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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 2,177 $ 1,973 $ 6,406 $ 5,920
Lease Revenue 91 131 232 386
Total 2,268 2,104 6,638 6,306
Water Infrastructure | United States        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 256 209 704 638
Water Infrastructure | Western Europe        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 223 218 673 654
Water Infrastructure | Emerging Markets        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 118 136 353 372
Water Infrastructure | Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 59 59 157 163
Water Infrastructure | Transport        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 377 349 1,107 1,057
Water Infrastructure | Treatment        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 279 273 780 770
Applied Water | United States        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 250 237 755 708
Applied Water | Western Europe        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 102 96 307 297
Applied Water | Emerging Markets        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 68 81 210 238
Applied Water | Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 36 33 102 96
Applied Water | Building Solutions        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 260 248 777 743
Applied Water | Industrial Water        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 196 199 597 596
Measurement and Control Solutions | United States        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 340 322 1,022 956
Measurement and Control Solutions | Western Europe        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 93 61 259 220
Measurement and Control Solutions | Emerging Markets        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 46 47 143 138
Measurement and Control Solutions | Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 43 28 128 88
Measurement and Control Solutions | Smart Metering and Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 428 372 1,281 1,142
Measurement and Control Solutions | Analytics        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 94 86 271 260
Water Solutions and Services | United States        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 403 342 1,185 1,035
Water Solutions and Services | Western Europe        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 23 24 73 71
Water Solutions and Services | Emerging Markets        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 69 42 175 125
Water Solutions and Services | Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 48 38 160 121
Water Solutions and Services | Capital and Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 288 198 841 621
Water Solutions and Services | Services        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 255 $ 248 $ 752 $ 731