Note 12 - Pension and Postretirement Benefit Plans - Amounts Recognized in the Balance Sheet and Amounts Recognized in AOCI (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Amounts recognized in the consolidated balance sheet:
Noncurrent assets	$ 3	$ 4
Noncurrent liabilities	(479)	(459)
UNITED STATES | Pension Plan [Member]
Amounts recognized in the consolidated balance sheet:
Noncurrent assets	2	0
Noncurrent liabilities	(31)	(48)
Net amount recognized	(29)	(48)
Amounts recognized in AOCI:
Net actuarial loss (gain)	142	157
AOCI before tax	142	157
Deferred taxes	16	13
Net	158	170
UNITED STATES | Other Postretirement Benefits Plan [Member]
Amounts recognized in the consolidated balance sheet:
Noncurrent assets	0	0
Noncurrent liabilities	(4)	(3)
Net amount recognized	(4)	(3)
Amounts recognized in AOCI:
Net actuarial loss (gain)	2	1
AOCI before tax	2	1
Net	2	1
Foreign Plan [Member] | Pension Plan [Member]
Amounts recognized in the consolidated balance sheet:
Noncurrent assets	1	4
Current liabilities	(14)	(13)
Noncurrent liabilities	(356)	(325)
Net amount recognized	(369)	(334)
Amounts recognized in AOCI:
Net actuarial loss (gain)	108	108
AOCI before tax	108	108
Deferred taxes	(30)	(28)
Net	78	80
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]
Amounts recognized in the consolidated balance sheet:
Noncurrent assets	0	0
Current liabilities	(5)	(5)
Noncurrent liabilities	(88)	(83)
Net amount recognized	(93)	(88)
Amounts recognized in AOCI:
Net actuarial loss (gain)	(8)	(12)
AOCI before tax	(8)	(12)
Deferred taxes	3	4
Net	$ (5)	$ (8)