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Net Capital and Net Capital Requirements for Schwab and optionsXpress, Inc (Detail) (USD $)
Sep. 30, 2011
Schwab
 
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items] 
Net Capital$ 1,307,000,000
% of Aggregate Debit Balances10.00%
Minimum Net Capital Required250,000
2% of Aggregate Debit Balances250,000,000
Net Capital in Excess of Required Net Capital1,057,000,000
Net Capital in Excess of 5% of Aggregate Debit Balances682,000,000
optionsXpress, Inc.
 
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items] 
Net Capital74,000,000
% of Aggregate Debit Balances21.00%
Minimum Net Capital Required1,000,000
2% of Aggregate Debit Balances7,000,000
Net Capital in Excess of Required Net Capital67,000,000
Net Capital in Excess of 5% of Aggregate Debit Balances$ 56,000,000