Other Assets, Net

12 Months Ended

Dec. 31, 2019

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Other assets, net, consisted of the following at December 31:



(In millions)	2019		2018
Marketable securities held in trusts⁽¹⁾	$	753	$	642
Computer software, net of accumulated amortization of $1,249 and $1,201 at December 31, 2019 and 2018, respectively	252		261
Other intangible assets, net of accumulated amortization of $873 and $760 at December 31, 2019 and 2018, respectively	283		361
Deferred tax asset⁽²⁾	534		331
Other noncurrent assets, net	552		429
Total	$	2,374	$	2,024


(1)	For further details, refer to “Note 14: Pension and Other Employee Benefits.”


(2)	For further details, refer to “Note 15: Income Taxes.”

Computer software amortization expense was $73 million, $75 million and $71 million in 2019, 2018 and 2017, respectively.

Other intangible assets, net, consisted primarily of completed technology, intellectual property and acquired customer relationships. These intangible assets are being amortized over their estimated useful lives which range from 1 to 15 years using either a straight-line or accelerated amortization method based on the pattern of economic benefits we expect to realize from such assets. Amortization expense for other intangible assets was $112 million, $119 million and $129 million in 2019, 2018 and 2017, respectively.

Computer software and other intangible asset amortization expense is expected to be approximately $154 million in 2020, $118 million in 2021, $80 million in 2022, $45 million in 2023 and $27 million in 2024.