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Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Master Credit Facility - USD ($) | Mar. 31, 2022 | Mar. 31, 2021
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Facility size | $ 9,000,000,000 | $ 8,000,000,000
Commercial paper | (2,819,000,000) |
Outstanding letters of credit | (38,000,000) |
Tax-exempt bonds | (81,000,000) |
Available capacity under the Master Credit Facility | 6,062,000,000 |
Duke Energy Carolinas |  |
Line of Credit Facility [Line Items] |  |
Facility size | 1,225,000,000 |
Commercial paper | (300,000,000) |
Outstanding letters of credit | (4,000,000) |
Available capacity under the Master Credit Facility | 921,000,000 |
Duke Energy Progress |  |
Line of Credit Facility [Line Items] |  |
Facility size | 1,400,000,000 |
Commercial paper | (150,000,000) |
Outstanding letters of credit | (2,000,000) |
Available capacity under the Master Credit Facility | 1,248,000,000 |
Duke Energy Florida |  |
Line of Credit Facility [Line Items] |  |
Facility size | 900,000,000 |
Commercial paper | (236,000,000) |
Outstanding letters of credit | (7,000,000) |
Available capacity under the Master Credit Facility | 657,000,000 |
Duke Energy Ohio |  |
Line of Credit Facility [Line Items] |  |
Facility size | 775,000,000 |
Commercial paper | (86,000,000) |
Available capacity under the Master Credit Facility | 689,000,000 |
Duke Energy Indiana |  |
Line of Credit Facility [Line Items] |  |
Facility size | 600,000,000 |
Commercial paper | (150,000,000) |
Tax-exempt bonds | (81,000,000) |
Available capacity under the Master Credit Facility | 369,000,000 |
Piedmont |  |
Line of Credit Facility [Line Items] |  |
Facility size | 800,000,000 |
Commercial paper | (182,000,000) |
Available capacity under the Master Credit Facility | 618,000,000 |
Duke Energy (Parent) | Proceeds loaned to subsidiary registrants |  |
Line of Credit Facility [Line Items] |  |
Commercial paper | (625,000,000) |
Duke Energy (Parent) | Duke Energy (Parent) |  |
Line of Credit Facility [Line Items] |  |
Facility size | 3,300,000,000 |
Commercial paper | (1,715,000,000) |
Outstanding letters of credit | (25,000,000) |
Available capacity under the Master Credit Facility | $ 1,560,000,000 |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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