Other Assets (Components Of Other Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Deferred tax assets, net of valuation allowance	$ 764		$ 1,249
Income taxes receivable	1,970		1,822
Total	18,016		17,139
Other [Member]
Real estate acquired through foreclosure	65		75
Reported Amount [Member] | Other [Member]
Collateral deposits, net	7,583		6,688
Unrealized gains on derivative financial instruments, net	4,556		6,366
Bank Owned Life Insurance	2,000	[1]	0	[1]
Investments in joint ventures and other unconsolidated entities	1,405		1,060
Accounts receivable	511		431
Deferred tax assets, net of valuation allowance	353		395
Prepaid expenses	267		308
Income taxes receivable	252		989
Deposits with clearing organizations	174		222
Other	915	[2]	680	[2]
Total	$ 18,016		$ 17,139

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

[2] Included other real estate owned of approximately $65 million and $75 million, respectively, related to former CRE loans acquired in 2008 pursuant to indemnified repurchase agreements with an affiliate of Lehman as a result of the Lehman Brothers bankruptcy.