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Note 20 - Reconciliation of Beginning and Ending Balances of Assets Measured With Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Major US Plans [Member]    
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period $ 3,610  
Fair value of plan assets at end of period 3,707 $ 3,610
Major US Plans [Member] | Real Estate [Member]    
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period 42  
Fair value of plan assets at end of period 37 42
Major US Plans [Member] | Private Equity Funds [Member]    
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period 687  
Fair value of plan assets at end of period 716 687
Major US Plans [Member] | Fair Value, Inputs, Level 3 [Member]    
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period 7 6
Net Realized and Unrealized Gains Relating to Assets Still Held (2) 2
Net Purchases, Sales and Settlements   (1)
Fair value of plan assets at end of period 5 7
Major US Plans [Member] | Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member]    
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period 7 6
Net Realized and Unrealized Gains Relating to Assets Still Held (2) 2
Net Purchases, Sales and Settlements   (1)
Fair value of plan assets at end of period 5 7
Major Non-U.S. Plans [Member]    
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period 661  
Fair value of plan assets at end of period 696 661
Major Non-U.S. Plans [Member] | Real Estate [Member]    
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period 11  
Fair value of plan assets at end of period 12 11
Major Non-U.S. Plans [Member] | Private Equity Funds [Member]    
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period 38  
Fair value of plan assets at end of period 30 38
Major Non-U.S. Plans [Member] | Insurance Contracts [Member]    
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period 317  
Fair value of plan assets at end of period 336 317
Major Non-U.S. Plans [Member] | Fair Value, Inputs, Level 3 [Member]    
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period [1] 273  
Net Realized and Unrealized Gains Relating to Assets Still Held 18  
Fair value of plan assets at end of period 291 273 [1]
Major Non-U.S. Plans [Member] | Fair Value, Inputs, Level 3 [Member] | Insurance Contracts [Member]    
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]    
Fair value of plan assets at beginning of period [1] 273  
Net Realized and Unrealized Gains Relating to Assets Still Held 18  
Fair value of plan assets at end of period $ 291 $ 273 [1]
[1] During 2020 the Company reclassified certain investments from Level 2 to Level 3.