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Employee Benefit Plans (Information For Plans with Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - Pension Plan - Qualified Plan - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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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 | 103 | $ 153
Accumulated benefit obligation | 99 | 143
Fair value of plan assets | 31 | 67
Duke Energy Indiana |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 198 | 284
Accumulated benefit obligation | 193 | 275
Fair value of plan assets | $ 110 | $ 173

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