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Investments in Securities Other-than-temporary Impairments 3 (Details) (Available-for-sale Securities [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Available-for-sale Securities [Member]
       
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Balance, beginning of period $ 8,870 $ 8,040 $ 8,915 $ 8,215
Additions for the credit component on debt securities for which OTTI was not previously recognized 2 0 2 8
Additions for credit losses on debt securities for which OTTI was previously recognized 597 56 661 92
Reductions for securities no longer in portfolio at period end (2) 0 (2) 0
Reductions for amortizations resulting from changes in cash flows expected to be collected over the remaining life of the securities (101) (220) (210) (439)
Balance, end of period $ 9,366 $ 7,876 $ 9,366 $ 7,876