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Business Segments (Narrative) (Details)
$ in Millions
3 Months Ended
Sep. 08, 2021
USD ($)
Jan. 28, 2021
USD ($)
closing
Mar. 31, 2022
USD ($)
segment
Jan. 01, 2023
Duke Energy Indiana | Noncontrolling Interests        
Segment Reporting Information [Line Items]        
Percentage sold   19.90%    
Number of closings | closing   2    
Value of sale of parent interest $ 1,025 $ 2,000    
Ownership interest sold 11.05%      
Proceed of purchase price for exchange in interest 50.00%      
Duke Energy Indiana | Noncontrolling Interests | Forecast        
Segment Reporting Information [Line Items]        
Percentage sold       19.90%
Proceed of purchase price for exchange in interest       50.00%
Duke Energy Ohio        
Segment Reporting Information [Line Items]        
Number of reportable segments | segment     2  
Wind and solar | Nonregulated        
Segment Reporting Information [Line Items]        
Renewable merchant plants     $ 200  
Joint owner ownership percentage     51.00%