Summary of Other Securities Owned (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Other Securities Owned [Line Items]
Other securities owned	$ 636	$ 593
Schwab Funds money market funds
Other Securities Owned [Line Items]
Other securities owned	329	332
Equity and bond mutual funds
Other Securities Owned [Line Items]
Other securities owned	217	183
State and municipal debt obligations
Other Securities Owned [Line Items]
Other securities owned	48	46
Equity, U.S. Government and corporate debt, and other securities
Other Securities Owned [Line Items]
Other securities owned	$ 42	$ 32

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

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