Other Assets (Components of Other Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Other Assets [Line Items]
Deferred tax assets, net of valuation allowance	$ 895	[1]	$ 764	[1]
Total	25,990		18,016
Real estate acquired through foreclosure	59		65
Reported Amount | Other assets
Other Assets [Line Items]
Collateral deposits, net	13,706		7,649
Unrealized gains on derivative financial instruments, net	5,476		4,556
Bank-owned life insurance	2,343	[2]	2,000	[2]
Investments in joint ventures and other unconsolidated entities	1,644		1,405
Accounts receivable	950		511
Income taxes receivable	337		252
Prepaid expenses	286		267
Deferred tax assets, net of valuation allowance	263	[3]	353	[3]
Receivable for securities settlement	195		33
Deposits with clearing organizations	177		174
Other	613	[4]	816	[4]
Total	$ 25,990		$ 18,016

[1] Amount as of December 31, 2013 reflected a decrease of $50 million associated with an out-of-period income tax benefit recorded in 2013.

[2] Represented the cash surrender values of a bankruptcy-remote, separate-account policy, and a general-account policy, both composed of aggregate life insurance coverage purchased by State Street Bank on certain of its employees, where State Street Bank is the sole beneficiary. The separate account mainly included cash and highly-rated investment securities carried at fair value.

[3] Deferred tax assets and liabilities recorded in our consolidated statement of condition are netted within the same tax jurisdiction. Gross deferred tax assets and liabilities are presented in note 23.

[4] Included other real estate owned of approximately $59 million and $65 million as of December 31, 2013 and December 31, 2012, respectively.