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Additional Information | 12 Months Ended
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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.

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