Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Millions	Total	Total Stockholders Equity	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Non-Redeemable Noncontrolling Interests in Subsidiaries
Balance at beginning of period (in shares) at Dec. 31, 2018			119,000
Balance at beginning of period at Dec. 31, 2018		$ 399	$ 1	$ 34	$ 606	$ (246)	$ 4
Comprehensive income:
Net income		38			37		1
Other comprehensive income		16				16
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Continuing Operations		54			37	16
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Nonredeemable Noncontrolling Interest							1
Employee stock purchase and stock compensation plans (in shares)			1,000
Employee stock purchase and stock compensation plans		14		14
Series A convertible preferred stock dividends		(13)
Series A convertible preferred stock dividends					(13)
Balance at end of period (in shares) at Mar. 31, 2019			120,000
Balance at end of period at Mar. 31, 2019		454	$ 1	48	630	(230)	5
Balance at beginning of period (in shares) at Dec. 31, 2018			119,000
Balance at beginning of period at Dec. 31, 2018		399	$ 1	34	606	(246)	4
Comprehensive income:
Other comprehensive income	$ (16)
Balance at end of period (in shares) at Sep. 30, 2019			127,000
Balance at end of period at Sep. 30, 2019		731	$ 1	269	717	(261)	5
Balance at beginning of period (in shares) at Mar. 31, 2019			120,000
Balance at beginning of period at Mar. 31, 2019		454	$ 1	48	630	(230)	5
Comprehensive income:
Net income		88			88
Other comprehensive income		(11)				(11)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Continuing Operations		77			88	(11)
Employee stock purchase and stock compensation plans		28		28
Series A convertible preferred stock dividends		(12)			(12)
Balance at end of period (in shares) at Jun. 30, 2019			120,000
Balance at end of period at Jun. 30, 2019		547	$ 1	76	706	(241)	5
Comprehensive income:
Net income		91			90		1
Other comprehensive income	$ (21)	(20)				(20)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Continuing Operations		71			90	(20)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Nonredeemable Noncontrolling Interest							1
Employee stock purchase and stock compensation plans (in shares)			1,000
Employee stock purchase and stock compensation plans		17		17
Series A convertible preferred stock dividends		(12)			(12)
Redemption of Preferred Shares		(205)		(272)	(67)
Stock Issued During Period, Shares, Conversion of Convertible Securities			9,000
Repurchase of Company common stock (in shares)			(3,000)
Repurchase of Company common stock		(96)		(96)
Dividends paid to minority shareholders		(1)					(1)
Balance at end of period (in shares) at Sep. 30, 2019			127,000
Balance at end of period at Sep. 30, 2019		731	$ 1	269	717	(261)	5
Balance at beginning of period (in shares) at Dec. 31, 2019	127,700		127,000
Balance at beginning of period at Dec. 31, 2019	$ 1,107	1,107	$ 1	312	1,060	(269)	3
Comprehensive income:
Net income		24			23		1
Other comprehensive income		(61)				(60)	(1)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Continuing Operations		(37)			23	(60)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Nonredeemable Noncontrolling Interest							0
Employee stock purchase and stock compensation plans (in shares)			2,000
Employee stock purchase and stock compensation plans		4		4
Series A convertible preferred stock dividends		(6)			(6)
Repurchase of Company common stock (in shares)			(2,000)
Repurchase of Company common stock		(41)		(41)
Balance at end of period (in shares) at Mar. 31, 2020			127,000
Balance at end of period at Mar. 31, 2020		1,027	$ 1	275	1,077	(329)	3
Balance at beginning of period (in shares) at Dec. 31, 2019	127,700		127,000
Balance at beginning of period at Dec. 31, 2019	$ 1,107	1,107	$ 1	312	1,060	(269)	3
Comprehensive income:
Other comprehensive income	$ (28)
Balance at end of period (in shares) at Sep. 30, 2020	128,500		129,000
Balance at end of period at Sep. 30, 2020	$ 1,199	1,199	$ 1	332	1,159	(297)	4
Balance at beginning of period (in shares) at Mar. 31, 2020			127,000
Balance at beginning of period at Mar. 31, 2020		1,027	$ 1	275	1,077	(329)	3
Comprehensive income:
Net income		64			64
Other comprehensive income		14				14
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Continuing Operations		78			64	14
Employee stock purchase and stock compensation plans (in shares)			1,000
Employee stock purchase and stock compensation plans		25		25
Series A convertible preferred stock dividends		(7)			(7)
Balance at end of period (in shares) at Jun. 30, 2020			128,000
Balance at end of period at Jun. 30, 2020		1,123	$ 1	300	1,134	(315)	3
Comprehensive income:
Net income		32			31		1
Other comprehensive income	$ 19	19				18	1
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Continuing Operations		51			31	18
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Nonredeemable Noncontrolling Interest							2
Employee stock purchase and stock compensation plans (in shares)			1,000
Employee stock purchase and stock compensation plans		32		32
Series A convertible preferred stock dividends		(6)			(6)
Dividends paid to minority shareholders		(1)					(1)
Balance at end of period (in shares) at Sep. 30, 2020	128,500		129,000
Balance at end of period at Sep. 30, 2020	$ 1,199	$ 1,199	$ 1	$ 332	$ 1,159	$ (297)	$ 4