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Note 16 - Reconciliation of Beginning and Ending Balances of Assets Measured With Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Major US Plans [Member]    
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]    
Fair value of plan assets at beginning of period $ 4,160  
Fair value of plan assets at end of period 3,793 $ 4,160
Major US Plans [Member] | Fair Value, Inputs, Level 3 [Member]    
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]    
Fair value of plan assets at beginning of period 69  
Net Realized and Unrealized Gains/(Losses) 7  
Net Purchases and Sales (18)  
Fair value of plan assets at end of period 58 69
Major US Plans [Member] | Real Estate [Member]    
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]    
Fair value of plan assets at beginning of period 139  
Fair value of plan assets at end of period 130 139
Major US Plans [Member] | Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]    
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]    
Fair value of plan assets at beginning of period 41  
Net Realized and Unrealized Gains/(Losses) 6  
Net Purchases and Sales (13)  
Fair value of plan assets at end of period 34 41
Major US Plans [Member] | Private Equity Funds [Member]    
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]    
Fair value of plan assets at beginning of period 780  
Fair value of plan assets at end of period 768 780
Major US Plans [Member] | Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]    
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]    
Fair value of plan assets at beginning of period 28  
Net Realized and Unrealized Gains/(Losses) 1  
Net Purchases and Sales (5)  
Fair value of plan assets at end of period 24 28
Major Non-U.S. Plans [Member]    
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]    
Fair value of plan assets at beginning of period 795  
Fair value of plan assets at end of period 728 795
Major Non-U.S. Plans [Member] | Fair Value, Inputs, Level 3 [Member]    
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]    
Fair value of plan assets at beginning of period 69 101
Net Realized and Unrealized Gains/(Losses)   (12)
Net Purchases and Sales   (20)
Fair value of plan assets at end of period   69
Major Non-U.S. Plans [Member] | Real Estate [Member]    
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]    
Fair value of plan assets at beginning of period 2  
Fair value of plan assets at end of period 2 2
Major Non-U.S. Plans [Member] | Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]    
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]    
Fair value of plan assets at beginning of period 41 47
Net Purchases and Sales   (6)
Fair value of plan assets at end of period   41
Major Non-U.S. Plans [Member] | Private Equity Funds [Member]    
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]    
Fair value of plan assets at beginning of period 56  
Fair value of plan assets at end of period 61 56
Major Non-U.S. Plans [Member] | Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]    
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]    
Fair value of plan assets at beginning of period $ 28 54
Net Realized and Unrealized Gains/(Losses)   (12)
Net Purchases and Sales   (14)
Fair value of plan assets at end of period   $ 28