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Leases (Lease Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Lessee, Lease, Description [Line Items] |  |
Operating lease expense | $ 283 | $ 275
Short-term lease expense | 6 | 7
Variable lease expense | 39 | 33
Finance lease expense |  |
Amortization of leased assets | 64 | 113
Interest on lease liabilities | 40 | 41
Total finance lease expense | 104 | 154
Total lease expense | 432 | 469
Duke Energy Carolinas |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease expense | 60 | 66
Variable lease expense | 2 | 2
Finance lease expense |  |
Amortization of leased assets | 12 | 7
Interest on lease liabilities | 30 | 31
Total finance lease expense | 42 | 38
Total lease expense | 104 | 106
Progress Energy |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease expense | 181 | 173
Short-term lease expense | 3 | 3
Variable lease expense | 35 | 29
Finance lease expense |  |
Amortization of leased assets | 53 | 46
Interest on lease liabilities | 43 | 44
Total finance lease expense | 96 | 90
Total lease expense | 315 | 295
Duke Energy Progress |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease expense | 91 | 82
Short-term lease expense |  | 1
Variable lease expense | 26 | 19
Finance lease expense |  |
Amortization of leased assets | 43 | 38
Interest on lease liabilities | 39 | 41
Total finance lease expense | 82 | 79
Total lease expense | 199 | 181
Duke Energy Florida |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease expense | 90 | 91
Short-term lease expense | 3 | 2
Variable lease expense | 9 | 10
Finance lease expense |  |
Amortization of leased assets | 10 | 8
Interest on lease liabilities | 4 | 3
Total finance lease expense | 14 | 11
Total lease expense | 116 | 114
Duke Energy Ohio |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease expense | 14 | 12
Finance lease expense |  |
Total lease expense | 14 | 12
Duke Energy Indiana |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease expense | 27 | 23
Short-term lease expense | 1 | 1
Variable lease expense | 1 | 1
Finance lease expense |  |
Amortization of leased assets | 2 |
Interest on lease liabilities | 1 | 1
Total finance lease expense | 3 | 1
Total lease expense | 32 | 26
Piedmont |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease expense | 1 | 2
Variable lease expense | 1 | 1
Finance lease expense |  |
Total lease expense | $ 2 | $ 3

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- Definition Amount of interest expense on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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