Additional Information

12 Months Ended

Dec. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Additional Information

Additional Information

	For the Years Ended December 31,
(in millions)	2015			2014			2013
Research and development expense	$	186		$	167		$	153
Advertising expense	$	25		$	30		$	7
Interest and other debt expense, net:
Interest expense	$	808		$	857		$	1,053
Interest income	(4		)	(2		)	(4		)
Interest related to NPM Adjustment Items	13			(47		)	—
	$	817		$	808		$	1,049
Rent expense	$	48		$	52		$	49

Minimum rental commitments and sublease income under non-cancelable operating leases in effect at December 31, 2015 were as follows:

(in millions)	Rental Commitments		Sublease Income
2016	$	58	$	6
2017	52		5
2018	45		5
2019	32		5
2020	28		5
Thereafter	94		23
	$	309	$	49

The activity in the allowance for discounts and allowance for returned goods for the years ended December 31, 2015, 2014 and 2013 was as follows:

(in millions)	2015						2014						2013
	Discounts			Returned Goods			Discounts			Returned Goods			Discounts			Returned Goods
Balance at beginning of year	$	—		$	46		$	—		$	41		$	—		$	42
Charged to costs and expenses	618			217			599			179			610			150
Deductions (1)	(618		)	(195		)	(599		)	(174		)	(610		)	(151		)
Balance at end of year	$	—		$	68		$	—		$	46		$	—		$	41

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