v2.4.0.6
Fair Value Estimates for Financial Instruments Excluding Short Term Financial Assets and Liabilities and Financial Instruments Recorded at Fair Value (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Carrying Amount
   
Financial Assets:    
Securities held to maturity $ 15,612 $ 15,108
Loans to banking clients - net 10,102 9,812
Loans held for sale   70
Financial Liabilities:    
Long-term debt 1,776 2,001
Fair Value
   
Financial Assets:    
Securities held to maturity 16,229 15,539
Loans to banking clients - net 10,174 9,671
Loans held for sale   73
Financial Liabilities:    
Long-term debt $ 1,717 $ 2,159