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Derivative Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2014
Summary of Derivative Instruments [Abstract]  
Summary of aggregate contractual or notional amounts and gross estimated fair values related to derivative financial instruments
Derivative Financial Instruments
June 30, 2014
Contractual/
Notional
Amount
 
Estimated Fair Value
(In millions)
 
Asset
 
(Liability)
Without hedge designation
 
 
 
 
 
Currency forwards
$
6

 
$
—

 
$
—

Equity warrants
5

 
—

 
—

Total
$
11

 
$
—

 
$
—


December 31, 2013
Contractual/
Notional
Amount
 
Estimated Fair Value
(In millions)
 
Asset
 
(Liability)
Without hedge designation
 
 
 
 
 
Equity warrants
$
5

 
$
—

 
$
—