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Revenue
 6 Months Ended
Jun. 30, 2022
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Disaggregation of Revenue
The following table illustrates the sources of revenue:
Three Months EndedSix Months Ended
June 30,June 30,
(in millions)2022202120222021
Revenue from contracts with customers$1,312 $1,302 $2,534 $2,513 
Lease Revenue52 49 102 94 
Total$1,364 $1,351 $2,636 $2,607 

The following table reflects revenue from contracts with customers by application.
Three Months EndedSix Months Ended
June 30,June 30,
(in millions)2022202120222021
Water Infrastructure
     Transport$432 $414 $825 $784 
     Treatment104 106 194 200 
Applied Water*
     Commercial Building Services147 155 308 303 
Residential Building Services79 71 153 135 
     Industrial Water204 188 394 369 
Measurement & Control Solutions
     Water279 288 544 571 
     Energy67 80 116 151 
Total$1,312 $1,302 $2,534 $2,513 
*Items in the prior year footnote disclosures for Applied Water were reclassified to conform to the current classification.
The following table reflects revenue from contracts with customers by geographical region.
Three Months EndedSix Months Ended
June 30,June 30,
(in millions)2022202120222021
Water Infrastructure
     United States$165 $142 $312 $265 
Western Europe190 190 376 363 
Emerging Markets (a)120 133 221 255 
Other61 55 110 101 
Applied Water
     United States219 202 440 396 
Western Europe101 99 195 191 
Emerging Markets (a)79 81 159 159 
Other31 32 61 61 
Measurement & Control Solutions
     United States212 224 393 437 
Western Europe59 69 128 143 
Emerging Markets (a)50 49 94 95 
Other25 26 45 47 
Total$1,312 $1,302 $2,534 $2,513 

(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, 2021$117 $166 
  Additions, net78 99 
  Revenue recognized from opening balance— (93)
  Billings transferred to accounts receivable (74)— 
  Other— (1)
Balance at June 30, 2021$121 $171 
Balance at January 1, 2022$125 $164 
  Additions, net63 97 
  Revenue recognized from opening balance— (75)
  Billings transferred to accounts receivable(61)— 
  Other(4)(3)
Balance at June 30, 2022$123 $183 
(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 June 30, 2022, the aggregate amount of the transaction price allocated to performance obligations that are unsatisfied or partially unsatisfied for contracts with performance obligations, amount to $498 million. We expect to recognize the majority of revenue upon the completion of satisfying these performance obligations in the following three years. 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.