Note 6 - Income Taxes (Details) - Current and Deferred Amounts of Provision (Benefit) for Income Taxes - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal									$ 40	$ 38	$ 3
State and municipal									20	32	12
Foreign									33	414	308
Deferred:
Federal									144	411	112
State and municipal									30	(9)	50
Foreign									(120)	210	27
Provision for income taxes	$ (55)	$ 6	$ 110	$ 86	$ 349	$ 395	$ 172	$ 180	$ 147	$ 1,096	$ 512