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, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Held-to-maturity Securities [Line Items]      
Total OTTI losses (unrealized and realized) $ 21 $ 57 $ 360
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]      
Unrealized OTTI losses recognized in accumulated OCI (1) (4) (61)
Net impairment losses recognized in earnings 20 53 299
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]      
Balance, January 1 243 310 2,148
Additions for credit losses recognized on AFS debt securities that had no previous impairment losses 6 7 72
Additions for credit losses recognized on AFS debt securities that had previously incurred impairment losses 14 46 149
Reductions for AFS debt securities matured, sold or intended to be sold (51) (120) (2,059)
Balance, December 31 212 243 310
Residential Mortgage Backed Securities [Member]
      
Schedule of Held-to-maturity Securities [Line Items]      
Total OTTI losses (unrealized and realized) 21 50 348
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]      
Unrealized OTTI losses recognized in accumulated OCI (1) (4) (61)
Net impairment losses recognized in earnings 20 46 287
Residential Mortgage Backed Securities [Member] | Weighted Average [Member]
      
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]      
Prepayment speed 11.60%    
Loss severity 41.30%    
Life default rate 39.40%    
Residential Mortgage Backed Securities [Member] | Weighted Average [Member] | Prime Loan [Member]
      
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]      
Loss severity 38.10%    
Life default rate 27.70%    
Residential Mortgage Backed Securities [Member] | Weighted Average [Member] | Alt-A Loan [Member]
      
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]      
Loss severity 42.00%    
Life default rate 49.10%    
Residential Mortgage Backed Securities [Member] | Weighted Average [Member] | Subprime Loan [Member]
      
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]      
Loss severity 49.90%    
Life default rate 34.10%    
Residential Mortgage Backed Securities [Member] | Tenth Percentile [Member]
      
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]      
Prepayment speed 1.80% [1],[2]    
Loss severity 14.70% [1],[2]    
Life default rate 0.90% [1],[2]    
Residential Mortgage Backed Securities [Member] | Ninetieth Percentile [Member]
      
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]      
Prepayment speed 23.60% [1],[2]    
Loss severity 52.10% [1],[2]    
Life default rate 99.60% [1],[2]    
Commercial Mortgage Backed Securities [Member]
      
Schedule of Held-to-maturity Securities [Line Items]      
Total OTTI losses (unrealized and realized) 0 7 10
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]      
Unrealized OTTI losses recognized in accumulated OCI 0 0 0
Net impairment losses recognized in earnings 0 7 10
Other Debt Obligations [Member]
      
Schedule of Held-to-maturity Securities [Line Items]      
Total OTTI losses (unrealized and realized) 0 0 2
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]      
Unrealized OTTI losses recognized in accumulated OCI 0 0 0
Net impairment losses recognized in earnings $ 0 $ 0 $ 2
[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.