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Derivative Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2013
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, 2013
Contractual/
Notional
Amount
 
Estimated Fair Value
(In millions)
 
Asset
 
(Liability)
Without hedge designation
 
 
 
 
 
Credit default swaps - purchased protection
$
20

 
$
—

 
$
—

Currency forwards
41

 
—

 
—

Equity warrants
5

 
—

 
—

Total
$
66

 
$
—

 
$
—

December 31, 2012
Contractual/
Notional
Amount
 
Estimated Fair Value
(In millions)
 
Asset
 
(Liability)
Without hedge designation
 
 
 
 
 
Credit default swaps - purchased protection
$
20

 
$
—

 
$
(1
)
Currency forwards
59

 
—

 
(2
)
Equity warrants
5

 
—

 
—

Total
$
84

 
$
—

 
$
(3
)