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Financing Receivables (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Y
Dec. 31, 2011
Loans held for sale $ 5,129 $ 114
Percent of loans which are current 99.00% 99.00%
Amount of commercial asset-backed and wholesale real estate loans internally graded doubtful 25 87
Loans outstanding to certain employees, repayment terms, minimum (in years) 1  
Loans outstanding to certain employees, repayment terms, maximum (in years) 12  
Loans outstanding to employees 5,998 5,610
Loans outstanding to employees, allowance 131 119
Substandard
    
Financing receivable credit quality additional information Consumer loans are considered substandard when they are past due 90 cumulative days from the contractual due date. Residential real estate and home equity loans are considered substandard when they are past due more than 90 days and have a loan-to-value ratio greater than 60%, except for home equity loans where the Company does not hold a senior mortgage, which are considered substandard when past due 90 days or more regardless of loan-to-value ratio.  
After-tax Leveraged Investment Arrangements
    
Loans outstanding to employees 172 162
Loans outstanding to employees, allowance 108 133
Commercial and Industrial
    
Amount of gross loans collectively evaluated for impairment 9,419 4,934
Amount of gross loans individually evaluated for impairment 30 163
Gross loans, impairment 19 33
Consumer Loans
    
Amount of gross loans collectively evaluated for impairment 7,613 5,072
Amount of gross loans individually evaluated for impairment 5 100
Residential Real Estate Loans
    
Amount of gross loans collectively evaluated for impairment 6,629 4,675
Wholesale Real Estate Loans
    
Amount of gross loans collectively evaluated for impairment 326 278
Amount of gross loans individually evaluated for impairment 1 50
Gross loans, impairment $ 1 $ 50