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Fair Value Measurements (Other Fair Value Disclosures) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | $ 80,689 | $ 75,252
Fair Value | 73,440 | 69,790
Unamortized debt discount and premium, net | 1,000 |
Duke Energy Carolinas |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 17,490 | 16,012
Fair Value | 15,975 | 15,077
Progress Energy |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 24,496 | 23,759
Fair Value | 22,548 | 22,553
Duke Energy Progress |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 12,504 | 11,714
Fair Value | 11,009 | 10,595
Duke Energy Florida |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 10,348 | 10,401
Fair Value | 9,752 | 10,123
Duke Energy Ohio |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 4,165 | 3,518
Fair Value | 3,871 | 3,310
Duke Energy Indiana |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 4,798 | 4,502
Fair Value | 4,329 | 4,230
Piedmont |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 4,003 | 3,668
Fair Value | $ 3,584 | $ 3,336

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