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Deferred Revenue (Tables)
 9 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
Schedule of Changes in Deferred Revenue The changes in our deferred revenue during the nine months ended September 30, 2019 are as follows (in millions):
 
Annual Listings Revenues
 
Original Listings Revenues
 
Other Listings Revenues
 
Data Services and Other Revenues
 
Total
Deferred revenue balance at December 31, 2018
$
—

 
$
25

 
$
100

 
$
92

 
$
217

Additions
387

 
11

 
30

 
300

 
728

Amortization
(289
)
 
(17
)
 
(30
)
 
(277
)
 
(613
)
Deferred revenue balance at September 30, 2019
$
98

 
$
19

 
$
100

 
$
115

 
$
332


The changes in our deferred revenue during the nine months ended September 30, 2018 are as follows (in millions):
 
Annual Listings Revenues
 
Original Listings Revenues
 
Other Listings Revenues
 
Data Services and Other Revenues
 
Total
Deferred revenue balance at December 31, 2017
$
—

 
$
25

 
$
98

 
$
93

 
$
216

Additions
383

 
17

 
36

 
291

 
727

Amortization
(288
)
 
(17
)
 
(27
)
 
(272
)
 
(604
)
Deferred revenue balance at September 30, 2018
$
95

 
$
25

 
$
107

 
$
112

 
$
339