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Other Intangible Assets

12 Months Ended

Dec. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

OTHER INTANGIBLE ASSETS

Other intangible assets consisted of the following:

December 31, 2019	Gross Cost		Accumulated Amortization			Net Cost
Technologies & licenses		699		(578	)		121
Purchased & internally developed software		486		(427	)		59
Technologies in progress		119		—			119
Other intangible assets		70		(70	)		—
Total		1,374		(1,075	)		299

December 31, 2018	Gross Cost		Accumulated Amortization			Net Cost
Technologies & licenses		705		(592	)		113
Purchased & internally developed software		459		(404	)		55
Technologies in progress		44		—			44
Other intangible assets		69		(69	)		—
Total		1,277		(1,065	)		212

As described in Note 7, the acquisition of Norstel resulted in the recognition of technology in process for $86 million in the line “Technologies in progress”.

The line “Technologies in progress” in the table above also includes internally developed software under construction and software not ready for use.

The amortization expense in 2019, 2018 and 2017 was $69 million, $64 million and $58 million, respectively.

The estimated amortization expense of the existing intangible assets for the following years is:

Year
2020			81
2021			62
2022			45
2023			27
2024			17
Thereafter			67
Total			299

In both 2019 and 2018, the Company impaired $4 million and $2 million, respectively, of acquired licenses and technologies for which it was determined that they had no alternative future use, while in 2017, there was no impairment of intangible assets.