Philip Morris International Inc. | 2013 | FY | 3

Additional Information:
 
For the Years Ended December 31,
(in millions)
2013
 
2012
 
2011
Research and development expense
$
449

 
$
415

 
$
413

Advertising expense
$
435

 
$
483

 
$
464

Interest expense
$
1,104

 
$
1,007

 
$
934

Interest income
(131
)
 
(148
)
 
(134
)
Interest expense, net
$
973

 
$
859

 
$
800

Rent expense
$
334

 
$
318

 
$
308


Minimum rental commitments under non-cancelable operating leases in effect at December 31, 2013, were as follows:

(in millions)
 
2014
$
218

2015
160

2016
124

2017
81

2018
52

Thereafter
211

 
$
846

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