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Employee Benefit Plans (Contributions to Defined Benefit Pension Plans) (Details) - Pension Plan - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 77 | $ 141 | $ 19
Duke Energy Carolinas |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 7 | 46 | 0
Progress Energy |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 57 | 45 | 0
Duke Energy Progress |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 4 | 25 | 0
Duke Energy Florida |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 53 | 20 | 0
Duke Energy Ohio |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 2 | 0 | 4
Duke Energy Indiana |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 2 | 8 | 0
Piedmont |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 1 | $ 0 | $ 11

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