AMAZON COM INC | 2013 | FY | 3

The following table summarizes gross gains and gross losses realized on sales of available-for-sale marketable securities (in millions):

 
Year Ended December 31,
 
2013
 
2012
 
2011
Realized gains
$
6

 
$
20

 
$
15

Realized losses
(7
)
 
10

 
11

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