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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