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Summary of Significant Accounting Policies (Noncontrolling Interest) (Details)
$ in Millions
12 Months Ended
Sep. 08, 2021
USD ($)
Jan. 28, 2021
USD ($)
closing
Dec. 31, 2021
USD ($)
[1]
Dec. 31, 2019
USD ($)
asset
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Sale of noncontrolling interest     $ 999 $ 407 [2]
Noncontrolling Interests        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Sale of noncontrolling interest     $ 454 863 [2]
Noncontrolling Interests | Renewables        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Value of sale of parent interest       415
Ownership interest change       466
Tax benefit from sale of interest       $ 8
Noncontrolling Interests | Wind and Solar Storage        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Percentage sold       49.00%
Number of assets sold | asset       37
Noncontrolling Interests | Operating Solar Assets        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Percentage sold       33.00%
Number of assets sold | asset       11
Noncontrolling Interests | Duke Energy Indiana        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Value of sale of parent interest $ 1,025      
Percentage sold   19.90%    
Number of closings | closing   2    
Ownership interest sold 11.05%      
Proceed of purchase price for exchange in interest 50.00% 50.00%    
Transaction costs $ 27      
Sale of noncontrolling interest $ 545      
Noncontrolling Interests | Duke Energy Indiana        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Value of sale of parent interest   $ 2,000    
Percentage sold   19.90%    
[1] Relates to the sale of a noncontrolling interest in Duke Energy Indiana. See Note 1 for additional discussion
[2] Relates to the sale of a noncontrolling interest in the Commercial Renewables segment. See Note 1 for additional discussion of the transaction.