Note 18 - Changes in Other Comprehensive Income (Loss), by Component (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract]
Currency translation adjustments		$ 4	$ (4)	$ 3	$ (16)
Newly established net actuarial (loss) gain			5	(1)	6
Newly established net actuarial (loss) gain, net of tax			5	(1)	6
Amortization of prior service credit	[1]	(2)	(2)	(4)	(4)
Amortization of actuarial losses	[1]	10	5	19	10
Recognition of losses (gains) due to curtailments and settlements			1		1
Total reclassification adjustments		8	4	15	7
Tax provision					(1)
Reclassification adjustments, net of tax		8	4	15	6
Pension and other postretirement benefit plan changes, net of tax		8	9	14	12
Other comprehensive income (loss), net of tax		$ 12	$ 5	$ 17	$ (4)

[1] Reclassified to Total Net Periodic Benefit Cost - refer to Note 14, "Retirement Plans and Other Postretirement Benefits".