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Leases (Lease Costs) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019
Lessee, Lease, Description [Line Items] |  |
Operating cash flows from operating leases |  | $ 136
Operating lease expense | $ 73 | 145
Short-term lease expense | 6 | 13
Variable lease expense | 10 | 21
Finance lease expense |  |
Amortization of leased assets | 29 | 56
Interest on lease liabilities | 20 | 37
Total finance lease expense | 49 | 93
Total lease expense | 138 | 272
Operating cash flows from finance leases |  | 37
Financing cash flows from finance leases |  | 56
Finance |  | 175
Operating |  | 78
Duke Energy Carolinas [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Operating cash flows from operating leases |  | 15
Operating lease expense | 11 | 23
Short-term lease expense | 2 | 4
Variable lease expense | 4 | 12
Finance lease expense |  |
Amortization of leased assets | 1 | 2
Interest on lease liabilities | 3 | 7
Total finance lease expense | 4 | 9
Total lease expense | 21 | 48
Operating cash flows from finance leases |  | 7
Financing cash flows from finance leases |  | 2
Operating |  | 2
Progress Energy [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Operating cash flows from operating leases |  | 60
Operating lease expense | 40 | 82
Short-term lease expense | 4 | 7
Variable lease expense | 5 | 7
Finance lease expense |  |
Amortization of leased assets | 5 | 8
Interest on lease liabilities | 13 | 19
Total finance lease expense | 18 | 27
Total lease expense | 67 | 123
Operating cash flows from finance leases |  | 19
Financing cash flows from finance leases |  | 8
Finance |  | 175
Operating |  | 30
Duke Energy Progress [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Operating cash flows from operating leases |  | 23
Operating lease expense | 17 | 36
Short-term lease expense | 2 | 3
Variable lease expense | 2 | 3
Finance lease expense |  |
Amortization of leased assets | 1 | 2
Interest on lease liabilities | 10 | 14
Total finance lease expense | 11 | 16
Total lease expense | 32 | 58
Operating cash flows from finance leases |  | 14
Financing cash flows from finance leases |  | 2
Finance |  | 175
Operating |  | 30
Duke Energy Florida [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Operating cash flows from operating leases |  | 37
Operating lease expense | 23 | 46
Short-term lease expense | 2 | 4
Variable lease expense | 3 | 4
Finance lease expense |  |
Amortization of leased assets | 4 | 6
Interest on lease liabilities | 3 | 5
Total finance lease expense | 7 | 11
Total lease expense | 35 | 65
Operating cash flows from finance leases |  | 5
Financing cash flows from finance leases |  | 6
Duke Energy Ohio [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Operating cash flows from operating leases |  | 1
Operating lease expense | 3 | 6
Short-term lease expense | 1 | 1
Finance lease expense |  |
Amortization of leased assets | 1 | 1
Total finance lease expense | 1 | 1
Total lease expense | 5 | 8
Financing cash flows from finance leases |  | 1
Duke Energy Indiana [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Operating cash flows from operating leases |  | 3
Operating lease expense | 5 | 10
Short-term lease expense |  | 1
Finance lease expense |  |
Interest on lease liabilities | 1 | 1
Total finance lease expense | 1 | 1
Total lease expense | 6 | 12
Operating cash flows from finance leases |  | 1
Piedmont Natural Gas [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Operating cash flows from operating leases |  | 5
Operating lease expense | 2 | 3
Finance lease expense |  |
Total lease expense | $ 2 | 3
Operating |  | $ 1

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