Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Liabilities
Federal funds purchased and securities loaned or sold under repurchase agreements, at fair value	$ 240,103,000,000	$ 213,532,000,000
Other borrowed funds (included $11,591 and $9,576 at fair value)	26,636,000,000	21,908,000,000
Beneficial interests issued by consolidated variable interest entities (included $1,170 and $1,250 at fair value)	63,191,000,000	65,977,000,000
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	200,000,000	200,000,000
Preferred stock, shares issued (in shares)	905,750	780,000
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized (in shares)	9,000,000,000	9,000,000,000
Common stock, shares issued (in shares)	4,104,933,895	4,104,933,895
Shares held in Trust, shares (in shares)	479,126	852,906
Treasury stock, shares (in shares)	(300,981,690)	(332,243,180)
Limited Program Wide Credit Enhancement	3,100,000,000	3,100,000,000
Trading assets
Assets
Assets Pledged	108,784,000,000	89,856,000,000
Securities
Assets
Assets Pledged	71,167,000,000	94,691,000,000
Other assets
Assets
Assets Pledged	1,127,000,000	1,316,000,000
Fair Value, Measurements, Recurring [Member] | Fair value
Assets
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	24,258,000,000	22,191,000,000
Securities borrowed	10,177,000,000	15,308,000,000
Available-for-sale securities	371,145,000,000	364,781,000,000
Loans, at fair value	2,555,000,000	2,097,000,000
Liabilities
Deposits	5,733,000,000	4,933,000,000
Federal funds purchased and securities loaned or sold under repurchase agreements (included $9.5 and $4.1 at fair value)	4,388,000,000	6,817,000,000
Other borrowed funds (included $11,591 and $9,576 at fair value)	11,591,000,000	9,576,000,000
Accounts payable and other liabilities	36,000,000	51,000,000
Long-term debt	30,788,000,000	34,720,000,000
Other assets | Fair Value, Measurements, Recurring [Member] | Fair value
Assets
Other Assets, Fair Value Disclosure	16,458,000,000	16,499,000,000
Long Term Beneficial Interests [Member] | Fair Value, Measurements, Recurring [Member] | Fair value
Liabilities
Beneficial interests issued by consolidated VIEs, at fair value	1,170,000,000	1,250,000,000
Beneficial interests issued by consolidated variable interest entities (included $1,170 and $1,250 at fair value)		$ 1,300,000,000