Restrictions on Cash and Intercompany Funds Transfers (Details) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2015	Jan. 01, 2016	Dec. 31, 2014
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	$ 14.4		$ 10.6
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Percentage of total capital (limited to) loans limited to	10.00%
Percentage of total capital (limited to) for aggregate covered transactions	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	$ 12.6		16.8
Receivables within other assets	16.2		14.9
Amount of securities at fair value that were segregated in special bank accounts for the benefit of securities and futures brokerage customers	20.0		10.1
Restricted cash and cash equivalents	$ 3.7		$ 3.3
Bank and Bank Holding Company Subsidiaries | Subsequent Event
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Aggregate dividends payable		$ 25.0