Deferred Revenue (Tables)

12 Months Ended

Dec. 31, 2017

Deferred Revenue Disclosure [Abstract]

Schedule of Deferred Revenue Rollforward

The changes in our deferred revenue during the years ended December 31, 2017 and 2016 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, 2016	$	—		$	50		$	59		$	81		$	190
Additions	363			25			71			467			926
Amortization	(363		)	(9		)	(47		)	(460		)	(879		)
Deferred revenue balance at December 31, 2016	—			66			83			88			237
Additions	368			22			54			421			865
Amortization	(368		)	(11		)	(39		)	(421		)	(839		)
Acquisitions, net of divestitures (Note 3)	—			—			—			1			1
Deferred revenue balance at December 31, 2017	$	—		$	77		$	98		$	89		$	264

Schedule of Deferred Revenue Recognition

As of December 31, 2017, 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
2018	$	14	$	24	$	83	$	121
2019	12		28		5		45
2020	12		21		1		34
2021	11		14		—		25
2022	10		9		—		19
Thereafter	18		2		—		20
Total	$	77	$	98	$	89	$	264