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Organization and Basis of Presentation (Confirmed Obligations) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Duke Energy (Parent)        
Contractual Obligations [Roll Forward]        
Confirmed obligations at beginning of period $ 28 $ 40 $ 50 $ 87
Invoices confirmed during the period 26 47 146 161
Confirmed invoices paid during the period (28) (18) (170) (179)
Confirmed obligations at end of period 26 69 26 69
Duke Energy Carolinas        
Contractual Obligations [Roll Forward]        
Confirmed obligations at beginning of period 0 5 0 6
Invoices confirmed during the period 0 2 0 22
Confirmed invoices paid during the period 0 (4) 0 (25)
Confirmed obligations at end of period 0 3 0 3
Progress Energy        
Contractual Obligations [Roll Forward]        
Confirmed obligations at beginning of period 0 14 3 19
Invoices confirmed during the period 1 11 2 53
Confirmed invoices paid during the period 0 (8) (4) (55)
Confirmed obligations at end of period 1 17 1 17
Duke Energy Progress        
Contractual Obligations [Roll Forward]        
Confirmed obligations at beginning of period 0 12 0 8
Invoices confirmed during the period 0 2 0 25
Confirmed invoices paid during the period 0 (3) 0 (22)
Confirmed obligations at end of period 0 11 0 11
Duke Energy Florida        
Contractual Obligations [Roll Forward]        
Confirmed obligations at beginning of period 0 2 3 11
Invoices confirmed during the period 1 9 2 28
Confirmed invoices paid during the period 0 (5) (4) (33)
Confirmed obligations at end of period 1 6 1 6
Duke Energy Ohio        
Contractual Obligations [Roll Forward]        
Confirmed obligations at beginning of period 0 2 0 5
Invoices confirmed during the period 0 4 0 7
Confirmed invoices paid during the period 0 0 0 (6)
Confirmed obligations at end of period 0 6 0 6
Duke Energy Indiana        
Contractual Obligations [Roll Forward]        
Confirmed obligations at beginning of period 0 0 0 0
Invoices confirmed during the period 0 0 0 0
Confirmed invoices paid during the period 0 0 0 0
Confirmed obligations at end of period 0 0 0 0
Piedmont        
Contractual Obligations [Roll Forward]        
Confirmed obligations at beginning of period 28 19 47 57
Invoices confirmed during the period 25 30 144 79
Confirmed invoices paid during the period (28) (6) (166) (93)
Confirmed obligations at end of period $ 25 $ 43 $ 25 $ 43