Fair Values of Assets and Liabilities (Narrative) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Fair Values of Assets and Liabilities [Abstract]
Fair value of client securities pledged in securities lending transactions to other broker-dealers	$ 1,400,000,000	$ 1,100,000,000
Fair value of borrowed securities from other broker-dealers to fulfill short sales by clients	$ 142,000,000	$ 276,000,000

Amount, after the effects of master netting arrangements, of securities borrowed from entities in exchange for collateral. Includes assets not subject to a master netting arrangement.

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