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Additional Information | 12 Months Ended
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Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Additional Information | Additional Information
| For the Years Ended December 31,
(in millions) | 2017 |  |  | 2016 |  |  | 2015 |
Research and development expense | $ | 241 |  |  | $ | 203 |  |  | $ | 186 |
Advertising expense | $ | 29 |  |  | $ | 27 |  |  | $ | 25 |
Interest and other debt expense, net: |  |  |  |  |
Interest expense | $ | 727 |  |  | $ | 754 |  |  | $ | 808 |
Interest income | (31 | ) |  | (13 | ) |  | (4 | )
Interest related to NPM Adjustment Items | 9 |  |  | 6 |  |  | 13 |
| $ | 705 |  |  | $ | 747 |  |  | $ | 817 |
Rent expense | $ | 43 |  |  | $ | 53 |  |  | $ | 48 |
Minimum rental commitments and sublease income under non-cancelable operating leases in effect at December 31, 2017 were as follows:
(in millions) | Rental Commitments |  |  | Sublease Income |
2018 | $ | 38 |  |  | $ | 5 |
2019 | 33 |  |  | 5 |
2020 | 28 |  |  | 5 |
2021 | 26 |  |  | 5 |
2022 | 23 |  |  | 5 |
Thereafter | 44 |  |  | 5 |
| $ | 192 |  |  | $ | 30 |
The activity in the allowance for discounts and allowance for returned goods for the years ended December 31, 2017, 2016 and 2015 was as follows:
(in millions) |  | 2017 |  | 2016 |  | 2015
|  | Discounts |  |  | Returned Goods |  |  | Discounts |  |  | Returned Goods |  |  | Discounts |  |  | Returned Goods |
Balance at beginning of year |  | $ | — |  |  | $ | 49 |  |  | $ | — |  |  | $ | 68 |  |  | $ | — |  |  | $ | 46 |
Charged to costs and expenses |  | 626 |  |  | 130 |  |  | 628 |  |  | 133 |  |  | 618 |  |  | 217 |
Deductions (1) |  | (626 | ) |  | (139 | ) |  | (628 | ) |  | (152 | ) |  | (618 | ) |  | (195 | )
Balance at end of year |  | $ | — |  |  | $ | 40 |  |  | $ | — |  |  | $ | 49 |  |  | $ | — |  |  | $ | 68 |
(1) Represents the recording of discounts and returns for which allowances were created.

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