Note 6 - Stockholders' Equity - Changes in Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Balance	$ 1,968	$ 1,442
Net income	40	102
Other comprehensive income (loss)	(130)	32
Common stock dividends	(15)	(15)
Distributions to noncontrolling interests	(1)	(1)
Stock compensation	5	4
Stock withheld for employee taxes	(6)	(6)
Balance	1,860	1,539
Increase from business combination		7
Common stock share repurchases		(25)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance	(1)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-02 [Member]
Balance		(1)
Common Stock [Member]
Balance	2	2
Balance	2	2
Additional Paid-in Capital [Member]
Balance	2,386	2,368
Stock compensation	5	4
Balance	2,391	2,372
Retained Earnings [Member]
Balance	622	456
Net income	38	98
Common stock dividends	(15)	(15)
Balance	644	538
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance	(1)
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-02 [Member]
Balance		(1)
Treasury Stock [Member]
Balance	(150)	(119)
Stock withheld for employee taxes	(6)	(6)
Balance	(156)	(150)
Common stock share repurchases		(25)
AOCI Attributable to Parent [Member]
Balance	(987)	(1,362)
Other comprehensive income (loss)	(111)	34
Balance	(1,098)	(1,328)
Noncontrolling Interest [Member]
Balance	95	97
Net income	2	4
Other comprehensive income (loss)	(19)	(2)
Distributions to noncontrolling interests	(1)	(1)
Balance	$ 77	105
Increase from business combination		$ 7