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Employee Benefit Plans (Employee Savings Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 257 | $ 238 | $ 246
Duke Energy Carolinas |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 81 | 75 | 76
Progress Energy |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 72 | 62 | 65
Duke Energy Progress |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 43 | 40 | 43
Duke Energy Florida |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 29 | 22 | 22
Duke Energy Ohio |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 6 | 6 | 6
Duke Energy Indiana |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 13 | 13 | 12
Piedmont |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 14 | $ 13 | $ 13

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