Restrictions on Cash and Intercompany Funds Transfers (Details) (USD $) In Billions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Reserve Balances Deposited with Federal Reserve Banks [Abstract]
Average amount of reserve balances deposited by the Firm's bank subsidiaries with various Federal Reserve Banks	$ 5.3	$ 5.6
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Federal Restriction on Secured Borrowings from Subsidiaries, Per Loan, Portion of Subsidiary Total Capital, Percentage	10.00%
Federal Restriction on Secured Borrowings from Subsidiaries, All Loans, Portion of Subsidiary Total Capital, Percentage	20.00%
Cash and Securities Segregated under Federal and Other Regulations Disclosures [Abstract]
Amount of cash that was segregated in special bank accounts for the benefit of securities and futures brokerage customers	17.2	25.1
Amount of securities at fair value that were segregated in special bank accounts for the benefit of securities and futures brokerage customers	1.5	0.7
Restricted cash and cash equivalents	3.9	3.4
Bank and Bank Holding Company Subsidiaries [Member]
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Amount Available for Dividend Distribution by Banking Subsidiaries without Prior Approval from Regulatory Agency	$ 29.8