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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, 2020 | Dec. 31, 2019
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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 | 184 | $ 155
Accumulated benefit obligation | 176 | 146
Fair value of plan assets | 96 | 79
Duke Energy Indiana |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 293 | 260
Accumulated benefit obligation | 285 | 252
Fair value of plan assets | $ 183 | $ 177

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