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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 1,302 | $ 1,114 | $ 2,513 | $ 2,188
Lease Revenue | 49 | 46 | 94 | 95
Total | 1,351 | 1,160 | 2,607 | 2,283
Water Infrastructure |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 569 | 501 | 1,078 | 939
Water Infrastructure | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 142 | 144 | 265 | 265
Water Infrastructure | Western Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 190 | 157 | 363 | 299
Water Infrastructure | Emerging Markets |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 133 | 109 | 255 | 195
Water Infrastructure | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 55 | 45 | 101 | 85
Water Infrastructure | Transport |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 414 | 350 | 784 | 668
Water Infrastructure | Treatment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 106 | 105 | 200 | 176
Applied Water |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 414 | 337 | 807 | 675
Applied Water | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 202 | 183 | 396 | 374
Applied Water | Western Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 99 | 70 | 191 | 144
Applied Water | Emerging Markets |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 81 | 61 | 159 | 111
Applied Water | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 32 | 23 | 61 | 46
Applied Water | Commercial Building Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 155 | 133 | 302 | 270
Applied Water | Residential Building Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 73 | 54 | 140 | 104
Applied Water | Industrial Water |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 186 | 150 | 365 | 301
Measurement & Control Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 368 | 322 | 722 | 669
Measurement & Control Solutions | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 224 | 212 | 437 | 433
Measurement & Control Solutions | Western Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 69 | 51 | 143 | 114
Measurement & Control Solutions | Emerging Markets |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 49 | 39 | 95 | 80
Measurement & Control Solutions | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 26 | 20 | 47 | 42
Measurement & Control Solutions | Water |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 288 | 240 | 571 | 505
Measurement & Control Solutions | Energy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 80 | $ 82 | $ 151 | $ 164

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