Deferred Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue Recognition [Abstract]

Schedule of Deferred Revenue

The changes in our deferred revenue during the three months endedMarch 31, 2018 are as follows (in millions), adjusted to reflect the adoption of ASC 606 as discussed in Note 2:

	Annual Listings Revenue			Original Listings Revenues			Other Listings Revenues			Data Services and Other Revenues			Total
Deferred revenue balance at December 31, 2017	$	—		$	25		$	98		$	93		$	216
Additions	380			7			15			147			549
Amortization	(95		)	(6		)	(8		)	(96		)	(205		)
Deferred revenue balance at March 31, 2018	$	285		$	26		$	105		$	144		$	560

The changes in our deferred revenue during the three months endedMarch 31, 2017 are as follows (in millions), adjusted to reflect the adoption of ASC 606 as discussed in Note 2:

	Annual Listings Revenue			Original Listings Revenues			Other Listings Revenues			Data Services and Other Revenues			Total
Deferred revenue balance at December 31, 2016	$	—		$	23		$	83		$	88		$	194
Additions	361			2			24			148			535
Amortization	(91		)	(5		)	(12		)	(100		)	(208		)
Deferred revenue balance at March 31, 2017	$	270		$	20		$	95		$	136		$	521

Deferred Revenue, by Arrangement, Disclosure

As of March 31, 2018, we estimate that our deferred revenue will be recognized in the following years (in millions):

	Annual Listings Revenue		Original Listing Revenues		Other Listing Revenues		Data Services and Other Revenues		Total
Remainder of 2018	$	285	$	18	$	18	$	132	$	453
2019	—		8		31		9		48
2020	—		—		25		2		27
2021	—		—		17		1		18
2022	—		—		12		—		12
Thereafter	—		—		2		—		2
Total	$	285	$	26	$	105	$	144	$	560