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Composition of Loans to Banking Clients by Loan Segment (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans to banking clients $ 11,359 [1] $ 10,782 [1]    
Allowance for loan losses (59) (56) (50) (54)
Total loans to banking clients - net 11,300 10,726    
Residential real estate mortgages
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans to banking clients 7,102 6,507    
Allowance for loan losses (40) (36) (37) (40)
Home equity lines of credit
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans to banking clients 3,193 3,287    
Allowance for loan losses (19) (20) (13) (14)
Personal loans secured by securities
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans to banking clients 1,035 963    
Other
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans to banking clients $ 29 $ 25    
[1] All loans are evaluated for impairment by loan segment.