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Organization and Basis of Presentation (Confirmed Obligations) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Duke Energy (Parent) |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | $ 13 | $ 50
Invoices confirmed during the period | 18 | 57
Confirmed invoices paid during the period | (13) | (31)
Confirmed obligations at end of period | 18 | 76
Progress Energy |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | 1 | 3
Invoices confirmed during the period | 0 | 1
Confirmed invoices paid during the period | (1) | (2)
Confirmed obligations at end of period | 0 | 2
Duke Energy Florida |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | 1 | 3
Invoices confirmed during the period | 0 | 1
Confirmed invoices paid during the period | (1) | (2)
Confirmed obligations at end of period | 0 | 2
Piedmont |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | 12 | 47
Invoices confirmed during the period | 18 | 56
Confirmed invoices paid during the period | (12) | (29)
Confirmed obligations at end of period | $ 18 | $ 74

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- Definition Increase (Decrease) In Contractual Obligation + References No definition available. + Details
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- Definition Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 + Details
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