Regulatory Requirements (Net Capital and Net Capital Requirements for Schwab and optionsXpress, Inc) (Details) (USD $)	Mar. 31, 2015
Schwab [Member]
Compliance with Regulatory Capital Requirements for Broker Dealers [Line Items]
Net Capital	$ 1,581,000,000
% of Aggregate Debit Balances	10.00%
Minimum Net Capital Required	250,000
2% of Aggregate Debit Balances	331,000,000
Net Capital in Excess of Required Net Capital	1,250,000,000
Net Capital in Excess of 5% of Aggregate Debit Balances	753,000,000
OptionsXpress, Inc. [Member]
Compliance with Regulatory Capital Requirements for Broker Dealers [Line Items]
Net Capital	127,000,000
% of Aggregate Debit Balances	35.00%
Minimum Net Capital Required	1,000,000
2% of Aggregate Debit Balances	7,000,000
Net Capital in Excess of Required Net Capital	120,000,000
Net Capital in Excess of 5% of Aggregate Debit Balances	$ 109,000,000