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Long-Term Debt - Schedule of Components of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Long-term debt $ 14,303 $ 13,193
Unamortized debt discount, net (27) (20)
Unamortized debt issuance costs (17) (15)
Less current portion of long-term debt (1,479) (637)
Total long-term debt $ 12,780 12,521
Long-term debt    
Debt Instrument [Line Items]    
Weighted Average Rate 4.23%  
Long-term debt | Other American Water subsidiaries | Mandatorily redeemable preferred stock    
Debt Instrument [Line Items]    
Weighted Average Rate 8.64%  
Long-term debt $ 3 3
Fixed rate | Long-term debt | Senior notes—fixed rate | American Water Capital Corp. (AWCC)    
Debt Instrument [Line Items]    
Weighted Average Rate 4.24%  
Long-term debt $ 12,961 11,786
Fixed rate | Long-term debt | Private activity bonds and government funded debt—fixed rate | Other American Water subsidiaries    
Debt Instrument [Line Items]    
Weighted Average Rate 2.41%  
Long-term debt $ 717 761
Fixed rate | Long-term debt | Private activity bonds and government funded debt—fixed rate | American Water Capital Corp. (AWCC)    
Debt Instrument [Line Items]    
Weighted Average Rate 3.07%  
Long-term debt $ 187 187
Fixed rate | Long-term debt | Mortgage bonds—fixed rate | Other American Water subsidiaries    
Debt Instrument [Line Items]    
Weighted Average Rate 7.37%  
Long-term debt $ 435 $ 456
Minimum | Long-term debt | Other American Water subsidiaries | Mandatorily redeemable preferred stock    
Debt Instrument [Line Items]    
Rate 8.47%  
Minimum | Fixed rate | Long-term debt | Senior notes—fixed rate | American Water Capital Corp. (AWCC)    
Debt Instrument [Line Items]    
Rate 2.30%  
Minimum | Fixed rate | Long-term debt | Private activity bonds and government funded debt—fixed rate | Other American Water subsidiaries    
Debt Instrument [Line Items]    
Rate 0.00%  
Minimum | Fixed rate | Long-term debt | Private activity bonds and government funded debt—fixed rate | American Water Capital Corp. (AWCC)    
Debt Instrument [Line Items]    
Rate 0.00%  
Minimum | Fixed rate | Long-term debt | Mortgage bonds—fixed rate | Other American Water subsidiaries    
Debt Instrument [Line Items]    
Rate 6.35%  
Maximum | Long-term debt | Other American Water subsidiaries | Mandatorily redeemable preferred stock    
Debt Instrument [Line Items]    
Rate 9.75%  
Maximum | Fixed rate | Long-term debt | Senior notes—fixed rate | American Water Capital Corp. (AWCC)    
Debt Instrument [Line Items]    
Rate 8.27%  
Maximum | Fixed rate | Long-term debt | Private activity bonds and government funded debt—fixed rate | Other American Water subsidiaries    
Debt Instrument [Line Items]    
Rate 5.00%  
Maximum | Fixed rate | Long-term debt | Private activity bonds and government funded debt—fixed rate | American Water Capital Corp. (AWCC)    
Debt Instrument [Line Items]    
Rate 3.88%  
Maximum | Fixed rate | Long-term debt | Mortgage bonds—fixed rate | Other American Water subsidiaries    
Debt Instrument [Line Items]    
Rate 9.19%