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Employee Benefit Plans (Information For Plans with Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - Pension Plan [Member] - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Qualified Plan [Member] |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | $ 679 | $ 1,386
Accumulated benefit obligation | 651 | 1,326
Fair value of plan assets | 610 | 1,260
Nonqualified Plan [Member] |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 304 | 331
Accumulated benefit obligation | 304 | 331
Duke Energy Carolinas [Member] | Nonqualified Plan [Member] |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 14 | 14
Accumulated benefit obligation | 14 | 14
Progress Energy [Member] | Qualified Plan [Member] |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 679 | 718
Accumulated benefit obligation | 651 | 683
Fair value of plan assets | 610 | 650
Progress Energy [Member] | Nonqualified Plan [Member] |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 106 | 116
Accumulated benefit obligation | 106 | 116
Duke Energy Progress [Member] | Nonqualified Plan [Member] |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 31 | 35
Accumulated benefit obligation | 31 | 35
Duke Energy Florida [Member] | Qualified Plan [Member] |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 679 | 718
Accumulated benefit obligation | 651 | 683
Fair value of plan assets | 610 | 650
Duke Energy Florida [Member] | Nonqualified Plan [Member] |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 43 | 47
Accumulated benefit obligation | 43 | 47
Duke Energy Ohio [Member] | Qualified Plan [Member] |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 123 | 337
Accumulated benefit obligation | 115 | 326
Fair value of plan assets | 69 | 308
Duke Energy Ohio [Member] | Nonqualified Plan [Member] |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 3 | 4
Accumulated benefit obligation | 3 | 4
Duke Energy Indiana [Member] | Qualified Plan [Member] |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 203 |
Accumulated benefit obligation | 199 |
Fair value of plan assets | 159 |
Duke Energy Indiana [Member] | Nonqualified Plan [Member] |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 3 | 3
Accumulated benefit obligation | 3 | 3
Piedmont Natural Gas [Member] | Nonqualified Plan [Member] |  |
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract] |  |
Projected benefit obligation | 3 | 4
Accumulated benefit obligation | $ 3 | $ 4

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