Note 6 - Stockholders' Equity - Changes in Equity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Balance	$ 1,939	$ 1,720	$ 1,834	$ 1,968
Net income	52	49	181	(65)
Other comprehensive income (loss)	(28)	23	(20)	(82)
Common stock dividends	(15)		(44)	(15)
Distributions to noncontrolling interests	(8)	(2)	(10)	(10)
Redeemable noncontrolling interests adjustment to redemption value	(2)		(10)
Deconsolidation of non-wholly owned subsidiary	(8)		(8)
Common stock share repurchases	(23)		(23)
Stock compensation	5	2	17	5
Purchase of noncontrolling interests		1		(1)
Sale of noncontrolling interests			(1)
Other			1
Stock withheld for employee taxes			(5)	(6)
Balance	1,912	1,793	1,912	1,793
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance				(1)
Common Stock [Member]
Balance	2	2	2	2
Balance	2	2	2	2
Additional Paid-in Capital [Member]
Balance	2,420	2,390	2,408	2,386
Stock compensation	5	2	17	5
Purchase of noncontrolling interests				1
Balance	2,425	2,392	2,425	2,392
Retained Earnings [Member]
Balance	617	490	530	622
Net income	48	45	172	(71)
Common stock dividends	(15)		(44)	(15)
Redeemable noncontrolling interests adjustment to redemption value	(2)		(10)
Balance	648	535	648	535
Retained Earnings [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance				(1)
Treasury Stock [Member]
Balance	(161)	(156)	(156)	(150)
Common stock share repurchases	(23)		(23)
Stock withheld for employee taxes			(5)	(6)
Balance	(184)	(156)	(184)	(156)
AOCI Attributable to Parent [Member]
Balance	(1,007)	(1,082)	(1,026)	(987)
Other comprehensive income (loss)	(28)	12	(9)	(83)
Balance	(1,035)	(1,070)	(1,035)	(1,070)
Noncontrolling Interest [Member]
Balance	68	76	76	95
Net income	4	4	9	6
Other comprehensive income (loss)	0	11	(11)	1
Distributions to noncontrolling interests	(8)	(2)	(10)	(10)
Deconsolidation of non-wholly owned subsidiary	(8)		(8)
Purchase of noncontrolling interests		1		(2)
Sale of noncontrolling interests			(1)
Other			1
Balance	$ 56	$ 90	$ 56	$ 90