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Subsequent Events (Tables)
12 Months Ended
Dec. 31, 2011
Subsequent Events [Abstract]  
Rollforward of the deferred tax asset valuation allowance associated with branch restructuring
                         
    Nine Months
Ended
September 30, 2012
 
    Japan     Other
Non-U.S.
Branches
    Total  
    (In millions)  

Balance, beginning of period

  $ 566     $ 154     $ 720  

Income tax expense (benefit)

    10       (11     (1

Deferred income tax expense (benefit) related to unrealized investment gains (losses)

    320       (25     295  

Offsetting reduction in gross deferred tax asset related to the branch transfer to subsidiary

    (896           (896
   

 

 

   

 

 

   

 

 

 

Balance, end of period

  $     $ 118     $ 118