Intangible Assets - (Notes)

3 Months Ended

Mar. 31, 2016

Intangible Assets, Net (Excluding Goodwill) [Abstract]

INTANGIBLE ASSETS

Intangible assets are comprised of the following:



	March 31, 2016						December 31, 2015
	Gross Carrying Amount		Less: Accumulated Amortization		Net		Gross Carrying Amount		Less: Accumulated Amortization		Net
Technology	$	867	$	467	$	400	$	866	$	452	$	414
Customer relationships ⁽¹⁾	209		83		126		251		106		145
Trade names	108		90		18		108		89		19
Other	18		13		5		18		13		5
Total intangible assets	$	1,202	$	653	$	549	$	1,243	$	660	$	583


⁽¹⁾	During the first quarter of 2016, we recorded impairments relating to our customer relationship intangible assets totaling $12 million. See Note 3. "Impairment and Restructuring Charges" for further discussion.

Intangible assets are generally amortized on a straight-line basis with estimated useful lives ranging from 3 to 30 years. Amortization expense for the three months ended March 31, 2016 was $22 million, as compared to $26 million reported in 2015 for the same period.

Amortization expense of these intangibles over the remainder of 2016 and for each of the subsequent five fiscal years is expected to be as follows:



Year	Estimated Amortization Expense
Remainder of 2016	$	63
2017	81
2018	74
2019	71
2020	61
2021	53