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Dispositions (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended 9 Months Ended 35 Months Ended
Mar. 31, 2026
Aug. 04, 2025
Jun. 30, 2028
Dec. 31, 2027
Jun. 30, 2027
Dec. 31, 2026
Jun. 30, 2026
Sep. 30, 2024
Jun. 30, 2028
Sep. 30, 2025
Dec. 31, 2024
Oct. 25, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Aggregate investment from noncontrolling owner               $ 47        
Current liabilities associated with assets held for sale                   $ 57 $ 132  
Florida Progress LLC                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Investment Agreement, termination fee   $ 240                    
Florida Progress LLC | Forecast                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Noncontrolling ownership percentage     19.70%       9.20%   19.70%      
Aggregate investment from noncontrolling owner     $ 1,000 $ 1,500 $ 500 $ 200 $ 2,800   $ 6,000      
Discontinued Operations, Disposed of by Sale | Piedmont Tennessee Disposal Group | Forecast                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Consideration to be received $ 2,480                      
Purchase Agreement termination fee, percentage 6.50%                      
Discontinued Operations, Disposed of by Sale | Commercial Renewables                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Consideration to be received                       $ 1,100
Consideration period                       18 months
Discontinued Operations, Disposed of by Sale | Commercial Renewables | Noncurrent assets                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Consideration to be received                     551  
Discontinued Operations, Held-for-sale                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Current liabilities associated with assets held for sale                   57 132  
Discontinued Operations, Held-for-sale | Piedmont Tennessee Disposal Group                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Current liabilities associated with assets held for sale                   39 52  
Discontinued Operations, Held-for-sale | Commercial Renewables                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Current liabilities associated with assets held for sale                   $ 18 80  
Noncontrolling interest balance                     $ 18