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Severance (Expenses) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance expense | $ 187 | $ 16 | $ 187 | $ 15
Duke Energy Carolinas |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance expense | 102 | 8 | 102 | 2
Progress Energy |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance expense | 69 | 6 | 69 | 2
Duke Energy Progress |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance expense | 52 | 3 | 52 | 1
Duke Energy Florida |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance expense | 17 | 3 | 17 | 1
Duke Energy Ohio |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance expense | 6 |  | 6 |
Duke Energy Indiana |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance expense | 7 | 1 | 7 | 1
Piedmont |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance expense | $ 2 | $ 1 | $ 2 | $ 9

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