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Additional Information | 12 Months Ended
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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.

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