Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

The following table presents goodwill activity by reportable segment for the years ended December 31, 2019 and 2018 (in millions):



	December 31, 2017		Goodwill Acquired		Adjustments			December 31, 2018		Goodwill Acquired		Adjustments			December 31, 2019
Marketplace	$	4,186	$	532	$	(124	)	$	4,594	$	—	$	(60	)	$	4,534
StubHub	233		—		(6		)	227		—		(4		)	223
Classifieds	354		—		(15		)	339		65		(8		)	396
Total	$	4,773	$	532	$	(145	)	$	5,160	$	65	$	(72	)	$	5,153

The adjustments to goodwill during the years ended December 31, 2019 and 2018 were primarily due to foreign currency translation. There were no impairments to goodwill in 2019 and 2018.

Intangible Assets

The components of identifiable intangible assets are as follows (in millions, except years):



	December 31, 2019								December 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Useful Life (Years)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Useful Life (Years)
Intangible assets:
Customer lists and user base	$	502	$	(448	)	$	54	5	$	519	$	(445	)	$	74	5
Marketing-related	540		(535		)	5		5	584		(578		)	6		5
Developed technologies	272		(267		)	5		3	278		(269		)	9		3
All other	161		(158		)	3		4	160		(157		)	3		4
Total	$	1,475	$	(1,408	)	$	67		$	1,541	$	(1,449	)	$	92

Amortization expense for intangible assets was $55 million, $63 million and $64 million for the years ended December 31, 2019, 2018 and 2017, respectively.

Expected future intangible asset amortization as of December 31, 2019 is as follows (in millions):



Fiscal year:
2020	$	45
2021	18
2022	2
2023	2
2024	—
Total	$	67