Note 6 - Stockholders' Equity - Changes in Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Balance	$ 1,834	$ 1,968
Net income	72	60
Other comprehensive income	(20)	(130)
Common stock dividends	(14)	(15)
Redeemable noncontrolling interests adjustment to redemption value	(4)
Stock compensation	7	5
Stock withheld for employee taxes	(5)	(6)
Distributions to noncontrolling interests		(1)
Balance	1,870	1,880
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance		(1)
Common Stock [Member]
Balance	2	2
Balance	2	2
Additional Paid-in Capital [Member]
Balance	2,408	2,386
Stock compensation	7	5
Balance	2,415	2,391
Retained Earnings [Member]
Balance	530	622
Net income	71	58
Common stock dividends	(14)	(15)
Redeemable noncontrolling interests adjustment to redemption value	(4)
Balance	583	664
Treasury Stock [Member]
Balance	(156)	(150)
Stock withheld for employee taxes	(5)	(6)
Balance	(161)	(156)
AOCI Attributable to Parent [Member]
Balance	(1,026)	(987)
Other comprehensive income	(18)	(111)
Balance	(1,044)	(1,098)
Noncontrolling Interest [Member]
Balance	76	95
Net income	1	2
Other comprehensive income	(2)	(19)
Distributions to noncontrolling interests		(1)
Balance	$ 75	$ 77