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Fair Value Measurements (Other Fair Value Disclosures) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term Debt | $ 63,835 | $ 59,863
Long-term debt, fair value | 69,683 | 69,292
Unamortized debt discount and premium, net | 1,250 | 1,300
Duke Energy Carolinas |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term Debt | 13,275 | 12,218
Long-term debt, fair value | 15,101 | 14,917
Progress Energy |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term Debt | 20,823 | 19,264
Long-term debt, fair value | 23,751 | 23,470
Duke Energy Progress |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term Debt | 10,249 | 9,258
Long-term debt, fair value | 11,252 | 10,862
Duke Energy Florida |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term Debt | 8,482 | 7,915
Long-term debt, fair value | 9,772 | 9,756
Duke Energy Ohio |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term Debt | 3,193 | 3,089
Long-term debt, fair value | 3,570 | 3,650
Duke Energy Indiana |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term Debt | 4,323 | 4,091
Long-term debt, fair value | 5,067 | 5,204
Piedmont |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term Debt | 2,968 | 2,780
Long-term debt, fair value | $ 3,278 | $ 3,306

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