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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract]        
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 5 $ 13 $ 14 $ 62
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities (1) (7) (1) (16)
Other than Temporary Impairment Losses, Investments 4 6 13 46
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Beginning Balance 244 266 243 310
Additions for credit losses recognized on debt securities that had no previous impairment losses 0 4 5 6
Additions for credit losses recognized on debt securities that had previously incurred impairment losses 4 2 8 40
Reductions for debt securities sold or intended to be sold (43) (26) (51) (110)
Ending Balance 205 246 205 246
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 5 9 14 56
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities (1) (7) (1) (16)
Other than Temporary Impairment Losses, Investments 4 2 13 40
Residential Mortgage Backed Securities [Member] | Weighted average [Member]
        
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Prepayment speed 12.40%   12.40%  
Loss Severity 43.10%   43.10%  
Life Default Rate 44.80%   44.80%  
Residential Mortgage Backed Securities [Member] | Tenth Percentile [Member]
        
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Prepayment speed 1.40% [1],[2]   1.40% [1],[2]  
Loss Severity 16.90% [1],[2]   16.90% [1],[2]  
Life Default Rate 1.20% [1],[2]   1.20% [1],[2]  
Residential Mortgage Backed Securities [Member] | Ninetieth Percentile [Member]
        
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Prepayment speed 25.80% [1],[2]   25.80% [1],[2]  
Loss Severity 55.00% [1],[2]   55.00% [1],[2]  
Life Default Rate 99.80% [1],[2]   99.80% [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 4 0 6
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 0 0
Other than Temporary Impairment Losses, Investments $ 0 $ 4 $ 0 $ 6
Prime Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
        
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Loss Severity 39.50%   39.50%  
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 44.10%   44.10%  
Life Default Rate 56.50%   56.50%  
Subprime Loan [Member] | Residential Mortgage Backed Securities [Member] | Weighted average [Member]
        
Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract]        
Loss Severity 50.80%   50.80%  
Life Default Rate 38.20%   38.20%  
[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.