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Delinquency Aging Analysis by Loan Class (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 10,699 $ 9,786
30-59 days past due 31 24
60-89 days past due 4 4
Greater than 90 days 48 52
Total past due 83 80
Total loans to banking clients 10,782 [1] 9,866 [1]
Residential real estate mortgages, first mortgages
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 6,291 5,380
30-59 days past due 22 16
60-89 days past due 2 2
Greater than 90 days 33 39
Total past due 57 57
Total loans to banking clients 6,348 5,437
Residential real estate mortgages, purchased first mortgages
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 154 152
30-59 days past due 1 2
Greater than 90 days 4 5
Total past due 5 7
Total loans to banking clients 159 159
Home equity lines of credit
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 3,269 3,494
30-59 days past due 5 5
60-89 days past due 2 2
Greater than 90 days 11 8
Total past due 18 15
Total loans to banking clients 3,287 3,509
Personal loans secured by securities
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 963 741
30-59 days past due   1
Total past due   1
Total loans to banking clients 963 742
Other
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 22 19
30-59 days past due 3  
Total past due 3  
Total loans to banking clients $ 25 $ 19
[1] Loans are evaluated for impairment by loan segment.