Additional Information

12 Months Ended

Dec. 31, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Additional Information

Additional Information

	For the Years Ended December 31,
(in millions)	2014			2013			2012
Research and development expense	$	167		$	153		$	136
Advertising expense	$	30		$	7		$	6
Interest and other debt expense, net:
Interest expense	$	857		$	1,053		$	1,128
Interest income	(49		)	(4		)	(2		)
	$	808		$	1,049		$	1,126
Rent expense	$	52		$	49		$	49

Minimum rental commitments and sublease income under non-cancelable operating leases in effect at December 31, 2014 were as follows:

(in millions)	Rental Commitments		Sublease Income
2015	$	56	$	5
2016	52		5
2017	41		4
2018	31		4
2019	24		4
Thereafter	118		20
	$	322	$	42

The activity in the allowance for discounts and allowance for returned goods for the years ended December 31, 2014, 2013 and 2012 was as follows:

(in millions)	2014						2013						2012
	Discounts			Returned Goods			Discounts			Returned Goods			Discounts			Returned Goods
Balance at beginning of year	$	—		$	41		$	—		$	42		$	—		$	54
Charged to costs and expenses	599			179			610			150			619			114
Deductions (1)	(599		)	(174		)	(610		)	(151		)	(619		)	(126		)
Balance at end of year	$	—		$	46		$	—		$	41		$	—		$	42

⁽¹⁾ Represents the recording of discounts and returns for which allowances were created.