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Organization and Basis of Presentation (Confirmed Obligations) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Duke Energy (Parent) |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | $ 40 | $ 46 | $ 87 | $ 19
Invoices confirmed during the period | 47 | 86 | 161 | 181
Confirmed invoices paid during the period | (18) | (58) | (179) | (126)
Confirmed obligations at end of period | 69 | 74 | 69 | 74
Duke Energy Carolinas |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 5 | 9 | 6 |
Invoices confirmed during the period | 2 | 6 | 22 | 20
Confirmed invoices paid during the period | (4) | (12) | (25) | (17)
Confirmed obligations at end of period | 3 | 3 | 3 | 3
Progress Energy |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 14 | 11 | 19 | 9
Invoices confirmed during the period | 11 | 21 | 53 | 52
Confirmed invoices paid during the period | (8) | (15) | (55) | (44)
Confirmed obligations at end of period | 17 | 17 | 17 | 17
Duke Energy Progress |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 12 | 3 | 8 |
Invoices confirmed during the period | 2 | 7 | 25 | 17
Confirmed invoices paid during the period | (3) | (5) | (22) | (12)
Confirmed obligations at end of period | 11 | 5 | 11 | 5
Duke Energy Florida |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 2 | 8 | 11 | 9
Invoices confirmed during the period | 9 | 14 | 28 | 35
Confirmed invoices paid during the period | (5) | (10) | (33) | (32)
Confirmed obligations at end of period | 6 | 12 | 6 | 12
Duke Energy Ohio |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 2 | 9 | 5 | 6
Invoices confirmed during the period | 4 | 12 | 7 | 27
Confirmed invoices paid during the period |  | (9) | (6) | (21)
Confirmed obligations at end of period | 6 | 12 | 6 | 12
Duke Energy Indiana |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Invoices confirmed during the period |  |  |  | 1
Confirmed invoices paid during the period |  |  |  | (1)
Piedmont |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 19 | 17 | 57 | 4
Invoices confirmed during the period | 30 | 47 | 79 | 81
Confirmed invoices paid during the period | (6) | (22) | (93) | (43)
Confirmed obligations at end of period | $ 43 | $ 42 | $ 43 | $ 42

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