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Leases (Rent Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Operating Leased Assets [Line Items] |  |
Rental expense on operating leases | $ 268 | $ 241
Duke Energy Carolinas |  |
Operating Leased Assets [Line Items] |  |
Rental expense on operating leases | 49 | 44
Progress Energy |  |
Operating Leased Assets [Line Items] |  |
Rental expense on operating leases | 143 | 130
Duke Energy Progress |  |
Operating Leased Assets [Line Items] |  |
Rental expense on operating leases | 75 | 75
Duke Energy Florida |  |
Operating Leased Assets [Line Items] |  |
Rental expense on operating leases | 68 | 55
Duke Energy Ohio |  |
Operating Leased Assets [Line Items] |  |
Rental expense on operating leases | 13 | 15
Duke Energy Indiana |  |
Operating Leased Assets [Line Items] |  |
Rental expense on operating leases | 21 | 23
Piedmont |  |
Operating Leased Assets [Line Items] |  |
Rental expense on operating leases | $ 11 | $ 7

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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