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Other Income (Tables)
 6 Months Ended
Jun. 30, 2013
Other (Expense) Income [Abstract]  
Other Income
Other income consists of the following (in millions):
 
Three months ended
June 30,
 
Six months ended
June 30,
 
2013
 
2012
 
2013
 
2012
Equity earnings
$
4

 
$
3

 
$
6

 
$
8

Realized (loss) gain on sale of investments
(2
)
 
(8
)
 
(1
)
 
2

Foreign currency remeasurement (losses) gains
(5
)
 
18

 
19

 
—

Derivative gains (losses)
9

 
(2
)
 
(9
)
 
—

Other
—

 
1

 
—

 
2

 
$
6

 
$
12

 
$
15

 
$
12