Goodwill and Other Intangible Assets

The following is a summary of the activity in the goodwill balance (in millions):



Goodwill balance at January 1, 2017	$	12,291
Acquisitions	211
Divestitures	(344		)
Foreign currency translation	63
Other activity, net	(5		)
Goodwill balance at December 31, 2017	12,216
Acquisitions	889
Foreign currency translation	(38		)
Other activity, net	18
Goodwill balance at December 31, 2018	$	13,085

The following is a summary of the activity in the other intangible assets balance (in millions):



Other intangible assets balance at January 1, 2017	$	10,420
Acquisitions	274
Divestitures	(216		)
Foreign currency translation	69
Amortization of other intangible assets	(272		)
Other activity, net	(6		)
Other intangible assets balance at December 31, 2017	10,269
Acquisitions	548
Foreign currency translation	(45		)
Amortization of other intangible assets	(289		)
Other activity, net	(21		)
Other intangible assets balance at December 31, 2018	$	10,462

We completed the acquisitions of BondPoint, CHX Holdings, Inc., TMC Bonds and MERS during 2018, and ICE NGX, CalRock, the ICE BofAML indices, TMX Atrium and NYSE National and sold Trayport, NYSE Governance Services and IDMS during 2017 (Note 3).

The foreign currency translation adjustments result from a portion of our goodwill and other intangible assets being held at our U.K., EU and Canadian subsidiaries, whose functional currencies are not the U.S. dollar. Amortization of other intangible assets in the table above includes an impairment charge of $4 million recorded during 2018 on the remaining value of exchange registration intangible assets in connection with the July 2018 closure of ICE Futures Canada and ICE Clear Canada (Note 14) and the $6 million net impairment loss on the sale of NYSE Governance Services in 2017 (Notes 2 and 3). ICE Futures Canada and ICE Clear Canada were part of our Trading and Clearing segment and NYSE Governance Services was part of our Data and Listings segment. We did not recognize any other impairment losses on goodwill or other intangible assets during 2018 and 2017. The changes in other activity, net, in the tables above primarily relate to adjustments to the fair value of the net tangible assets and intangible assets relating to the acquisitions, with a corresponding adjustment to goodwill.

Other intangible assets and the related accumulated amortization consisted of the following (in millions):



	As of December 31,						Useful Life (Years)
	2018			2017			Useful Life (Years)
Customer relationships	$	4,406		$	3,923		3 to 25
Technology	524			461			2.5 to 11
Trading products with finite lives	237			237			20
Data/databases	150			150			4 to 10
Market data provider relationships	11			11			20
Non-compete agreements	39			38			1 to 5
Other	36			33			1 to 5
	5,403			4,853
Less accumulated amortization	(1,532		)	(1,200		)
Total finite-lived intangible assets, net	3,871			3,653
Exchange registrations, licenses and contracts with indefinite lives	6,253			6,243
Trade names and trademarks with indefinite lives	280			280
In-process research and development	49			85
Other	9			8
Total indefinite-lived intangible assets	6,591			6,616
Total other intangible assets, net	$	10,462		$	10,269

In 2018, 2017 and 2016, amortization of other intangible assets was $289 million, $272 million and $323 million, respectively. Collectively, the remaining weighted average useful lives of the finite-lived intangible assets is 17.7 years as of December 31, 2018. We expect future amortization expense from the finite-lived intangible assets as of December 31, 2018 to be as follows (in millions):



2019	$	303
2020	264
2021	249
2022	241
2023	141
Thereafter	2,673
	$	3,871