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Employee Benefit Plans (Contributions to Defined Benefit Pension Plans) (Details) - Pension Plan [Member] - USD ($) $ in Millions | 2 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  | $ 141 | $ 19 | $ 155 |
Duke Energy Carolinas [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  | 46 |  | 43 |
Progress Energy [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  | 45 |  | 43 |
Duke Energy Progress [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  | 25 |  | 24 |
Duke Energy Florida [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  | 20 |  | 20 |
Duke Energy Ohio [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  |  | 4 | 5 |
Duke Energy Indiana [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  | $ 8 |  | 9 |
Piedmont Natural Gas [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions | $ 10 |  | $ 11 |  | $ 10

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