Intangible Assets, Net

12 Months Ended

Dec. 31, 2016

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Intangible assets, net consist of the following (amounts in millions):



	At December 31, 2016
	Estimated useful lives	Gross carrying amount		Accumulated amortization			Net carrying amount
Acquired definite-lived intangible assets:
Internally-developed franchises	3 - 11 years	$	1,154	$	(583	)	$	571
Developed software	3 - 5 years	595		(145		)	450
Customer base	2 years	617		(266		)	351
Trade names	7 - 10 years	54		(8		)	46
Other	1 - 8 years	18		(11		)	7
Total definite-lived intangible assets		$	2,438	$	(1,013	)	$	1,425

Acquired indefinite-lived intangible assets:
Activision trademark	Indefinite						386
Acquired trade names	Indefinite						47
Total indefinite-lived intangible assets							$	433
Total intangible assets, net							$	1,858



	At December 31, 2015
	Estimated useful lives	Gross carrying amount		Accumulated amortization			Net carrying amount
Acquired definite-lived intangible assets:
License agreements and other	1 - 10 years	$	116	$	(93	)	$	23
Internally-developed franchises	11 years	309		(298		)	11
Developed software	5 years	15		—			15
Total definite-lived intangible assets		$	440	$	(391	)	$	49

Acquired indefinite-lived intangible assets:
Activision trademark	Indefinite						386
Acquired trade names	Indefinite						47
Total indefinite-lived intangible assets							$	433
Total intangible assets, net							$	482

The balances of intangible assets presented in the table above at December 31, 2016, does not include license agreement intangible assets that were fully amortized at December 31, 2015, and hence have been removed from the December 31, 2016 balances, as presented. Amortization expense of intangible assets was $708 million, $13 million, and $13 million for the years ended December 31, 2016, 2015, and 2014, respectively.

At December 31, 2016, future amortization of definite-lived intangible assets is estimated as follows (amounts in millions):



2017	$	756
2018	361
2019	216
2020	72
2021	11
Thereafter	9
Total	$	1,425

We did not record any impairment charges against our intangible assets for the years ended December 31, 2016, 2015, and 2014.