Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Fair Value	$ 2,133	$ 17
Unearned income on loans	1,388	1,572
Consolidated guaranteed funds VIEs, for accrued income and other assets	82
Consolidated education loan securitizations trusts VIEs at fair value, Discontinued assets	2,761
Aggregate amount of certificates of deposit	$100,000 or more	$100,000 or more
Consolidated education loan securitization trusts VIEs at fair value, Discontinued liabilities	$ 2,549
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	25,000,000	25,000,000
Common shares, par value	$ 1	$ 1
Common shares, shares authorized	1,400,000,000	1,400,000,000
Common shares, shares issued	1,016,969,905	946,348,435
Treasury stock, shares	63,962,113	65,740,726
Series A Preferred Stock
Preferred stock, liquidation preference	$ 100	$ 100
Preferred stock, shares authorized	7,475,000	7,475,000
Preferred stock, shares issued, Total	2,904,839	2,904,839
Preferred stock, dividend rate	7.75%	7.75%
Series B Preferred Stock
Preferred stock, liquidation preference	$ 100,000	$ 100,000
Preferred stock, shares authorized	25,000	25,000
Preferred stock, shares issued, Total	25,000	25,000