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Revenue
 3 Months Ended
Mar. 31, 2023
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Disaggregation of Revenue
The following table illustrates the sources of revenue:
Three Months Ended
March 31,
(in millions)20232022
Revenue from contracts with customers$1,383 $1,222 
Lease Revenue65 50 
Total$1,448 $1,272 
The following table reflects revenue from contracts with customers by application.
Three Months Ended
March 31,
(in millions)20232022
Water Infrastructure
     Transport$436 $393 
     Treatment88 90 
Applied Water
     Commercial Building Services183 161 
Residential Building Services70 73 
     Industrial Water200 191 
Measurement & Control Solutions
     Water334 265 
     Energy72 49 
Total$1,383 $1,222 

The following table reflects revenue from contracts with customers by geographical region.
Three Months Ended
March 31,
(in millions)20232022
Water Infrastructure
     United States$176 $147 
Western Europe190 186 
Emerging Markets (a)105 101 
Other53 49 
Applied Water
     United States244 221 
Western Europe104 94 
Emerging Markets (a)73 80 
Other32 30 
Measurement & Control Solutions
     United States257 181 
Western Europe77 69 
Emerging Markets (a)48 44 
Other24 20 
Total$1,383 $1,222 

(a)Emerging Markets includes results from the following regions: Eastern Europe, the Middle East and Africa, Latin America and Asia Pacific (excluding Japan, Australia and New Zealand, which are presented in "Other")
Contract Balances
We receive payments from customers based on a billing schedule as established in our contracts. Contract assets relate to costs incurred to perform in advance of scheduled billings. Contract liabilities relate to payments received in advance of performance under the contracts. Changes in contract assets and liabilities are due to our performance under the contract. 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 January 1, 2023$151 $183 
  Additions, net48 58 
  Revenue recognized from opening balance— (50)
  Billings transferred to accounts receivable (48)— 
  Foreign currency and other— — 
Balance at March 31, 2023$151 $191 
Balance at January 1, 2022$125 $164 
  Additions, net34 62 
  Revenue recognized from opening balance— (50)
  Billings transferred to accounts receivable(39)— 
  Foreign currency and other(2)(1)
Balance at March 31, 2022$118 $175 
(a)Excludes receivable balances, which are disclosed on the Condensed Consolidated Balance Sheets

Performance obligations
Delivery schedules vary from customer to customer based upon their requirements. Typically, large projects require longer lead production cycles and delays can occur from time to time. As of March 31, 2023, the aggregate amount of the transaction price allocated to performance obligations that are unsatisfied or partially unsatisfied for contracts with performance obligations, amount to $447 million. We expect to recognize the majority of revenue upon the completion of satisfying these performance obligations in the following 60 months. The Company elects to apply the practical expedient to exclude from this disclosure revenue related to performance obligations that are part of a contract whose original expected duration is less than one year.