Other Assets (Components of Other Assets) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Other Assets [Line Items]
Total	$ 26,574		$ 25,990
Real estate acquired through foreclosure	61		59
Reported Amount | Other assets
Other Assets [Line Items]
Collateral deposits, net	16,541		13,706
Unrealized gains on derivative financial instruments, net	2,879		5,476
Bank-owned life insurance	2,374		2,343
Investments in joint ventures and other unconsolidated entities	1,769		1,644
Accounts receivable	808		950
Receivable for securities settlement	507		195
Income taxes receivable	368		337
Prepaid expenses	315		286
Deferred tax assets, net of valuation allowance	244		263
Deposits with clearing organizations	185		177
Other	584	[1]	613	[1]
Total	$ 26,574		$ 25,990

[1] Included other real estate owned of approximately $61 million and $59 million as of June 30, 2014 and December 31, 2013, respectively.