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 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Schedule of Held-to-maturity Securities [Line Items]        
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Held to Maturity, Debt Securities, Unrealized Gain $ 1 $ 2 $ 4 $ 6
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]        
Total OTTI losses (unrealized and realized) (9) (114) (70) (271)
Unrealized OTTI losses recognized in accumulated OCI 3 29 18 53
Net impairment losses recognized in earnings (6) (85) (52) (218)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Beginning Balance 246 930 310 2,148
Additions for credit losses recognized on debt securities that had no previous impairment losses 0 1 6 50
Additions for credit losses recognized on debt securities that had previously incurred impairment losses 6 12 46 96
Reductions for debt securities sold or intended to be sold (8) (672) (118) (2,023)
Ending Balance 244 271 244 271
Residential Mortgage Backed Securities [Member]
        
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]        
Total OTTI losses (unrealized and realized) (9) (114) (64) (269)
Unrealized OTTI losses recognized in accumulated OCI 3 29 18 53
Net impairment losses recognized in earnings (6) (85) (46) (216)
Residential Mortgage Backed Securities [Member] | Weighted average [Member]
        
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Prepayment speed 10.50%   10.50%  
Loss Severity 55.40%   55.40%  
Life Default Rate 56.90%   56.90%  
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 27.90% [1],[2]   27.90% [1],[2]  
Life Default Rate 3.60% [1],[2]   3.60% [1],[2]  
Residential Mortgage Backed Securities [Member] | Ninetieth Percentile [Member]
        
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Prepayment speed 24.70% [1],[2]   24.70% [1],[2]  
Loss Severity 69.90% [1],[2]   69.90% [1],[2]  
Life Default Rate 98.20% [1],[2]   98.20% [1],[2]  
Commercial Mortgage Backed Securities [Member]
        
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]        
Total OTTI losses (unrealized and realized) 0   (6)  
Net impairment losses recognized in earnings 0   (6)  
Other Debt Obligations [Member]
        
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]        
Total OTTI losses (unrealized and realized)   0   (2)
Net impairment losses recognized in earnings   $ 0   $ (2)
Prime Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
        
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Loss Severity 49.50%   49.50%  
Life Default Rate 41.70%   41.70%  
Alt-A Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
        
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Loss Severity 55.00%   55.00%  
Life Default Rate 67.80%   67.80%  
Subprime Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
        
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Loss Severity 67.90%   67.90%  
Life Default Rate 61.00%   61.00%  
[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.