, 3.56% Issuance [Member] | Duke Energy Kentucky [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 75,000,000
Interest rate |  | 3.56%
Unsecured Debentures, 4.32% Issuance [Member] | Duke Energy Kentucky [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 40,000,000
Interest rate |  | 4.32%
Debt Maturing October 2019, 4.650% Coupon [Member] | Duke Energy Kentucky [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuances |  | $ 100,000,000
Interest rate |  | 4.65%
Term Loan [Member] | Piedmont Natural Gas [Member] |  |
Debt Instrument [Line Items] |  |
Repayments of Debt | $ 350,000,000 |

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- 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
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- 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
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