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Organization and Basis of Presentation (Confirmed Obligations) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Duke Energy (Parent) |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | $ 50 | $ 87
Invoices confirmed during the period | 57 | 59
Confirmed invoices paid during the period | (31) | (94)
Confirmed obligations at end of period | 76 | 52
Duke Energy Carolinas |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | 0 | 6
Invoices confirmed during the period | 0 | 10
Confirmed invoices paid during the period | 0 | (9)
Confirmed obligations at end of period | 0 | 7
Progress Energy |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | 3 | 19
Invoices confirmed during the period | 1 | 22
Confirmed invoices paid during the period | (2) | (26)
Confirmed obligations at end of period | 2 | 15
Duke Energy Progress |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | 0 | 8
Invoices confirmed during the period | 0 | 11
Confirmed invoices paid during the period | 0 | (13)
Confirmed obligations at end of period | 0 | 6
Duke Energy Florida |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | 3 | 11
Invoices confirmed during the period | 1 | 11
Confirmed invoices paid during the period | (2) | (13)
Confirmed obligations at end of period | 2 | 9
Duke Energy Ohio |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | 0 | 5
Invoices confirmed during the period | 0 | 1
Confirmed invoices paid during the period | 0 | (6)
Confirmed obligations at end of period | 0 | 0
Duke Energy Indiana |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | 0 | 0
Invoices confirmed during the period | 0 | 0
Confirmed invoices paid during the period | 0 | 0
Confirmed obligations at end of period | 0 | 0
Piedmont |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | 47 | 57
Invoices confirmed during the period | 56 | 25
Confirmed invoices paid during the period | (29) | (53)
Confirmed obligations at end of period | $ 74 | $ 29

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