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Composition of Loans to Banking Clients by Loan Segment (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans to banking clients $ 10,159 [1]   $ 9,866 [1]      
Allowance for loan losses (57) (51) (54) (53) (50) (53)
Total loans to banking clients - net 10,102   9,812      
Residential real estate mortgages
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans to banking clients 5,982   5,596      
Allowance for loan losses (35) (34) (40) (38) (34) (38)
Home equity lines of credit
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans to banking clients 3,346   3,509      
Allowance for loan losses (22) (17) (14) (15) (16) (15)
Personal loans secured by securities
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans to banking clients 807   742      
Other
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans to banking clients $ 24   $ 19      
[1] All loans are evaluated for impairment by loan segment.