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Additional Information | 12 Months Ended
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Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Additional Information | Additional Information
| For the Years Ended December 31,
(in millions) | 2013 |  |  | 2012 |  |  | 2011 |
Research and development expense | $ | 153 |  |  | $ | 136 |  |  | $ | 128 |
Advertising expense | $ | 7 |  |  | $ | 6 |  |  | $ | 5 |
Interest and other debt expense, net: |  |  |  |  |
Interest expense | $ | 1,053 |  |  | $ | 1,128 |  |  | $ | 1,220 |
Interest income | (4 | ) |  | (2 | ) |  | (4 | )
| $ | 1,049 |  |  | $ | 1,126 |  |  | $ | 1,216 |
Rent expense | $ | 49 |  |  | $ | 49 |  |  | $ | 63 |
Minimum rental commitments and sublease income under non-cancelable operating leases in effect at December 31, 2013, were as follows:
(in millions) | Rental Commitments |  |  | Sublease Income |
2014 | $ | 54 |  |  | $ | 3 |
2015 | 45 |  |  | 5 |
2016 | 39 |  |  | 5 |
2017 | 29 |  |  | 4 |
2018 | 25 |  |  | 5 |
Thereafter | 90 |  |  | 23 |
| $ | 282 |  |  | $ | 45 |

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