Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
ASSETS
Fair Value	$ 19	$ 19	$ 17
Unearned income on loans	1,460	1,641	1,572
Consolidated guaranteed funds VIEs, for accrued income and other assets	91
Consolidated education loan securitizations trusts VIEs at fair value, Discontinued assets	3,134
LIABILITIES
Consolidated education loan securitization trusts VIEs at fair value, Discontinued liabilities	$ 2,949
Preferred stock, $1 par value, authorized 25,000,000 shares:
Preferred stock, par value	$ 1	$ 1	$ 1
Preferred stock, shares authorized	25,000,000	25,000,000	25,000,000
Common shares, par value	$ 1	$ 1	$ 1
Common shares, shares authorized	1,400,000,000	1,400,000,000	1,400,000,000
Common shares, shares issued	1,016,969,905	946,348,435	946,348,435
Treasury stock, shares	63,147,538	65,833,721	65,740,726
Series A Preferred Stock
Preferred stock, $1 par value, authorized 25,000,000 shares:
Preferred stock, liquidation preference	$ 100	$ 100	$ 100
Preferred stock, shares authorized	7,475,000	7,475,000	7,475,000
Preferred stock, shares issued, Total	2,904,839	2,904,839	2,904,839
Preferred stock, dividend rate	7.75%	7.75%	7.75%
Series B Preferred Stock
Preferred stock, $1 par value, authorized 25,000,000 shares:
Preferred stock, liquidation preference	$ 100,000	$ 100,000	$ 100,000
Preferred stock, shares authorized	25,000	25,000	25,000
Preferred stock, shares issued, Total	25,000	25,000	25,000