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Note 11 - Employee Retirement Plans (Details) - Summary of Net Periodic Benefit Cost - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Pension Plan [Member]        
Note 11 - Employee Retirement Plans (Details) - Summary of Net Periodic Benefit Cost [Line Items]        
Service cost $ 22 $ 30 $ 67 $ 62
Interest cost 36 42 109 118
Expected return on plan assets (44) (45) (133) (131)
Amortization of prior service cost (credit) 2 1 5 4
Recognition of actuarial loss     8  
Total pension and postretirement benefit expense 16 28 56 53
Other Postretirement Benefit Plan [Member]        
Note 11 - Employee Retirement Plans (Details) - Summary of Net Periodic Benefit Cost [Line Items]        
Service cost 3 4 10 9
Interest cost 8 10 24 28
Amortization of net loss 1   3  
Amortization of prior service cost (credit) (2) (3) (5) (5)
Total pension and postretirement benefit expense $ 10 $ 11 $ 32 $ 32