Intangible Assets

Intangible assets, excluding goodwill, include acquired licensed and core technologies, customer relationships, license agreements, trade name, and in-process research and development (IPR&D). Amortization for the intangible assets that have finite useful lives is generally recorded on a straight-line basis over their useful lives.

A summary of the finite-lived identifiable intangible assets is as follows (in millions):



	December 31, 2017							January 1, 2017
	Gross Carrying Amount		Accumulated Amortization			Intangibles, Net		Gross Carrying Amount		Accumulated Amortization			Intangibles, Net
Licensed technologies	$	95	$	(74	)	$	21	$	95	$	(64	)	$	31
Core technologies	300		(161		)	139		328		(142		)	186
Customer relationships	32		(25		)	7		33		(22		)	11
License agreements	14		(8		)	6		14		(7		)	7
Trade name	7		(5		)	2		5		(3		)	2
Total finite-lived intangible assets, net	$	448	$	(273	)	$	175	$	475	$	(238	)	$	237

The estimated annual amortization of finite-lived intangible assets for the next five years is shown in the following table (in millions). Actual amortization expense to be reported in future periods could differ from these estimates as a result of acquisitions, divestitures, and asset impairments, among other factors.



	Estimated Annual Amortization
2018	$	36
2019	32
2020	24
2021	21
2022	17
Thereafter	45
Total	$	175