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
Dec. 31, 2012
Dec. 31, 2011
Carrying Amount
   
Financial Assets:    
Securities held to maturity $ 18,194 $ 15,108
Loans to banking clients - net 10,726 9,812
Loans held for sale   70
Financial Liabilities:    
Long-term debt 1,632 2,001
Fair Value
   
Financial Assets:    
Securities held to maturity 18,732 15,539
Loans to banking clients - net 10,969 9,671
Loans held for sale   73
Financial Liabilities:    
Long-term debt $ 1,782 $ 2,159