Other Intangible Assets

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Other Intangible Assets

Other Intangible Assets

Other intangible assets consist of the following:

	December 31,
	2018			2017
	(In millions)
Customer relationships and contracts	$	827		$	860
Computer software	385			357
Trademarks and tradenames	64			81
Other	27			—
	1,303			1,298
Accumulated amortization	(790		)	(680		)
	$	513		$	618

Amortization expense for amortizable intangible assets, which consist primarily of customer relationships and computer software, was $119 million, $130 million, and $110 million for the years endedDecember 31, 2018,2017and2016, respectively. Estimated amortization expense for the next five years for assets owned at December 31, 2018, is $125 million in 2019, $106 million in 2020, $78 million in 2021, $61 million in 2022 and $43 million in 2023.