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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table illustrates the sources of revenue:
| Year Ended December 31,
(in millions) | 2021 |  | 2020 |  | 2019
Revenue from contracts with customers | $ | 4,998 |  |  | $ | 4,681 |  |  | $ | 5,002 |
Lease Revenue | 197 |  |  | 195 |  |  | 247 |
Total | $ | 5,195 |  |  | $ | 4,876 |  |  | $ | 5,249 |
The following table reflects revenue from contracts with customers by application. The table below also reflects updates to the aggregation of applications to simplify and focus presentation.
| Year Ended December 31, |  |
(in millions) | 2021 |  | 2020 |  | 2019 |  |
Water Infrastructure |  |  |  |  |  |  |
Transport | $ | 1,619 |  |  | $ | 1,484 |  |  | $ | 1,533 |  |  |
Treatment | 431 |  |  | 400 |  |  | 397 |  |  |
Applied Water* |  |  |  |  |  |  |
Commercial Building Services | 609 |  |  | 558 |  |  | 600 |  |  |
Residential Building Services | 268 |  |  | 238 |  |  | 247 |  |  |
Industrial Water | 736 |  |  | 638 |  |  | 694 |  |  |
Measurement and Control Solutions |  |  |  |  |  |  |
Water | 1,055 |  |  | 1,039 |  |  | 1,134 |  |  |
Energy | 280 |  |  | 324 |  |  | 397 |  |  |
Total | $ | 4,998 |  |  | $ | 4,681 |  |  | $ | 5,002 |  |  |
*Items in the prior year footnote disclosures for Applied Water and Measurement and Control Solutions were reclassified to conform to the current classification. The following table reflects revenue from contracts with customers by geographical region. The presentation of geographic regions below has been updated to better align to how management currently focuses on revenue and growth platforms by geographic region. For consistency, the prior year balances have been adjusted to conform with the current year presentation. There has been no change to the Company's reportable segments.
| Year Ended December 31,
(in millions) | 2021 |  | 2020 |  | 2019
Water Infrastructure |  |  |  |  |
United States | $ | 556 |  |  | $ | 558 |  |  | $ | 593 |
Western Europe | 753 |  |  | 675 |  |  | 658 |
Emerging Markets (a) | 537 |  |  | 468 |  |  | 491 |
Other | 204 |  |  | 183 |  |  | 187 |
Applied Water |  |  |  |  |
United States | 804 |  |  | 754 |  |  | 816 |
Western Europe | 370 |  |  | 316 |  |  | 323 |
Emerging Markets (a) | 324 |  |  | 260 |  |  | 300 |
Other | 115 |  |  | 104 |  |  | 103 |
Measurement and Control Solutions |  |  |  |  |
United States | 796 |  |  | 856 |  |  | 972 |
Western Europe | 256 |  |  | 234 |  |  | 222 |
Emerging Markets (a) | 189 |  |  | 177 |  |  | 235 |
Other | 94 |  |  | 96 |  |  | 102 |
Total | $ | 4,998 |  |  | $ | 4,681 |  |  | $ | 5,002 |
Contract with Customer, Asset and Liability | The table below provides contract assets, contract liabilities, and significant changes in contract assets and liabilities:
(in millions) | Contract Assets (a) | Contract Liabilities |  |  |  |
Balance at 1/1/2020 | $ | 106 |  | $ | 135 |  |  |  |  |
Additions, net | 118 |  | 120 |  |  |  |  |
Revenue recognized from opening balance | — |  | (93) |  |  |  |  |
Billings transferred to accounts receivable | (110) |  | — |  |  |  |  |
Other | 3 |  | 4 |  |  |  |  |
Balance at 1/1/2021 | $ | 117 |  | $ | 166 |  |  |  |  |
Additions, net | 112 |  | 117 |  |  |  |  |
Revenue recognized from opening balance | — |  | (117) |  |  |  |  |
Billings transferred to accounts receivable | (103) |  | — |  |  |  |  |
Other | (1) |  | (2) |  |  |  |  |
Balance at 12/31/2021 | $ | 125 |  | $ | 164 |  |  |  |  |
(a)Excludes receivable balances which are disclosed on the balance sheet

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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