v3.26.1
Fair Value Measurements (Other Fair Value Disclosure) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Book Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 87,872 $ 87,212
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 81,221 79,863
Piedmont Natural Gas and Progress Energy    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unamortized debt discount (premium), net 900 921
Duke Energy Carolinas | Book Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 19,788 18,777
Duke Energy Carolinas | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 17,947 16,764
Progress Energy | Book Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 27,057 26,848
Progress Energy | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 25,447 24,957
Duke Energy Progress | Book Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 13,860 13,896
Duke Energy Progress | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 12,528 12,445
Duke Energy Florida | Book Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 11,552 11,307
Duke Energy Florida | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 11,122 10,720
Duke Energy Ohio | Book Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 4,376 4,420
Duke Energy Ohio | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 4,136 4,151
Duke Energy Indiana | Book Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 5,590 5,093
Duke Energy Indiana | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 5,156 4,646
Piedmont | Book Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 3,801 4,251
Piedmont | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 3,464 $ 3,960