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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] |
Rent expense | $ 268
Duke Energy Carolinas [Member] |
Operating Leased Assets [Line Items] |
Rent expense | 49
Progress Energy [Member] |
Operating Leased Assets [Line Items] |
Rent expense | 143
Duke Energy Progress [Member] |
Operating Leased Assets [Line Items] |
Rent expense | 75
Duke Energy Florida [Member] |
Operating Leased Assets [Line Items] |
Rent expense | 68
Duke Energy Ohio [Member] |
Operating Leased Assets [Line Items] |
Rent expense | 13
Duke Energy Indiana [Member] |
Operating Leased Assets [Line Items] |
Rent expense | 21
Piedmont Natural Gas [Member] |
Operating Leased Assets [Line Items] |
Rent expense | $ 11

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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