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Deferred Revenue (Tables)
6 Months Ended
Jun. 30, 2024
Revenue from Contract with Customer [Abstract]  
Schedule of Changes in Deferred Revenue The changes in our deferred revenue during the six months ended June 30, 2024 are as follows (in millions):
Listings RevenuesData Services and Other RevenuesMortgage TechnologyTotal
Deferred revenue balance at January 1, 2024$108 $93 $106 $307 
Additions475 265 66 806 
Amortization
(244)(191)(76)(511)
Deferred revenue balance at June 30, 2024
$339 $167 $96 $602 
The changes in our deferred revenue during the six months ended June 30, 2023 are as follows (in millions):
Listings RevenuesData Services and Other RevenuesMortgage TechnologyTotal
Deferred revenue balance at January 1, 2023$115 $88 $51 $254 
Additions
474 236 32 742 
Amortization
(252)(175)(40)(467)
Deferred revenue balance at June 30, 2023
$337 $149 $43 $529