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Mergers, Acquisitions and Divestitures (Details)
$ in Millions
 12 Months Ended
Oct. 27, 2025
USD ($)
shares
Oct. 26, 2025
Rate
May 28, 2025
USD ($)
shares
Dec. 09, 2021
USD ($)
Dec. 31, 2025
USD ($)
acquisition
customer
Dec. 31, 2024
USD ($)
acquisition
customer
Dec. 31, 2023
USD ($)
Feb. 02, 2024
USD ($)
Schedule of Business Combinations, Asset Acquisition And Divestitures By Acquisition [Line Items]                
Number of acquisitions | acquisition         18 13    
Consideration transferred         $ 83 $ 417    
Consideration funded         81 415    
Assets         107      
Liabilities         36      
Consideration funded         12      
Goodwill from acquisitions         $ 12 $ 1    
Number of assets acquired from business combination | acquisition         8 7    
Interest income         $ 90 $ 94 $ 73  
Disposal Group, Disposed of by Sale | Homeowner Services Group                
Schedule of Business Combinations, Asset Acquisition And Divestitures By Acquisition [Line Items]                
Consideration       $ 1,275        
Proceeds from divestiture of businesses       480        
Contingent consideration receivable       75       $ 75
Interest income         $ 80 77 50  
Disposal Group, Disposed of by Sale | Homeowner Services Group | Secured Seller Promissory Note                
Schedule of Business Combinations, Asset Acquisition And Divestitures By Acquisition [Line Items]                
Debt instrument, face amount       $ 720       $ 795
Interest rate       7.00%       10.00%
New Jersey American Water                
Schedule of Business Combinations, Asset Acquisition And Divestitures By Acquisition [Line Items]                
Assets           426    
Liabilities           $ 10    
Operating Segments | Regulated Business                
Schedule of Business Combinations, Asset Acquisition And Divestitures By Acquisition [Line Items]                
Number of acquisitions | acquisition         6 1    
Goodwill from acquisitions         $ 12 $ 1    
Interest income         $ 5 $ 17 $ 28  
Water and Wastewater Services                
Schedule of Business Combinations, Asset Acquisition And Divestitures By Acquisition [Line Items]                
Number of customers in service | customer         20,900      
Number of customers | customer           69,500    
Essential Utilities, Inc.                
Schedule of Business Combinations, Asset Acquisition And Divestitures By Acquisition [Line Items]                
Merger transaction, share exchange ratio | Rate   30.50%            
Merger related costs         $ 13      
Audubon Water Company                
Schedule of Business Combinations, Asset Acquisition And Divestitures By Acquisition [Line Items]                
Total consideration for business combination     $ 7          
Number of shares issued in business combination (in shares) | shares     48,381          
Appalachian Utilities, Inc.                
Schedule of Business Combinations, Asset Acquisition And Divestitures By Acquisition [Line Items]                
Total consideration for business combination $ 4              
Number of shares issued in business combination (in shares) | shares 25,159