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

 
$
—

 
$
—

Currency forwards
27

 
—

 
(1
)
Equity warrants
5

 
—

 
—

Total without hedge designation
52

 
—

 
(1
)
Trading activities
 
 
 
 
 
Futures sold, not yet purchased
17

 
—

 
—

Total
$
69

 
$
—

 
$
(1
)
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
)