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Organization and Basis of Presentation (Confirmed Obligations) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Duke Energy (Parent)    
Contractual Obligations [Roll Forward]    
Confirmed obligations at beginning of period $ 13 $ 50
Invoices confirmed during the period 18 57
Confirmed invoices paid during the period (13) (31)
Confirmed obligations at end of period 18 76
Progress Energy    
Contractual Obligations [Roll Forward]    
Confirmed obligations at beginning of period 1 3
Invoices confirmed during the period 0 1
Confirmed invoices paid during the period (1) (2)
Confirmed obligations at end of period 0 2
Duke Energy Florida    
Contractual Obligations [Roll Forward]    
Confirmed obligations at beginning of period 1 3
Invoices confirmed during the period 0 1
Confirmed invoices paid during the period (1) (2)
Confirmed obligations at end of period 0 2
Piedmont    
Contractual Obligations [Roll Forward]    
Confirmed obligations at beginning of period 12 47
Invoices confirmed during the period 18 56
Confirmed invoices paid during the period (12) (29)
Confirmed obligations at end of period $ 18 $ 74