Deferred Revenue (Tables)

12 Months Ended

Dec. 31, 2019

Contract with Customer, Liability [Abstract]

Schedule of Deferred Revenue

As of December 31, 2019, we estimate that our deferred revenue will be recognized in the following years (in millions):

	Original Listing Revenues		Other Listing Revenues		Data Services and Other Revenues		Total
2020	$	15	$	31	$	83	$	129
2021	4		24		4		32
2022	—		21		1		22
2023	—		11		—		11
2024	—		6		—		6
Thereafter	—		1		—		1
Total	$	19	$	94	$	88	$	201

The changes in our deferred revenue during 2019 and 2018 are as follows (in millions):

	Annual Listing Revenue			Original Listing Revenues			Other Listing Revenues			Data Services and Other Revenues			Total
Deferred revenue balance at January 1, 2018	$	—		$	25		$	98		$	93		$	216
Additions	384			24			38			366			812
Amortization	(384		)	(24		)	(36		)	(367		)	(811		)
Deferred revenue balance at December 31, 2018	—			25			100			92			217
Additions	384			17			36			394			831
Amortization	(384		)	(23		)	(42		)	(398		)	(847		)
Deferred revenue balance at December 31, 2019	$	—		$	19		$	94		$	88		$	201