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Fair Value Measurements (Other Fair Value Disclosures) (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | $ 87,212 | $ 80,689
Fair Value | 79,863 | 73,440
Unamortized debt discount and premium, net | 921 | 1,000
Duke Energy Carolinas |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 18,777 | 17,490
Fair Value | 16,764 | 15,975
Progress Energy |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 26,848 | 24,496
Fair Value | 24,957 | 22,548
Duke Energy Progress |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 13,896 | 12,504
Fair Value | 12,445 | 11,009
Duke Energy Florida |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 11,307 | 10,348
Fair Value | 10,720 | 9,752
Duke Energy Ohio |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 4,420 | 4,165
Fair Value | 4,151 | 3,871
Duke Energy Indiana |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 5,093 | 4,798
Fair Value | 4,646 | 4,329
Piedmont |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Book Value | 4,251 | 4,003
Fair Value | $ 3,960 | $ 3,584

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