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Employee Benefit Plans (Information For Plans with Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - Pension Plan - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation |  | $ 3,323
Accumulated benefit obligation |  | 3,288
Fair value of plan assets |  | 3,073
Duke Energy Ohio |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | $ 105 | 103
Accumulated benefit obligation | 100 | 99
Fair value of plan assets | 31 | 31
Duke Energy Indiana |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 208 | 198
Accumulated benefit obligation | 203 | 193
Fair value of plan assets | $ 121 | $ 110

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