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Additional Information
 12 Months Ended
Dec. 31, 2019
Additional Information [Abstract]  
Additional Information
Additional Information:
 
For the Years Ended December 31,
(in millions)
2019
 
2018
 
2017
Research and development expense
$
465

 
$
383

 
$
453

Advertising expense
$
730

 
$
896

 
$
830

Foreign currency net transaction (gains)/losses
$
(95
)
 
$
21

 
$
49

Interest expense
$
796

 
$
855

 
$
1,096

Interest income
(226
)
 
(190
)
 
(182
)
Interest expense, net
$
570

 
$
665

 
$
914

Total lease cost
$
332

(1) 
$
312

 
$
313


(1) For additional information on total lease costs, see Note 23. Leases.