Acquired Intangible Assets

12 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Acquired Intangible Assets

Acquired Intangible Assets

The Company’s acquired intangible assets with definite useful lives primarily consist of patents and licenses. The following table summarizes the components of acquired intangible asset balances as of September 30, 2017 and September 24, 2016 (in millions):

	2017							2016
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Definite-lived and amortizable acquired intangible assets	$	7,507	$	(5,309	)	$	2,198	$	8,912	$	(5,806	)	$	3,106
Indefinite-lived and non-amortizable acquired intangible assets	100		—			100		100		—			100
Total acquired intangible assets	$	7,607	$	(5,309	)	$	2,298	$	9,012	$	(5,806	)	$	3,206

Amortization expense related to acquired intangible assets was $1.2 billion, $1.5 billion and $1.3 billion in 2017, 2016 and 2015, respectively. As of September 30, 2017, the remaining weighted-average amortization period for acquired intangible assets is 3.4 years. The expected annual amortization expense related to acquired intangible assets as of September 30, 2017, is as follows (in millions):

2018	$	948
2019	505
2020	323
2021	222
2022	131
Thereafter	69
Total	$	2,198