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Summary of Significant Accounting Policies (Accounts Payable and Supplier Invoices Sold) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Payables [Line Items] |  |
Confirmed obligations outstanding at beginning of period | $ 50 | $ 87
Invoices confirmed during the period | 156 | 228
Confirmed invoices paid during the period | (193) | (265)
Confirmed obligations outstanding at end of period | 13 | 50
Duke Energy Carolinas |  |
Payables [Line Items] |  |
Confirmed obligations outstanding at beginning of period | 0 | 6
Invoices confirmed during the period | 0 | 24
Confirmed invoices paid during the period | 0 | (30)
Confirmed obligations outstanding at end of period | 0 | 0
Progress Energy |  |
Payables [Line Items] |  |
Confirmed obligations outstanding at beginning of period | 3 | 19
Invoices confirmed during the period | 4 | 58
Confirmed invoices paid during the period | (6) | (74)
Confirmed obligations outstanding at end of period | 1 | 3
Duke Energy Progress |  |
Payables [Line Items] |  |
Confirmed obligations outstanding at beginning of period | 0 | 8
Invoices confirmed during the period | 0 | 22
Confirmed invoices paid during the period | 0 | (30)
Confirmed obligations outstanding at end of period | 0 | 0
Duke Energy Florida |  |
Payables [Line Items] |  |
Confirmed obligations outstanding at beginning of period | 3 | 11
Invoices confirmed during the period | 4 | 36
Confirmed invoices paid during the period | (6) | (44)
Confirmed obligations outstanding at end of period | 1 | 3
Duke Energy Ohio |  |
Payables [Line Items] |  |
Confirmed obligations outstanding at beginning of period | 0 | 5
Invoices confirmed during the period | 0 | 7
Confirmed invoices paid during the period | 0 | (12)
Confirmed obligations outstanding at end of period | 0 | 0
Duke Energy Indiana |  |
Payables [Line Items] |  |
Invoices confirmed during the period |  | 0
Confirmed invoices paid during the period |  | 0
Piedmont |  |
Payables [Line Items] |  |
Confirmed obligations outstanding at beginning of period | 47 | 57
Invoices confirmed during the period | 152 | 139
Confirmed invoices paid during the period | (187) | (149)
Confirmed obligations outstanding at end of period | $ 12 | $ 47

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