Quarterly report pursuant to Section 13 or 15(d)

Securities - OTTI and Loss (Details)

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Securities - OTTI and Loss (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]    
Total OTTI losses (unrealized and realized) $ (51) $ (111)
Unrealized OTTI losses recognized in accumulated OCI 11 23
Net impairment losses recognized in earnings (40) (88)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Beginning Balance 310 2,135
Additions for credit losses recognized on debt securities that had no previous impairment losses 2 33
Additions for credit losses recognized on debt securities that had previously incurred impairment losses 38 55
Reductions for debt securities sold or intended to be sold (84) (1,339)
Ending Balance 266 884
Residential Mortgage Backed Securities [Member]
   
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]    
Total OTTI losses (unrealized and realized) (49) (110)
Unrealized OTTI losses recognized in accumulated OCI 11 23
Net impairment losses recognized in earnings (38) (87)
Residential Mortgage Backed Securities [Member] | Weighted average [Member]
   
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Prepayment speed 9.00%  
Loss Severity 51.00%  
Life Default Rate 54.00%  
Residential Mortgage Backed Securities [Member] | Tenth Percentile [Member]
   
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Prepayment speed 3.00% [1],[2]  
Loss Severity 18.00% [1],[2]  
Life Default Rate 2.00% [1],[2]  
Residential Mortgage Backed Securities [Member] | Ninetieth Percentile [Member]
   
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Prepayment speed 20.00% [1],[2]  
Loss Severity 64.00% [1],[2]  
Life Default Rate 99.00% [1],[2]  
Commercial Mortgage Backed Securities [Member]
   
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]    
Total OTTI losses (unrealized and realized) (2)  
Net impairment losses recognized in earnings (2) 0
Other Debt Obligations [Member]
   
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]    
Total OTTI losses (unrealized and realized)   (1)
Net impairment losses recognized in earnings $ 0 $ (1)
Prime Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
   
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Loss Severity 46.00%  
Life Default Rate 40.00%  
Alt-A Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
   
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Loss Severity 51.00%  
Life Default Rate 64.00%  
Subprime Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
   
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Loss Severity 62.00%  
Life Default Rate 71.00%  
[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.