v3.26.1
Capitalization (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
May 01, 2026
Mar. 09, 2026
Mar. 19, 2025
Aug. 13, 2024
Jun. 30, 2026
Jun. 30, 2026
Jun. 16, 2026
At Market Sales Agreements 2024 [Member]              
Debt Instrument [Line Items]              
Common stock shares future issuance and sale at aggregate offering price       $ 1,000,000,000      
Sale of stock, shares         264,356 308,656  
Common stock issued         $ 10,700,000 $ 12,500,000  
Stock remaining available for sale, amount         648,000,000 648,000,000  
Unsecured Credit Facility [Member]              
Debt Instrument [Line Items]              
Borrowing capacity             $ 1,000,000,000
Amount borrowed         0 0  
Commercial Paper [Member]              
Debt Instrument [Line Items]              
Available for borrowing         384,723,000 384,723,000  
Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Available for borrowing         600,974,000 600,974,000  
Letter of Credit [Member]              
Debt Instrument [Line Items]              
Available for borrowing         14,303,000 14,303,000  
Commercial Paper Program [Member]              
Debt Instrument [Line Items]              
Net of unamortized discount on issuance         $ 455,000 $ 455,000  
Weighted average interest rate         4.07% 4.07%  
Weighted average remaining term           11 days  
Face Amount         $ 384,723,000 $ 384,723,000  
Line of Credit [Member]              
Debt Instrument [Line Items]              
Borrowing capacity         400,000,000 400,000,000  
Available for borrowing         359,000,000 359,000,000  
Unsecured Debt [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Borrowing capacity         1,000,000,000 1,000,000,000  
Senior Notes [Member]              
Debt Instrument [Line Items]              
Proceeds from issuance of senior notes   $ 500,000,000          
Less expense on issuance of notes   $ 5,140,000          
Maturity   Mar. 15, 2036          
Debt instrument, interest rate   5.125%          
Loans [Member]              
Debt Instrument [Line Items]              
Face Amount         $ 27,100,000 $ 27,100,000  
Aqua Pennsylvania, Inc [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Borrowing capacity $ 100,000,000            
Peoples Natural Gas Companies [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Borrowing capacity $ 300,000            
Minimum [Member] | Loans [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate         0.00% 0.00%  
Maturity Year           2030  
Maximum [Member] | Commercial Paper [Member]              
Debt Instrument [Line Items]              
Borrowing capacity     $ 1,000,000,000        
Term of debt     364 days        
Maximum [Member] | Loans [Member]              
Debt Instrument [Line Items]              
Debt instrument, interest rate         1.743% 1.743%  
Maturity Year           2049  
Maximum [Member] | Peoples Natural Gas Companies [Member]              
Debt Instrument [Line Items]              
Term of debt 364 days