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Organization and Basis of Presentation (Confirmed Obligations) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Duke Energy (Parent) |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | $ 87 | $ 19
Invoices confirmed during the period | 59 | 31
Confirmed invoices paid during the period | (94) | (31)
Confirmed obligations at end of period | 52 | 19
Duke Energy Carolinas |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | 6 |
Invoices confirmed during the period | 10 | 2
Confirmed invoices paid during the period | (9) | (1)
Confirmed obligations at end of period | 7 | 1
Progress Energy |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | 19 | 9
Invoices confirmed during the period | 22 | 11
Confirmed invoices paid during the period | (26) | (11)
Confirmed obligations at end of period | 15 | 9
Duke Energy Progress |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | 8 |
Invoices confirmed during the period | 11 | 2
Confirmed invoices paid during the period | (13) | (1)
Confirmed obligations at end of period | 6 | 1
Duke Energy Florida |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | 11 | 9
Invoices confirmed during the period | 11 | 9
Confirmed invoices paid during the period | (13) | (10)
Confirmed obligations at end of period | 9 | 8
Duke Energy Ohio |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | 5 | 6
Invoices confirmed during the period | 1 | 6
Confirmed invoices paid during the period | (6) | (8)
Confirmed obligations at end of period |  | 4
Duke Energy Indiana |  |
Contractual Obligations [Roll Forward] |  |
Invoices confirmed during the period |  | 2
Confirmed invoices paid during the period |  | (1)
Confirmed obligations at end of period |  | 1
Piedmont |  |
Contractual Obligations [Roll Forward] |  |
Confirmed obligations at beginning of period | 57 | 4
Invoices confirmed during the period | 25 | 11
Confirmed invoices paid during the period | (53) | (10)
Confirmed obligations at end of period | $ 29 | $ 5

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