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Business Segments (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 08, 2021
USD ($)
Jan. 28, 2021
USD ($)
closing
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
segment
Segment Reporting Information [Line Items]        
Sale of noncontrolling interest [1]     $ 999 $ 999
Noncontrolling Interests        
Segment Reporting Information [Line Items]        
Sale of noncontrolling interest [1]     454 $ 454
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%      
Transaction costs $ 27      
Sale of noncontrolling interest $ 545      
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     $ 206 $ 206
Joint owner ownership percentage     50.00% 50.00%
[1] Relates to the sale of a noncontrolling interest in Duke Energy Indiana. See Note 2 for additional discussion.