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Note 13 - Employee Retirement Plans (Details) - Net Periodic Benefit Cost of Postretirement Benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Note 13 - Employee Retirement Plans (Details) - Net Periodic Benefit Cost of Postretirement Benefits [Line Items]      
Service cost $ 90 $ 82 $ 70
Interest cost 144 160 131
Amortization of prior service credit 6 6 5
Total net periodic benefit expense 227 103 7
Other changes in plan assets and benefit obligations recognized in other comprehensive income:      
Current year actuarial (gain) loss (191) (212) 264
Amortization of actuarial loss (165) (29) 30
Current year prior service credit   25  
Amortization of prior service credit 6 6 5
Total recognized in other comprehensive (income) loss 19 197 (239)
Total recognized in net periodic benefit cost and other comprehensive (income) loss 246 300 (232)
Other Postretirement Benefit Plan [Member]      
Note 13 - Employee Retirement Plans (Details) - Net Periodic Benefit Cost of Postretirement Benefits [Line Items]      
Service cost 13 11 13
Interest cost 33 38 39
Amortization of net loss 3   15
Amortization of prior service credit (7) (6) (6)
Total net periodic benefit expense 42 43 61
Other changes in plan assets and benefit obligations recognized in other comprehensive income:      
Current year actuarial (gain) loss (96) 49 (178)
Amortization of actuarial loss (3)   (15)
Current year prior service credit   (5) (5)
Amortization of prior service credit 7 6 6
Total recognized in other comprehensive (income) loss (92) 50 (192)
Total recognized in net periodic benefit cost and other comprehensive (income) loss $ (50) $ 93 $ (131)