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Revenue
 6 Months Ended
Jun. 30, 2021
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)2021202020212020
Revenue from contracts with customers$1,302 $1,114 $2,513 $2,188 
Lease Revenue49 46 94 95 
Total$1,351 $1,160 $2,607 $2,283 

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.
Three Months EndedSix Months Ended
June 30,June 30,
(in millions)2021202020212020
Water Infrastructure
     Transport$414 $350 $784 $668 
     Treatment106 105 200 176 
Applied Water
     Commercial Building Services155 133 302 270 
Residential Building Services73 54 140 104 
     Industrial Water186 150 365 301 
Measurement & Control Solutions
     Water288 240 571 505 
     Energy80 82 151 164 
Total$1,302 $1,114 $2,513 $2,188 
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. There has been no change to the Company's reportable segments.
Three Months EndedSix Months Ended
June 30,June 30,
(in millions)2021202020212020
Water Infrastructure
     United States$142 $144 $265 $265 
Western Europe190 157 363 299 
Emerging Markets (a)133 109 255 195 
Other55 45 101 85 
Applied Water
     United States202 183 396 374 
Western Europe99 70 191 144 
Emerging Markets (a)81 61 159 111 
Other32 23 61 46 
Measurement & Control Solutions
     United States224 212 437 433 
Western Europe69 51 143 114 
Emerging Markets (a)49 39 95 80 
Other26 20 47 42 
Total$1,302 $1,114 $2,513 $2,188 

(a)Emerging Markets revenue 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, 2020$106 $135 
  Additions, net63 85 
  Revenue recognized from opening balance— (70)
  Billings transferred to accounts receivable(60)— 
  Other(2)(4)
Balance at June 30, 2020$107 $146 
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 
(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 June 30, 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 $438 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.