Note 13 - Employee Retirement Plans (Details) - Postretirement Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in benefit obligation
Benefit obligation at beginning of year	$ 3,809	$ 3,300
Service cost	90	82	$ 70
Interest cost	144	160	131
Plan participants’ contributions	1	1
Amendments		25
Actuarial (gain) loss	(95)	394
Other	(8)	(3)
Benefits paid	(188)	(207)
Foreign currency translation
Benefit obligation at end of year	3,715	3,809	3,300
Funded status at end of year
Fair value of plan assets				$ 3,058	$ 3,263	$ 2,896
Benefit obligations	(3,809)	(3,809)	(3,300)	(3,715)	(3,809)	(3,300)
Funded status of plans				(657)	(546)
Amounts recognized in the consolidated balance sheets consist of:
Current liability				(35)	(41)
Noncurrent liability				(672)	(552)
Recognized liability				(657)	(546)
Amounts recognized in accumulated other comprehensive income consist of:
Net actuarial loss				(332)	(308)
Prior service credit				35	41
Amount recognized at end of year				367	349
Other Postretirement Benefit Plan [Member]
Change in benefit obligation
Benefit obligation at beginning of year	862	815
Service cost	13	11	13
Interest cost	33	38	39
Plan participants’ contributions	7	7
Amendments		(5)
Actuarial (gain) loss	(97)	49
Other	4
Benefits paid	(61)	(56)
Medicare subsidy received	2	3
Foreign currency translation
Benefit obligation at end of year	763	862	815
Funded status at end of year
Fair value of plan assets				0	0
Benefit obligations	$ (862)	$ (862)	$ (815)	(763)	(862)	$ (815)
Funded status of plans				(763)	(862)
Amounts recognized in the consolidated balance sheets consist of:
Current liability				(45)	(48)
Noncurrent liability				(718)	(814)
Recognized liability				(763)	(862)
Amounts recognized in accumulated other comprehensive income consist of:
Net actuarial loss				33	132
Prior service credit				(19)	(27)
Amount recognized at end of year				$ 14	$ 105