Note 10 - Stock Repurchase Programs (Details) (USD $)	6 Months Ended		12 Months Ended	6 Months Ended	1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 Stock Repurchase Programs, Combined [Member]	Jun. 30, 2012 Stock Repurchase Program 2012 [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	0
Shares repurchased				17,000,000
Shares repurchased, ending balance	17,000,000		0
Treasury stock acquired under stock repurchase program, average price per share	$ 55.35		$ 51.89	$ 55.42
Stock Repurchased Value [Roll Forward]
Treasury Stock Value of Shares Repurchased	17,000,000
Repurchase of common stock				942,000,000
Treasury Stock Value of Shares Repurchased	959,000,000		17,000,000
Stock Repurchase Remaining Authorized Amount [Roll Forward]
Stock Repurchase remaining amount authorized, beginning balance	1,041,000,000		1,983,000,000
Repurchases of common stock	(942,000,000)	(595,000,000)		(942,000,000)
Stock Repurchase remaining amount authorized, ending balance	$ 1,041,000,000		$ 1,983,000,000
Repurchased shares retired during the period				0