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Composition of Loans to Banking Clients by Loan Segment (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans to banking clients $ 10,782 [1] $ 9,866 [1]    
Allowance for loan losses (56) (54) (53) (45)
Total loans to banking clients - net 10,726 9,812    
Residential real estate mortgages
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans to banking clients 6,507 5,596    
Allowance for loan losses (36) (40) (38)  
Home equity lines of credit
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans to banking clients 3,287 3,509    
Allowance for loan losses (20) (14) (15)  
Personal loans secured by securities
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans to banking clients 963 742    
Other
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans to banking clients $ 25 $ 19    
[1] Loans are evaluated for impairment by loan segment.