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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, 2021 | Dec. 31, 2020
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Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation |  | $ 4,914
Accumulated benefit obligation |  | 4,856
Fair value of plan assets |  | 4,837
Progress Energy |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation |  | 828
Accumulated benefit obligation |  | 796
Fair value of plan assets |  | 783
Duke Energy Florida |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation |  | 828
Accumulated benefit obligation |  | 796
Fair value of plan assets |  | 783
Duke Energy Ohio |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | $ 153 | 184
Accumulated benefit obligation | 143 | 176
Fair value of plan assets | 67 | 96
Duke Energy Indiana |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 284 | 293
Accumulated benefit obligation | 275 | 285
Fair value of plan assets | $ 173 | $ 183

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