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Revenue and Contract Balances
 9 Months Ended
Sep. 30, 2023
Revenue from Contract with Customer [Abstract]  
Revenue and Contract Balances Revenue and Contract Balances
We recognize revenue when or as we satisfy our performance obligations by transferring control of the promised products or services to our customers in an amount that reflects the consideration to which we expect to be entitled in exchange for those products or services.
Beginning in 2023, our chief executive officer, who acts as the chief operating decision maker, manages our business, makes operating decisions and evaluates operating performance on the basis of the company as a whole, instead of on a segment basis as he did prior to 2023. Accordingly, this change resulted in revisions to the nature and substance of information regularly provided to and used by the chief operating decision maker. This serves to align our reported results with our ongoing growth strategy and our intent to provide integrated customer solutions for all tasks and services related to facilitating real estate transactions. As a result, we have determined that we have a single reportable segment. Our revenue is classified into four categories: Residential, Rentals, Mortgages and Other. Certain prior period amounts have been revised to reflect these changes.
The Residential revenue category primarily includes revenue for our Premier Agent and new construction marketplaces, as well as revenue from the sale of other advertising and business technology solutions for real estate professionals, including StreetEasy for-sale product offerings and ShowingTime+. Our Rentals and Mortgages revenue categories remain consistent with our historical presentation, and our Other revenue category primarily includes revenue generated from display advertising.
Disaggregation of Revenue
The following table presents our revenue disaggregated by category for the periods presented (in millions):
Three Months Ended
September 30,		Nine Months Ended
September 30,
2023202220232022
Residential$362 $372 $1,103 $1,182 
Rentals99 74 264 206 
Mortgages24 26 74 101 
Other11 1130 34
Total revenue$496 $483 $1,471 $1,523 
Contract Balances
Contract assets represent our right to consideration in exchange for goods and services that we have transferred to the customer when that right is conditional on something other than the passage of time. Contract assets are primarily related to our Premier Agent Flex, Zillow Lease Connect and StreetEasy Experts offerings, whereby we estimate variable consideration based on the expected number of real estate transactions to be closed for Premier Agent Flex and StreetEasy Experts, and qualified leases to be secured for Zillow Lease Connect. The current portion of contract assets is recorded within prepaid expenses and other current assets and the long-term portion of contract assets is recorded within other assets in our condensed consolidated balance sheets and totaled $89 million and $71 million as of September 30, 2023 and December 31, 2022, respectively.
Contract liabilities consist of deferred revenue, which relates to payments received in advance of performance under a revenue contract. Deferred revenue is primarily related to prepaid advertising fees received or billed in advance of satisfying our performance obligations and prepaid but unrecognized subscription revenue. Deferred revenue is recognized when or as we satisfy our obligations under contracts with customers.
For the three months ended September 30, 2023, the opening balance of deferred revenue was $49 million, of which $46 million was recognized as revenue during the period. For the three months ended September 30, 2022, the opening balance of deferred revenue was $52 million, of which $50 million was recognized as revenue during the period.
For the nine months ended September 30, 2023, the opening balance of deferred revenue was $44 million, of which $43 million was recognized as revenue during the period. For the nine months ended September 30, 2022, the opening balance of deferred revenue was $51 million, of which $51 million was recognized as revenue during the period. As of September 30, 2023 and 2022, deferred revenue was $48 million and $50 million, respectively.