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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, 2019 | Dec. 31, 2018
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Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation |  | $ 679
Accumulated benefit obligation |  | 651
Fair value of plan assets |  | 610
Progress Energy |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation |  | 679
Accumulated benefit obligation |  | 651
Fair value of plan assets |  | 610
Duke Energy Florida |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation |  | 679
Accumulated benefit obligation |  | 651
Fair value of plan assets |  | 610
Duke Energy Ohio |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | $ 155 | 123
Accumulated benefit obligation | 146 | 115
Fair value of plan assets | 79 | 69
Duke Energy Indiana |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 260 | 203
Accumulated benefit obligation | 252 | 199
Fair value of plan assets | $ 177 | $ 159

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