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

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