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Fair Value Measurements (Other Fair Value Disclosures) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | $ 75,252 | $ 69,751
Fair Value | 69,790 | 61,986
Unamortized debt discount and premium, net | 1,000 | 1,200
Duke Energy Carolinas |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 16,012 | 14,266
Fair Value | 15,077 | 12,943
Progress Energy |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 23,759 | 22,439
Fair Value | 22,553 | 20,467
Duke Energy Progress |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 11,714 | 11,087
Fair Value | 10,595 | 9,689
Duke Energy Florida |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 10,401 | 9,709
Fair Value | 10,123 | 8,991
Duke Energy Ohio |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 3,518 | 3,245
Fair Value | 3,310 | 2,927
Duke Energy Indiana |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 4,502 | 4,307
Fair Value | 4,230 | 3,913
Piedmont |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 3,668 | 3,363
Fair Value | $ 3,336 | $ 2,940

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