Annual report pursuant to Section 13 and 15(d)

Securities - OTTI and Loss (Details)

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Securities - OTTI and Loss (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
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 $ 5 $ 9 $ 51
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]      
Total OTTI losses (unrealized and realized) (57) (360) (2,174)
Unrealized OTTI losses recognized in accumulated OCI 4 61 1,207
Net impairment losses recognized in earnings 53 299 967
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]      
Beginning Balance 310 2,148 3,155
Additions for credit losses recognized on debt securities that had no previous impairment losses 7 72 487
Additions for credit losses recognized on debt securities that had previously incurred impairment losses 46 149 421
Reductions for debt securities sold or intended to be sold (120) (2,059) (1,915)
Ending Balance 243 310 2,148
Residential Mortgage Backed Securities [Member]
      
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]      
Total OTTI losses (unrealized and realized) (50) (348) (1,305)
Unrealized OTTI losses recognized in accumulated OCI 4 61 817
Net impairment losses recognized in earnings 46 287 488
Residential Mortgage Backed Securities [Member] | Weighted Average [Member]
      
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]      
Prepayment speed 12.90%    
Loss Severity 49.50%    
Life Default Rate 52.40%    
Residential Mortgage Backed Securities [Member] | Tenth Percentile [Member]
      
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]      
Prepayment speed 3.10% [1],[2]    
Loss Severity 24.20% [1],[2]    
Life Default Rate 2.40% [1],[2]    
Residential Mortgage Backed Securities [Member] | Ninetieth Percentile [Member]
      
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]      
Prepayment speed 29.70% [1],[2]    
Loss Severity 63.10% [1],[2]    
Life Default Rate 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) (7) (10) (19)
Unrealized OTTI losses recognized in accumulated OCI 0 0 15
Net impairment losses recognized in earnings 7 10 4
Foreign Securities [Member]
      
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]      
Total OTTI losses (unrealized and realized) 0 0 (276)
Unrealized OTTI losses recognized in accumulated OCI 0 0 16
Net impairment losses recognized in earnings 0 0 260
Corporate Bond Securities [Member]
      
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]      
Total OTTI losses (unrealized and realized) 0 0 (6)
Unrealized OTTI losses recognized in accumulated OCI 0 0 2
Net impairment losses recognized in earnings 0 0 4
Other Debt Obligations [Member]
      
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]      
Total OTTI losses (unrealized and realized) 0 (2) (568)
Unrealized OTTI losses recognized in accumulated OCI 0 0 357
Net impairment losses recognized in earnings $ 0 $ 2 $ 211
Prime Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted Average [Member]
      
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]      
Loss Severity 45.80%    
Life Default Rate 39.50%    
Alt-A Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted Average [Member]
      
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]      
Loss Severity 50.60%    
Life Default Rate 63.50%    
Subprime Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted Average [Member]
      
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]      
Loss Severity 55.90%    
Life Default Rate 41.80%    
[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.