Annual report pursuant to Section 13 and 15(d)

Securities Securities - OTTI and Loss (Details)

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Securities Securities - OTTI and Loss (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]      
Total OTTI losses (unrealized and realized) $ (360) $ (2,174) $ (3,508)
Unrealized OTTI losses recognized in accumulated OCI 61 1,207 672
Net impairment losses recognized in earnings 299 967 2,836
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]      
Beginning Balance 2,148 3,155  
Additions for credit losses recognized on debt securities that had no previous impairment losses 72 487  
Additions for credit losses recognized on debt securities that had previously incurred impairment losses 149 421  
Reductions for debt securities sold or intended to be sold (2,059) (1,915)  
Ending Balance 310 2,148 3,155
Residential Mortgage Backed Securities [Member]
     
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]      
Total OTTI losses (unrealized and realized) (348) (1,305) (2,240)
Unrealized OTTI losses recognized in accumulated OCI 61 817 672
Net impairment losses recognized in earnings 287 488 1,568
Residential Mortgage Backed Securities [Member] | Weighted average [Member]
     
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]      
Prepayment speed 10.00%    
Loss Severity 49.00%    
Life Default Rate 50.00%    
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 15.00% [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 22.00% [1],[2]    
Loss Severity 62.00% [1],[2]    
Life Default Rate 100.00% [1],[2]    
Commercial Mortgage Backed Securities [Member]
     
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]      
Total OTTI losses (unrealized and realized) (10) (19) (6)
Unrealized OTTI losses recognized in accumulated OCI   15  
Net impairment losses recognized in earnings 10 4 6
Foreign Securities [Member]
     
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]      
Total OTTI losses (unrealized and realized)   (276) (360)
Unrealized OTTI losses recognized in accumulated OCI   16  
Net impairment losses recognized in earnings   260 360
Corporate Bond Securities [Member]
     
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]      
Total OTTI losses (unrealized and realized)   (6) (87)
Unrealized OTTI losses recognized in accumulated OCI   2  
Net impairment losses recognized in earnings   4 87
Other Debt Obligations [Member]
     
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]      
Total OTTI losses (unrealized and realized) (2) (568) (815)
Unrealized OTTI losses recognized in accumulated OCI   357  
Net impairment losses recognized in earnings $ 2 $ 211 $ 815
Prime Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
     
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]      
Loss Severity 43.00%    
Life Default Rate 36.00%    
Alt-A Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
     
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]      
Loss Severity 50.00%    
Life Default Rate 62.00%    
Subprime Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
     
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]      
Loss Severity 60.00%    
Life Default Rate 72.00%    
[1] The value of a variable below which the indicated percentile of observations will fall
[2] Represents the range of inputs/assumptions based upon the underlying collateral