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Securities - OTTI and Loss (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]        
Total OTTI losses (unrealized and realized) $ (13) $ (63) $ (62) $ (157)
Unrealized OTTI losses recognized in accumulated OCI 7 18 16 24
Net impairment losses recognized in earnings (6) (45) (46) (133)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Beginning Balance 266 884 310 2,135
Additions for credit losses recognized on debt securities that had no previous impairment losses 4 16 6 49
Additions for credit losses recognized on debt securities that had previously incurred impairment losses 2 29 40 84
Reductions for debt securities sold or intended to be sold (26) (11) (110) (1,350)
Ending Balance 246 918 246 918
Residential Mortgage Backed Securities [Member]
       
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]        
Total OTTI losses (unrealized and realized) (9) (48) (56) (142)
Unrealized OTTI losses recognized in accumulated OCI 7 17 16 23
Net impairment losses recognized in earnings (2) (31) (40) (119)
Residential Mortgage Backed Securities [Member] | Weighted average [Member]
       
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Prepayment speed 9.40%   9.40%  
Loss Severity 51.70%   51.70%  
Life Default Rate 59.20%   59.20%  
Residential Mortgage Backed Securities [Member] | Tenth Percentile [Member]
       
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Prepayment speed 3.00% [1],[2]   3.00% [1],[2]  
Loss Severity 25.00% [1],[2]   25.00% [1],[2]  
Life Default Rate 3.80% [1],[2]   3.80% [1],[2]  
Residential Mortgage Backed Securities [Member] | Ninetieth Percentile [Member]
       
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Prepayment speed 22.10% [1],[2]   22.10% [1],[2]  
Loss Severity 65.30% [1],[2]   65.30% [1],[2]  
Life Default Rate 99.10% [1],[2]   99.10% [1],[2]  
Commercial Mortgage Backed Securities [Member]
       
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]        
Total OTTI losses (unrealized and realized) (4)   (6)  
Net impairment losses recognized in earnings (4)   (6)  
Foreign Securities [Member]
       
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]        
Total OTTI losses (unrealized and realized)   (12)   (12)
Net impairment losses recognized in earnings   (12)   (12)
Other Debt Obligations [Member]
       
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]        
Total OTTI losses (unrealized and realized)   (3)   (3)
Unrealized OTTI losses recognized in accumulated OCI   1   1
Net impairment losses recognized in earnings   $ (2)   $ (2)
Prime Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
       
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Loss Severity 46.00%   46.00%  
Life Default Rate 46.00%   46.00%  
Alt-A Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
       
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Loss Severity 53.00%   53.00%  
Life Default Rate 70.00%   70.00%  
Subprime Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
       
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Loss Severity 62.00%   62.00%  
Life Default Rate 65.00%   65.00%  
[1] Represents the range of inputs/assumptions based upon the underlying collateral.
[2] The value of a variable below which the indicated percentile of observations will fall.