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Organization and Basis of Presentation (Accounts Payable Finance Program) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Duke Energy (Parent) |  |  |  |
Supplier Finance Program, Obligation [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | $ 18 | $ 76 | $ 13 | $ 50
Invoices confirmed during the period | 14 | 63 | 32 | 120
Confirmed invoices paid during the period | (20) | (111) | (33) | (142)
Confirmed obligations at end of period | 12 | 28 | 12 | 28
Piedmont |  |  |  |
Supplier Finance Program, Obligation [Roll Forward] |  |  |  |
Confirmed obligations at beginning of period | 18 | 74 | 12 | 47
Invoices confirmed during the period | 12 | 63 | 30 | 119
Confirmed invoices paid during the period | (18) | (109) | (30) | (138)
Confirmed obligations at end of period | $ 12 | $ 28 | $ 12 | $ 28

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