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Note 18 - Changes in Other Comprehensive Income (Loss), by Component (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract]
Currency translation adjustments			$ (1)	$ 3	$ (17)
Newly established net actuarial (loss) gain				(1)	6
Newly established net actuarial (loss) gain, net of tax				(1)	6
Amortization of prior service credit	[1]	$ (2)	(2)	(6)	(6)
Amortization of actuarial losses	[1]	9	5	28	15
Recognition of losses due to curtailments and settlements					1
Total reclassification adjustments		7	3	22	10
Tax provision					(1)
Reclassification adjustments, net of tax		7	3	22	9
Pension and other postretirement benefit plan changes, net of tax		7	3	21	15
Other comprehensive income (loss), net of tax		$ 7	$ 2	$ 24	$ (2)
[1] Reclassified to Total Net Periodic Benefit Cost - refer to Note 14, "Retirement Plans and Other Postretirement Benefits".

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