Intangible Assets, net

The following table summarizes the components of Intangible assets, net (dollars in millions):



	June 30, 2012						December 31, 2011
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Technology and intellectual property	$	7,751	$	5,695	$	2,056	$	7,751	$	5,081	$	2,670
Brands	5,393		447		4,946		5,410		374		5,036
Dealer network and customer relationships	2,123		378		1,745		2,138		322		1,816
Favorable contracts	510		240		270		514		200		314
Other	17		17		—		17		14		3
Total amortizing intangible assets	15,794		6,777		9,017		15,830		5,991		9,839
Non amortizing in process research and development	175				175		175				175
Total intangible assets	$	15,969	$	6,777	$	9,192	$	16,005	$	5,991	$	10,014

The following table summarizes amortization expense related to intangible assets (dollars in millions):



	Three Months Ended				Six Months Ended
	June 30, 2012		June 30, 2011		June 30, 2012		June 30, 2011
Amortization expense related to intangible assets	$	392	$	463	$	790	$	966

The following table summarizes estimated amortization expense related to intangible assets in each of the next five years (dollars in millions):



	2013		2014		2015		2016		2017
Estimated amortization expense	$	1,228	$	611	$	313	$	314	$	311