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Revenue Recognition - Disaggregated Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers $ 5,121 $ 4,653 $ 4,217
Other revenues not from contracts with customers 19 31 17
Operating revenues 5,140 4,684 4,234
Other      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 417 388 315
Other revenues not from contracts with customers 0 0 (1)
Operating revenues 417 388 314
Regulated Businesses | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 4,704 4,265 3,902
Other revenues not from contracts with customers 19 31 18
Alternative revenue programs 12 10 10
Lease contract revenue 7 8 8
Operating revenues 4,723 4,296 3,920
Regulated Businesses | Water services: | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 4,233 3,862 3,540
Other revenues not from contracts with customers 0 11 0
Operating revenues 4,233 3,873 3,540
Regulated Businesses | Wastewater services: | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 422 361 327
Other revenues not from contracts with customers 0 2 0
Operating revenues 422 363 327
Regulated Businesses | Miscellaneous utility charges | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 49 42 35
Other revenues not from contracts with customers 0 0 0
Operating revenues 49 42 35
Regulated Businesses | Residential | Water services: | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 2,557 2,344 2,143
Other revenues not from contracts with customers 0 5 0
Operating revenues 2,557 2,349 2,143
Regulated Businesses | Residential | Wastewater services: | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 287 243 228
Other revenues not from contracts with customers 0 2 0
Operating revenues 287 245 228
Regulated Businesses | Commercial | Water services: | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 981 881 798
Other revenues not from contracts with customers 0 4 0
Operating revenues 981 885 798
Regulated Businesses | Commercial | Wastewater services: | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 86 70 62
Other revenues not from contracts with customers 0 0 0
Operating revenues 86 70 62
Regulated Businesses | Fire service | Water services: | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 189 164 158
Other revenues not from contracts with customers 0 0 0
Operating revenues 189 164 158
Regulated Businesses | Industrial | Water services: | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 195 182 167
Other revenues not from contracts with customers 0 2 0
Operating revenues 195 184 167
Regulated Businesses | Industrial | Wastewater services: | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 10 12 8
Other revenues not from contracts with customers 0 0 0
Operating revenues 10 12 8
Regulated Businesses | Public and other | Water services: | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 311 291 274
Other revenues not from contracts with customers 0 0 0
Operating revenues 311 291 274
Regulated Businesses | Public and other | Wastewater services: | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenues from Contracts with Customers 39 36 29
Other revenues not from contracts with customers 0 0 0
Operating revenues $ 39 $ 36 $ 29