Note 6 - Income Taxes - Current and Deferred Amounts of Provision (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal									$ (1)	$ (40)	$ (38)
State and municipal									(17)	(20)	(32)
Foreign									(287)	(33)	(414)
Deferred:
Federal									310	(144)	(411)
State and municipal									48	(30)	9
Foreign									(50)	120	(210)
Benefit (provision) for income taxes	$ (832)	$ 27	$ 504	$ 304	$ 55	$ (6)	$ (110)	$ (86)	$ 3	$ (147)	$ (1,096)