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Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 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
December 31, 2014
Contractual/
Notional
Amount
 
Estimated Fair Value
(In millions)
 
Asset
 
(Liability)
Without hedge designation
 
 
 
 
 
Currency forwards
$
9

 
$
—

 
$
—

Equity warrants
5

 
—

 
—

Embedded derivative on funds withheld liability
184

 
—

 
(3
)
Total


 
$
—

 
$
(3
)

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

 
$
—

 
$
—