Note 20 - Changes in Major Plan Assets and Benefit Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Changes In Plan Assets And Benefit Recognized In Other Comprehensive Income Loss [Line Items]
Newly established gain (loss)		$ (34)	$ (14)
Amortization of:
Prior service credit	[1]	(7)	(8)
Net actuarial loss	[1]	(19)	(4)
Curtailment gain recognized in expense	[1]	(9)	2
U.S. [Member]
Changes In Plan Assets And Benefit Recognized In Other Comprehensive Income Loss [Line Items]
Newly established gain (loss)			16
Amortization of:
Prior service credit		(7)	(7)
Net actuarial loss		15
Curtailment gain recognized in expense			(2)
Net loss recognized in expense due to settlement		9
Total income (loss) recognized in Other comprehensive income		17	7
Non-US [Member]
Changes In Plan Assets And Benefit Recognized In Other Comprehensive Income Loss [Line Items]
Newly established gain (loss)		(38)	(30)
Amortization of:
Net actuarial loss		7	5
Total income (loss) recognized in Other comprehensive income		$ (31)	$ (25)

[1] Reclassified to Pension income - refer to Note 20, "Retirement Plans" and Note 21, "Other Postretirement Benefits" for additional information.