Note 12 - Employee Retirement Plans (Details) - Summary of Net Periodic Benefit Cost - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension Plan [Member]
Note 12 - Employee Retirement Plans (Details) - Summary of Net Periodic Benefit Cost [Line Items]
Service cost	$ 22	$ 16	$ 45	$ 32
Interest cost	37	38	73	76
Expected return on plan assets	(44)	(43)	(89)	(86)
Amortization of prior service cost (credit)	1	1	3	3
Recognition of actuarial loss	8		8
Total pension and postretirement benefit expense	24	12	40	25
Other Postretirement Benefit Plan [Member]
Note 12 - Employee Retirement Plans (Details) - Summary of Net Periodic Benefit Cost [Line Items]
Service cost	4	2	7	5
Interest cost	8	9	16	18
Amortization of net loss	1		2
Amortization of prior service cost (credit)	(2)	(1)	(3)	(2)
Total pension and postretirement benefit expense	$ 11	$ 10	$ 22	$ 21