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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]        
Total OTTI losses (unrealized and realized) $ (8) $ (9) $ (21) $ (70)
Unrealized OTTI losses recognized in accumulated OCI 1 3 1 18
Net impairment losses recognized in earnings (7) (6) (20) (52)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Beginning Balance 205 246 243 310
Additions for credit losses recognized on debt securities that had no previous impairment losses 1 0 6 6
Additions for credit losses recognized on debt securities that had previously incurred impairment losses 6 6 14 46
Reductions for debt securities sold or intended to be sold 0 (8) (51) (118)
Ending Balance 212 244 212 244
Residential Mortgage Backed Securities [Member]
        
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]        
Total OTTI losses (unrealized and realized) (8) (9) (21) (64)
Unrealized OTTI losses recognized in accumulated OCI 1 3 1 18
Net impairment losses recognized in earnings (7) (6) (20) (46)
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 45.80%   45.80%  
Life Default Rate 44.60%   44.60%  
Residential Mortgage Backed Securities [Member] | Tenth Percentile [Member]
        
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Prepayment speed 1.30% [1],[2]   1.30% [1],[2]  
Loss Severity 16.40% [1],[2]   16.40% [1],[2]  
Life Default Rate 1.30% [1],[2]   1.30% [1],[2]  
Residential Mortgage Backed Securities [Member] | Ninetieth Percentile [Member]
        
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Prepayment speed 22.10% [1],[2]   22.10% [1],[2]  
Loss Severity 59.10% [1],[2]   59.10% [1],[2]  
Life Default Rate 99.70% [1],[2]   99.70% [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 0 0 (6)
Unrealized OTTI losses recognized in accumulated OCI 0 0 0 0
Net impairment losses recognized in earnings $ 0 $ 0 $ 0 $ (6)
Prime Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
        
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Loss Severity 42.60%   42.60%  
Life Default Rate 31.30%   31.30%  
Alt-A Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
        
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Loss Severity 46.40%   46.40%  
Life Default Rate 55.50%   55.50%  
Subprime Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
        
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Loss Severity 54.40%   54.40%  
Life Default Rate 36.30%   36.30%  
[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.