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Organization and Basis of Presentation (Confirmed Obligations) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Duke Energy (Parent) |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | $ 52 | $ 19 | $ 87 | $ 19
Invoices confirmed during the period | 55 | 64 | 114 | 95
Confirmed invoices paid during the period | (67) | (37) | (161) | (68)
Confirmed obligations at end of period | 40 | 46 | 40 | 46
Duke Energy Carolinas |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 7 | 1 | 6 |
Invoices confirmed during the period | 10 | 12 | 20 | 14
Confirmed invoices paid during the period | (12) | (4) | (21) | (5)
Confirmed obligations at end of period | 5 | 9 | 5 | 9
Progress Energy |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 15 | 9 | 19 | 9
Invoices confirmed during the period | 20 | 20 | 42 | 31
Confirmed invoices paid during the period | (21) | (18) | (47) | (29)
Confirmed obligations at end of period | 14 | 11 | 14 | 11
Duke Energy Progress |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 6 | 1 | 8 |
Invoices confirmed during the period | 12 | 8 | 23 | 10
Confirmed invoices paid during the period | (6) | (6) | (19) | (7)
Confirmed obligations at end of period | 12 | 3 | 12 | 3
Duke Energy Florida |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 9 | 8 | 11 | 9
Invoices confirmed during the period | 8 | 12 | 19 | 21
Confirmed invoices paid during the period | (15) | (12) | (28) | (22)
Confirmed obligations at end of period | 2 | 8 | 2 | 8
Duke Energy Ohio |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period |  | 4 | 5 | 6
Invoices confirmed during the period | 2 | 9 | 3 | 15
Confirmed invoices paid during the period |  | (4) | (6) | (12)
Confirmed obligations at end of period | 2 | 9 | 2 | 9
Duke Energy Indiana |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period |  | 1 |  |
Invoices confirmed during the period |  | (1) |  | 1
Confirmed invoices paid during the period |  |  |  | (1)
Piedmont |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 29 | 5 | 57 | 4
Invoices confirmed during the period | 24 | 23 | 49 | 34
Confirmed invoices paid during the period | (34) | (11) | (87) | (21)
Confirmed obligations at end of period | $ 19 | $ 17 | $ 19 | $ 17

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