Other Assets and Other Liabilities (Components of Other Assets) (Details) (USD $)	Jun. 30, 2013		Dec. 31, 2012
Other Assets [Line Items]
Total	$ 26,602,000,000		$ 18,016,000,000
Real estate acquired through foreclosure	57,000,000		65,000,000
Accrued expenses and other liabilities
Other Assets [Line Items]
Cash collateral received in connection to securities finance activities	5,870,000,000		4,990,000,000
Reported Amount | Other assets
Other Assets [Line Items]
Collateral deposits, net	12,251,000,000		7,649,000,000
Unrealized gains on derivative financial instruments, net	6,135,000,000		4,556,000,000
Bank-owned life insurance	2,014,000,000		2,000,000,000
Receivable for securities sold	1,666,000,000		1,000,000
Investments in joint ventures and other unconsolidated entities	1,391,000,000		1,405,000,000
Accounts receivable	1,214,000,000		511,000,000
Income taxes receivable	346,000,000		252,000,000
Deferred tax assets, net of valuation allowance	315,000,000		353,000,000
Prepaid expenses	297,000,000		267,000,000
Receivable for securities settlement	194,000,000		33,000,000
Deposits with clearing organizations	167,000,000		174,000,000
Other	612,000,000	[1]	815,000,000	[1]
Total	$ 26,602,000,000		$ 18,016,000,000

[1] Included other real estate owned of approximately $57 million and $65 million, respectively.