Other Assets (Components of Other Assets) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Other Assets [Line Items]
Total	$ 34,145		$ 25,990
Real estate acquired through foreclosure	61		59
Reported Amount | Other assets
Other Assets [Line Items]
Collateral deposits, net	17,540		13,706
Unrealized gains on derivative financial instruments, net	8,712		5,476
Bank-owned life insurance	2,391		2,343
Investments in joint ventures and other unconsolidated entities	1,741		1,644
Receivable for securities sold	917		0
Accounts receivable	843		950
Receivable for securities settlement	396		195
Prepaid expenses	307		286
Income taxes receivable	258		337
Deferred tax assets, net of valuation allowance	253		263
Deposits with clearing organizations	231		177
Other	556	[1]	613	[1]
Total	$ 34,145		$ 25,990

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