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
Mar. 31, 2014
Mar. 31, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Beginning Balance $ 184 $ 243
Additions for credit losses recognized on AFS debt securities that had no previous impairment losses 0 4
Additions for credit losses recognized on AFS debt securities that had previously incurred impairment losses 1 5
Reductions for AFS debt securities matured, sold or intended to be sold 0 (8)
Ending Balance 185 244
Residential Mortgage Backed Securities [Member]
    
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]    
Total OTTI losses (unrealized and realized) (1) (14)
Unrealized OTTI losses recognized in accumulated OCI 0 5
Net impairment losses recognized in earnings $ (1) $ (9)
Residential Mortgage Backed Securities [Member] | Weighted average [Member]
    
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Prepayment speed 11.40%  
Loss Severity 39.50%  
Life Default Rate 37.70%  
Residential Mortgage Backed Securities [Member] | Weighted average [Member] | Prime Loan [Member]
    
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Loss Severity 36.90%  
Life Default Rate 26.30%  
Residential Mortgage Backed Securities [Member] | Weighted average [Member] | Alt-A Loan [Member]
    
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Loss Severity 40.00%  
Life Default Rate 46.90%  
Residential Mortgage Backed Securities [Member] | Weighted average [Member] | Subprime Loan [Member]
    
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Loss Severity 47.50%  
Life Default Rate 32.30%  
Residential Mortgage Backed Securities [Member] | Tenth Percentile [Member]
    
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Prepayment speed 1.70% [1],[2]  
Loss Severity 13.90% [1],[2]  
Life Default Rate 0.80% [1],[2]  
Residential Mortgage Backed Securities [Member] | Ninetieth Percentile [Member]
    
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Prepayment speed 23.00% [1],[2]  
Loss Severity 49.20% [1],[2]  
Life Default Rate 99.50% [1],[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.