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Organization and Basis of Presentation (Confirmed Obligations) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Duke Energy (Parent) |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | $ 76 | $ 52 | $ 50 | $ 87
Invoices confirmed during the period | 63 | 55 | 120 | 114
Confirmed invoices paid during the period | (111) | (67) | (142) | (161)
Confirmed obligations at end of period | 28 | 40 | 28 | 40
Duke Energy Carolinas |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 0 | 7 | 0 | 6
Invoices confirmed during the period | 0 | 10 | 0 | 20
Confirmed invoices paid during the period | 0 | (12) | 0 | (21)
Confirmed obligations at end of period | 0 | 5 | 0 | 5
Progress Energy |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 2 | 15 | 3 | 19
Invoices confirmed during the period | 0 | 20 | 1 | 42
Confirmed invoices paid during the period | (2) | (21) | (4) | (47)
Confirmed obligations at end of period | 0 | 14 | 0 | 14
Duke Energy Progress |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 0 | 6 | 0 | 8
Invoices confirmed during the period | 0 | 12 | 0 | 23
Confirmed invoices paid during the period | 0 | (6) | 0 | (19)
Confirmed obligations at end of period | 0 | 12 | 0 | 12
Duke Energy Florida |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 2 | 9 | 3 | 11
Invoices confirmed during the period | 0 | 8 | 1 | 19
Confirmed invoices paid during the period | (2) | (15) | (4) | (28)
Confirmed obligations at end of period | 0 | 2 | 0 | 2
Duke Energy Ohio |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 0 | 0 | 0 | 5
Invoices confirmed during the period | 0 | 2 | 0 | 3
Confirmed invoices paid during the period | 0 | 0 | 0 | (6)
Confirmed obligations at end of period | 0 | 2 | 0 | 2
Duke Energy Indiana |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 0 | 0 | 0 | 0
Invoices confirmed during the period | 0 | 0 | 0 | 0
Confirmed invoices paid during the period | 0 | 0 | 0 | 0
Confirmed obligations at end of period | 0 | 0 | 0 | 0
Piedmont |  |  |  |
Contractual Obligations [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 74 | 29 | 47 | 57
Invoices confirmed during the period | 63 | 24 | 119 | 49
Confirmed invoices paid during the period | (109) | (34) | (138) | (87)
Confirmed obligations at end of period | $ 28 | $ 19 | $ 28 | $ 19

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