Other Assets (Components of Other Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Other Assets [Line Items]
Total	$ 23,989		$ 25,990
Real estate acquired through foreclosure	60		59
Reported Amount | Other assets
Other Assets [Line Items]
Collateral deposits, net	13,518		13,706
Unrealized gains on derivative financial instruments, net	3,469		5,476
Bank-owned life insurance	2,359		2,343
Investments in joint ventures and other unconsolidated entities	1,712		1,644
Accounts receivable	687		950
Prepaid expenses	359		286
Income taxes receivable	339		337
Receivable for securities settlement	334		195
Deferred tax assets, net of valuation allowance	249		263
Receivable for securities sold	191		0
Deposits with clearing organizations	183		177
Other	589	[1]	613	[1]
Total	$ 23,989		$ 25,990

[1] Included other real estate owned of approximately $60 million and $59 million as of March 31, 2014 and December 31, 2013, respectively.