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, 2013
Mar. 31, 2012
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 14 $ 51
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities (5) (11)
Other than Temporary Impairment Losses, Investments 9 40
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Beginning Balance 243 310
Additions for credit losses recognized on debt securities that had no previous impairment losses 4 2
Additions for credit losses recognized on debt securities that had previously incurred impairment losses 5 38
Reductions for debt securities sold or intended to be sold (8) (84)
Ending Balance 244 266
Residential Mortgage Backed Securities [Member]
   
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 14 49
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities (5) (11)
Other than Temporary Impairment Losses, Investments 9 38
Residential Mortgage Backed Securities [Member] | Weighted average [Member]
   
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Prepayment speed 11.00%  
Loss Severity 50.50%  
Life Default Rate 55.20%  
Residential Mortgage Backed Securities [Member] | Tenth Percentile [Member]
   
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Prepayment speed 1.00% [1],[2]  
Loss Severity 24.50% [1],[2]  
Life Default Rate 2.60% [1],[2]  
Residential Mortgage Backed Securities [Member] | Ninetieth Percentile [Member]
   
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Prepayment speed 25.70% [1],[2]  
Loss Severity 65.30% [1],[2]  
Life Default Rate 99.90% [1],[2]  
Commercial Mortgage Backed Securities [Member]
   
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 0 2
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities 0 0
Other than Temporary Impairment Losses, Investments $ 0 $ 2
Prime Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
   
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Loss Severity 44.80%  
Life Default Rate 39.00%  
Alt-A Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
   
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Loss Severity 49.60%  
Life Default Rate 64.40%  
Subprime Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
   
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]    
Loss Severity 62.10%  
Life Default Rate 59.70%  
[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.