Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

Financial data for our business segments is as follows in 2018, 2017 and 2016 (in millions):

	Year Ended  December 31, 2018						Year Ended December 31, 2017						Year Ended December 31, 2016
	Trading and Clearing Segment		Data and Listings Segment		Consolidated		Trading and Clearing Segment		Data and Listings Segment		Consolidated		Trading and Clearing Segment		Data and Listings Segment		Consolidated
Revenues:
Energy futures and options contracts	$	965	$	—	$	965	$	909	$	—	$	909	$	865	$	—	$	865
Agricultural and metals futures and options contracts	251		—		251		216		—		216		228		—		228
Financial futures and options contracts	354		—		354		326		—		326		318		—		318
Cash equities and equity options	1,624		—		1,624		1,491		—		1,491		1,780		—		1,780
Fixed income and credit	240		—		240		139		—		139		143		—		143
OTC and other transactions	49		—		49		50		—		50		50		—		50
Pricing and analytics	—		1,043		1,043		—		970		970		—		858		858
Exchange data and feeds	—		670		670		—		632		632		—		602		602
Desktops and connectivity	—		402		402		—		482		482		—		518		518
Listings	—		444		444		—		426		426		—		432		432
Other revenues	234		—		234		202		—		202		177		—		177
Revenues	3,717		2,559		6,276		3,333		2,510		5,843		3,561		2,410		5,971
Transaction-based expenses	1,297		—		1,297		1,205		—		1,205		1,459		—		1,459
Revenues, less transaction-based expenses	2,420		2,559		4,979		2,128		2,510		4,638		2,102		2,410		4,512
Operating expenses	911		1,485		2,396		781		1,478		2,259		826		1,514		2,340
Operating income	$	1,509	$	1,074	$	2,583	$	1,347	$	1,032	$	2,379	$	1,276	$	896	$	2,172

Schedule of Geographical Segments

The following represents our revenues, less transaction-based expenses, net assets and net property and equipment based on the geographic location (in millions):

	United States		Foreign Countries		Total
Revenues, less transaction-based expenses:
Year ended December 31, 2018	$	3,087	$	1,892	$	4,979
Year ended December 31, 2017	$	2,807	$	1,831	$	4,638
Year ended December 31, 2016	$	2,757	$	1,755	$	4,512
Net assets:
As of December 31, 2018	$	9,226	$	8,005	$	17,231
As of December 31, 2017	$	9,152	$	7,833	$	16,985
Property and equipment, net:
As of December 31, 2018	$	1,125	$	116	$	1,241
As of December 31, 2017	$	1,134	$	112	$	1,246