Note 10 - Stock Repurchase Programs (Details) (USD $)	3 Months Ended			12 Months Ended	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Stock Repurchase Programs [Member]	Dec. 31, 2011 Stock Repurchase Programs [Member]	Mar. 31, 2012 Stock Repurchase Program 2010 [Member]
Equity, Class of Treasury Stock [Line Items]
Amount authorized under stock repurchase program					$ 2,000,000,000
Shares Repurchased [Roll Forward]
Shares repurchased, beginning balance			35,000,000
Shares repurchased			7,000,000
Shares repurchased, ending balance	42,000,000			35,000,000
Treasury stock acquired under stock repurchase program, average price per share	$ 32.00		$ 34.27	$ 31.55
Stock Repurchased Value [Roll Forward]
Treasury Stock Value of Shares Repurchased			1,119,000,000
Repurchase of common stock			240,000,000
Treasury Stock Value of Shares Repurchased	1,359,000,000			1,119,000,000
Stock Repurchase Remaining Authorized Amount [Roll Forward]
Stock Repurchase remaining amount authorized, beginning balance	641,000,000		881,000,000
Repurchases of common stock	(240,000,000)	(357,000,000)	(240,000,000)
Stock Repurchase remaining amount authorized, ending balance	$ 641,000,000		$ 881,000,000
Repurchased shares retired during period	0