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Revenue
 12 Months Ended
Dec. 31, 2021
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)202120202019
Revenue from contracts with customers$4,998 $4,681 $5,002 
Lease Revenue197 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)202120202019
Water Infrastructure
     Transport$1,619 $1,484 $1,533 
     Treatment431 400 397 
Applied Water*
     Commercial Building Services609 558 600 
     Residential Building Services268 238 247 
     Industrial Water736 638 694 
Measurement and Control Solutions
     Water1,055 1,039 1,134 
     Energy280 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)202120202019
Water Infrastructure
    United States$556 $558 $593 
Western Europe753 675 658 
     Emerging Markets (a)537 468 491 
     Other204 183 187 
Applied Water
    United States804 754 816 
Western Europe370 316 323 
Emerging Markets (a)324 260 300 
    Other115 104 103 
Measurement and Control Solutions
     United States796 856 972 
     Western Europe256 234 222 
     Emerging Markets (a)189 177 235 
     Other94 96 102 
Total$4,998 $4,681 $5,002 

(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 1/1/2020$106 $135 
  Additions, net118 120 
  Revenue recognized from opening balance— (93)
  Billings transferred to accounts receivable (110)— 
  Other3 4 
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 12/31/2021$125 $164 

(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, 2021, the aggregate amount of the transaction price allocated to performance obligations that are unsatisfied or partially unsatisfied for contracts with performance obligations, amount to $394 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.