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Note 19 - Fair Value Measurement of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Major US Plans [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets $ 3,445 $ 3,804  
Major US Plans [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 44 57  
Major US Plans [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 391 421  
Major US Plans [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 6 40 $ 46
Major US Plans [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 3,004 3,286  
Major US Plans [Member] | Cash and Cash Equivalents [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 50 30  
Major US Plans [Member] | Cash and Cash Equivalents [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 50 30  
Major US Plans [Member] | Equity Securities [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 368 382  
Major US Plans [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 4 60  
Major US Plans [Member] | Equity Securities [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 364 322  
Major US Plans [Member] | Government Bonds [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 1,005 1,179  
Major US Plans [Member] | Government Bonds [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 1,005 1,179  
Major US Plans [Member] | Investment Grade Bonds [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 391 421  
Major US Plans [Member] | Investment Grade Bonds [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 391 421  
Major US Plans [Member] | Real Estate [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 57 94  
Major US Plans [Member] | Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets   26 32
Major US Plans [Member] | Real Estate [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 57 68  
Major US Plans [Member] | Global Balanced Asset Allocation Funds [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 438 597  
Major US Plans [Member] | Global Balanced Asset Allocation Funds [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 438 597  
Major US Plans [Member] | Absolute Return [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 431 489  
Major US Plans [Member] | Absolute Return [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 431 489  
Major US Plans [Member] | Private Equity Funds [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 665 615  
Major US Plans [Member] | Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 6 14 $ 14
Major US Plans [Member] | Private Equity Funds [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 659 601  
Major US Plans [Member] | Derivatives with Unrealized Gains [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 46    
Major US Plans [Member] | Derivatives with Unrealized Gains [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 46    
Major US Plans [Member] | Derivatives with Unrealized Losses [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets (6) (3)  
Major US Plans [Member] | Derivatives with Unrealized Losses [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets (6) (3)  
Major Non-U.S. Plans [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 671 721  
Major Non-U.S. Plans [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 8 7  
Major Non-U.S. Plans [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 399 420  
Major Non-U.S. Plans [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 264 294  
Major Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 13 11  
Major Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 8 6  
Major Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 5 5  
Major Non-U.S. Plans [Member] | Equity Securities [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 21 24  
Major Non-U.S. Plans [Member] | Equity Securities [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 21 24  
Major Non-U.S. Plans [Member] | Government Bonds [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 53 79  
Major Non-U.S. Plans [Member] | Government Bonds [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 53 79  
Major Non-U.S. Plans [Member] | Investment Grade Bonds [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 134 138  
Major Non-U.S. Plans [Member] | Investment Grade Bonds [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 66 62  
Major Non-U.S. Plans [Member] | Investment Grade Bonds [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 68 76  
Major Non-U.S. Plans [Member] | Real Estate [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 9 10  
Major Non-U.S. Plans [Member] | Real Estate [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 9 10  
Major Non-U.S. Plans [Member] | Global Balanced Asset Allocation Funds [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 27 33  
Major Non-U.S. Plans [Member] | Global Balanced Asset Allocation Funds [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 27 33  
Major Non-U.S. Plans [Member] | Absolute Return [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 7 8  
Major Non-U.S. Plans [Member] | Absolute Return [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 7 8  
Major Non-U.S. Plans [Member] | Private Equity Funds [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 42 43  
Major Non-U.S. Plans [Member] | Private Equity Funds [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 42 43  
Major Non-U.S. Plans [Member] | Derivatives with Unrealized Gains [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 1 1  
Major Non-U.S. Plans [Member] | Derivatives with Unrealized Gains [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 1 1  
Major Non-U.S. Plans [Member] | Derivatives with Unrealized Losses [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets (1)    
Major Non-U.S. Plans [Member] | Derivatives with Unrealized Losses [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets (1)    
Major Non-U.S. Plans [Member] | Inflation Linked Bonds      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 4 5  
Major Non-U.S. Plans [Member] | Inflation Linked Bonds | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 4 5  
Major Non-U.S. Plans [Member] | Global High Yield And Emerging Market Debt      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 28 11  
Major Non-U.S. Plans [Member] | Global High Yield And Emerging Market Debt | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 28 11  
Major Non-U.S. Plans [Member] | Insurance Contracts      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 333 358  
Major Non-U.S. Plans [Member] | Insurance Contracts | Fair Value, Inputs, Level 2 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets $ 333 $ 358