6. Other Assets

Other assets (noncurrent) consist of the following at December 31, 2017 and 2016:


	2017		2016
Deferred tax assets	$	194	$	185
Deferred returnable packaging costs		119		115
Repair part inventories		106		107
Capitalized software		82		85
Value added taxes		24		22
Other		77		88
	$	602	$	602

Capitalized software includes costs related to the acquisition and development of internal-use software. These costs are amortized over the estimated useful life of the software. Amortization expense for capitalized software was $12 million, $13 million and $19 million for 2017, 2016, and 2015, respectively. Estimated amortization related to capitalized software through 2022 is as follows: 2018, $13 million; 2019, $14 million; 2020, $13 million; 2021, $12 million; and 2022, $11 million.