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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Indiana) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 04, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2026
Dec. 31, 2025
Sep. 20, 2023
Jun. 15, 2022
Public Utilities, General Disclosures [Line Items]                  
Impairment of assets and other charges   $ (5) $ 88 $ 39 $ 96        
Operating Revenues   8,154 7,994 22,997 21,848        
Duke Energy Indiana                  
Public Utilities, General Disclosures [Line Items]                  
Operating Revenues   $ 836 $ 851 $ 2,342 $ 2,606        
Indiana Coal Ash Recovery | IURC | Duke Energy Indiana                  
Public Utilities, General Disclosures [Line Items]                  
Interest rate on refunds (as a percent)               4.71%  
TDSIG 2.0 | IURC | Duke Energy Indiana                  
Public Utilities, General Disclosures [Line Items]                  
Future investment in infrastructure                 $ 2,000
2024 Indiana Rate Case | IURC | Duke Energy Indiana                  
Public Utilities, General Disclosures [Line Items]                  
Future investment in infrastructure $ 1,600                
Requested rate increase (decrease), amount $ 492                
Requested rate increase, percentage, net of tax 16.20%                
Requested return on equity (as a percent) 10.50%                
Equity ratio (as a percent) 53.00%                
2024 Indiana Rate Case | IURC | Duke Energy Indiana | Forecast                  
Public Utilities, General Disclosures [Line Items]                  
Requested rate increase, percentage, net of tax           4.50% 11.70%