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Note 17 - Fair Value Measurement of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Major US Plans [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets $ 3,804 $ 3,653  
Major US Plans [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 57    
Major US Plans [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 421 373  
Major US Plans [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 40 46 $ 58
Major US Plans [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 3,286 3,234  
Major US Plans [Member] | Cash and Cash Equivalents [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 30 107  
Major US 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   1  
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 30 106  
Major US Plans [Member] | Equity Securities [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 382 582  
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 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 322 582  
Major US Plans [Member] | Government Bonds [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 1,179 849  
Major US Plans [Member] | Government Bonds [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 1,179 849  
Major US Plans [Member] | Investment Grade Bonds [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 421 373  
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 421 373  
Major US Plans [Member] | Real Estate [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 94 116  
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 34
Major US Plans [Member] | Real Estate [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 68 84  
Major US Plans [Member] | Global Balanced Asset Allocation Funds [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 597 511  
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 597 511  
Major US Plans [Member] | Absolute Return [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 489 457  
Major US Plans [Member] | Absolute Return [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 489 457  
Major US Plans [Member] | Derivatives with Unrealized Losses [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets (3) (1)  
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 (3) (1)  
Major US Plans [Member] | Private Equity Funds [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 615 659  
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 14 14 $ 24
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 601 645  
Major Non-U.S. Plans [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 721 693  
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 7 6  
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 420 392  
Major Non-U.S. Plans [Member] | Measured at NAV [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 294 295  
Major Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 11 18  
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 6 9  
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 9  
Major Non-U.S. Plans [Member] | Equity Securities [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 24 28  
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 24 28  
Major Non-U.S. Plans [Member] | Government Bonds [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 79 86  
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 79 86  
Major Non-U.S. Plans [Member] | Investment Grade Bonds [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 138 116  
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 62 59  
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 76 57  
Major Non-U.S. Plans [Member] | Real Estate [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 10 6  
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 10 6  
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 33 29  
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 33 29  
Major Non-U.S. Plans [Member] | Absolute Return [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 8 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 8 8  
Major Non-U.S. Plans [Member] | Private Equity Funds [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 43 56  
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 43 56  
Major Non-U.S. Plans [Member] | Inflation Linked Bonds      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 5 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 5 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 11 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 11 11  
Major Non-U.S. Plans [Member] | Insurance Contracts      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 358 333  
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 358 333  
Major Non-U.S. Plans [Member] | Derivatives With Unrealized Gains      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets 1 (3)  
Major Non-U.S. Plans [Member] | Derivatives With Unrealized Gains | Fair Value, Inputs, Level 1 [Member]      
Fair Value Measurement Of Plan Assets [Line Items]      
Fair Value of Plan Assets $ 1 $ (3)