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Employee Benefit Plans (Contributions to Defined Benefit Pension Plans) (Details) - Pension Plan - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | $ 100 | $ 58
Duke Energy Carolinas |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | 26 | 15
Progress Energy |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | 22 | 13
Duke Energy Progress |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | 13 | 8
Duke Energy Florida |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | 9 | 5
Duke Energy Ohio |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | 5 | 3
Duke Energy Indiana |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | 8 | 5
Piedmont |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | $ 3 | $ 2

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