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Employee Benefit Plans (Employee Savings Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 238 | $ 246 | $ 229
Duke Energy Carolinas |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 75 | 76 | 70
Progress Energy |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 62 | 65 | 60
Duke Energy Progress |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 40 | 43 | 39
Duke Energy Florida |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 22 | 22 | 21
Duke Energy Ohio |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 6 | 6 | 5
Duke Energy Indiana |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 13 | 12 | 12
Piedmont |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 13 | $ 13 | $ 11

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