Note 20 - Fair Value Measurement of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Major US Plans [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	$ 3,610	$ 3,445
Major US Plans [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	(12)	44
Major US Plans [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	457	391
Major US Plans [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	7	6	$ 40
Major US Plans [Member] | Measured at NAV [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	3,158	3,004
Major US Plans [Member] | Cash and Cash Equivalents [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	38	50
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	38	50
Major US Plans [Member] | Equity Securities [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	378	368
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	4
Major US Plans [Member] | Equity Securities [Member] | Measured at NAV [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	374	364
Major US Plans [Member] | Government Bonds [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	1,110	1,005
Major US Plans [Member] | Government Bonds [Member] | Measured at NAV [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	1,110	1,005
Major US Plans [Member] | Investment Grade Bonds [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	457	391
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	457	391
Major US Plans [Member] | Real Estate [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	42	57
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
Major US Plans [Member] | Real Estate [Member] | Measured at NAV [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	42	57
Major US Plans [Member] | Global Balanced Asset Allocation Funds [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	544	438
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	544	438
Major US Plans [Member] | Absolute Return [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	370	431
Major US Plans [Member] | Absolute Return [Member] | Measured at NAV [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	370	431
Major US Plans [Member] | Private Equity Funds [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	687	665
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	7	6	$ 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	680	659
Major US Plans [Member] | Derivatives with Unrealized Gains [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	2	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	2	46
Major US Plans [Member] | Derivatives with Unrealized Losses [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	(18)	(6)
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	(18)	(6)
Major Non-U.S. Plans [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	661	671
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	6	8
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	378	399
Major Non-U.S. Plans [Member] | Measured at NAV [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	277	264
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	13
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	5	8
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	8	5
Major Non-U.S. Plans [Member] | Equity Securities [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	33	21
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	33	21
Major Non-U.S. Plans [Member] | Investment Grade Bonds [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	126	134
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	61	66
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	65	68
Major Non-U.S. Plans [Member] | Real Estate [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	11	9
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	11	9
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	34	27
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	34	27
Major Non-U.S. Plans [Member] | Absolute Return [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	7	7
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	7
Major Non-U.S. Plans [Member] | Private Equity Funds [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	38	42
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	38	42
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] | Government Bonds [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	51	53
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	51	53
Major Non-U.S. Plans [Member] | Inflation Linked Bonds
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	4	4
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	4
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	26	28
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	26	28
Major Non-U.S. Plans [Member] | Insurance Contracts
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	317	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	$ 317	$ 333