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Debt and Credit Facilities (Narrative) (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 27, 2020 | Mar. 19, 2020 | Aug. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  | $ 3,468,000,000 | $ 2,737,000,000 |
Duke Energy Progress |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  | 985,000,000 | $ 603,000,000 |
Master Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Facility size |  |  |  | $ 8,000,000,000 | 8,000,000,000 |  | $ 8,000,000,000
Master Credit Facility | Duke Energy (Parent) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  | 500,000,000 |  |
Master Credit Facility | Duke Energy Progress |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Facility size |  |  |  | 1,250,000,000 | $ 1,250,000,000 |  |
Term Loan Facility | 364-day Term Loan Credit Agreement | Duke Energy (Parent) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Facility size |  |  |  |  |  |  | 1,500,000,000
Borrowing amount | $ 188,000,000 | $ 1,500,000,000 |  |  |  |  |
Increase in borrowing limit |  |  |  |  |  |  | $ 500,000,000
Repayments of long-term debt |  |  |  | $ 844,000,000 |  |  |
Term Loan Facility | Two-year term loan facility | Duke Energy Progress |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  | $ 700,000,000 |  |  |  |
Facility term |  |  | 2 years |  |  |  |

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- 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
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- 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
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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