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Note 10 - Pension and Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Settlement charge $ 258 $ 258
UNITED STATES | Pension Plan [Member]        
Interest cost 5 17 10 26
Expected return on plan assets (8) (20) (17) (32)
Settlement charge   258   258
Amortization of net actuarial loss 3 10 6 15
Net periodic benefit cost (credit) 0 265 (1) 267
UNITED STATES | Other Postretirement Benefits Plan [Member]        
Interest cost 0   0  
Net periodic benefit cost (credit) 0   0  
Foreign Plan [Member] | Pension Plan [Member]        
Interest cost 2 2 3 4
Expected return on plan assets (1) (1) (2) (2)
Service cost 2 2 4 4
Amortization of net actuarial loss 2 1 4 3
Net periodic benefit cost (credit) 5 4 9 9
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]        
Interest cost 0 0 1 1
Net periodic benefit cost (credit) $ 0 $ 0 $ 1 $ 1