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Revenue
 12 Months Ended
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Disaggregation of Revenue
The following table illustrates the sources of revenue:
Year Ended December 31,
(in millions)202220212020
Revenue from contracts with customers$5,294 $4,998 $4,681 
Lease Revenue228 197 195 
Total$5,522 $5,195 $4,876 

The following table reflects revenue from contracts with customers by application:
Year Ended December 31,
(in millions)202220212020
Water Infrastructure
     Transport$1,715 $1,619 $1,484 
     Treatment421 431 400 
Applied Water
     Commercial Building Services659 609 558 
     Residential Building Services306 268 238 
     Industrial Water802 736 638 
Measurement and Control Solutions
     Water1,126 1,055 1,039 
     Energy265 280 324 
Total$5,294 $4,998 $4,681 
The following table reflects revenue from contracts with customers by geographical region:
Year Ended December 31,
(in millions)202220212020
Water Infrastructure
    United States$664 $556 $558 
Western Europe757 753 675 
Emerging Markets (a)495 537 468 
     Other220 204 183 
Applied Water
    United States914 804 754 
Western Europe380 370 316 
Emerging Markets (a)349 324 260 
    Other124 115 104 
Measurement and Control Solutions
     United States857 796 856 
     Western Europe240 256 234 
     Emerging Markets (a)198 189 177 
     Other96 94 96 
Total$5,294 $4,998 $4,681 

(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 1/1/2021$117 $166 
  Additions, net112 117 
  Revenue recognized from opening balance— (117)
  Billings transferred to accounts receivable (103)— 
  Other(1)(2)
Balance at 1/1/2022$125 $164 
  Additions, net115 137 
  Revenue recognized from opening balance— (109)
Billings transferred to accounts receivable(82)— 
  Other(7)(9)
Balance at 12/31/2022$151 $183 

(a) Excludes receivable balances which are disclosed on the balance sheet

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 December 31, 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 $424 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.