Note 20 - Fair Value Measurement of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018
Major US Plans [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	$ 3,707	$ 3,610
Major US Plans [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	(3)	(12)
Major US Plans [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	451	457
Major US Plans [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	5	7		$ 6
Major US Plans [Member] | Measured at NAV [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	3,254	3,158
Major US Plans [Member] | Cash and Cash Equivalents [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	66	38
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	66	38
Major US Plans [Member] | Equity Securities [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	383	378
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
Major US Plans [Member] | Equity Securities [Member] | Measured at NAV [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	383	374
Major US Plans [Member] | Government Bonds [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	1,102	1,110
Major US Plans [Member] | Government Bonds [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] | Government Bonds [Member] | Measured at NAV [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	1,101	1,110
Major US Plans [Member] | Investment Grade Bonds [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	446	457
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	446	457
Major US Plans [Member] | Real Estate [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	37	42
Major US Plans [Member] | Real Estate [Member] | Measured at NAV [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	37	42
Major US Plans [Member] | Global Balanced Asset Allocation Funds [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	514	544
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	514	544
Major US Plans [Member] | Absolute Return [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	447	370
Major US Plans [Member] | Absolute Return [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	5
Major US Plans [Member] | Absolute Return [Member] | Measured at NAV [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	442	370
Major US Plans [Member] | Private Equity Funds [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	716	687
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	5	7		$ 6
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	711	680
Major US Plans [Member] | Derivatives with Unrealized Gains [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	3	2
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	3	2
Major US Plans [Member] | Derivatives with Unrealized Losses [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	(7)	(18)
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	(7)	(18)
Major Non-U.S. Plans [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	696	661
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	135	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	135	378
Major Non-U.S. Plans [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	291	273	[1]
Major Non-U.S. Plans [Member] | Measured at NAV [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	135	277
Major Non-U.S. Plans [Member] | Cash and Cash Equivalents [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	17	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	10	5
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	7	8
Major Non-U.S. Plans [Member] | Equity Securities [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	36	33
Major Non-U.S. Plans [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	36
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
Major Non-U.S. Plans [Member] | Investment Grade Bonds [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	177	126
Major Non-U.S. Plans [Member] | Investment Grade Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	87
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	90	61
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
Major Non-U.S. Plans [Member] | Real Estate [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	12	11
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	12	11
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	38	34
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	38	34
Major Non-U.S. Plans [Member] | Absolute Return [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets		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
Major Non-U.S. Plans [Member] | Private Equity Funds [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	30	38
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	30	38
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
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
Major Non-U.S. Plans [Member] | Government Bonds [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	48	51
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	48	51
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	2	26
Major Non-U.S. Plans [Member] | Global High Yield And Emerging Market Debt | Fair Value, Inputs, Level 1 [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	2
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
Major Non-U.S. Plans [Member] | Insurance Contracts
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	336	317
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	45	317
Major Non-U.S. Plans [Member] | Insurance Contracts | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets	$ 291	273	[1]
Major Non-U.S. Plans [Member] | Inflation Linked Bonds [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets		4
Major Non-U.S. Plans [Member] | Inflation Linked Bonds [Member] | Measured at NAV [Member]
Fair Value Measurement Of Plan Assets [Line Items]
Fair Value of Plan Assets		$ 4

[1] During 2020 the Company reclassified certain investments from Level 2 to Level 3.