Consolidated Statement Of Stockholders' Equity - USD ($) $ in Millions	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive (Loss) [Member]	Parent [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2015	$ 831	$ 0	$ 2	$ 2,311	$ (410)	$ (1)	$ (1,174)	$ 728	$ 103
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the parent company	640				640
Net income attributable to nonredeemable noncontrolling interests	13
Net income, including portion attributable to nonredeemable noncontrolling interests	653
Other comprehensive income (loss), net of tax	(112)						(110)	(110)	(2)
Other comprehensive income (loss), including portion attributable to nonredeemable noncontrolling interests	(112)
Common stock dividends	(35)				(35)			(35)
Distributions to noncontrolling interests	(17)								(17)
Derecognition of noncontrolling interest	(12)								(12)
Common stock share repurchases	(81)					(81)		(81)
Stock compensation	16			16				16
Stock withheld for employees taxes	(1)					(1)		(1)
Ending Balance at Dec. 31, 2016	1,242	0	2	2,327	195	(83)	(1,284)	1,157	85
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standard, January 1 | Accounting Standards Update 2016-16 [Member]	(179)				(179)			(179)
Net income attributable to the parent company	111				111
Net income attributable to nonredeemable noncontrolling interests	10
Net income, including portion attributable to nonredeemable noncontrolling interests	121
Other comprehensive income (loss), net of tax	(48)						(58)	(58)	7
Other comprehensive income (loss), including portion attributable to nonredeemable noncontrolling interests	(51)
Common stock dividends	(35)				(35)			(35)
Distributions to noncontrolling interests	(12)								(12)
Increase from business combination	12								12
Redeemable noncontrolling interests adjustment to redemption value	(6)				(6)			(6)
Purchase of noncontrolling interests	(1)								(1)
Stock compensation	27			27				27
Stock withheld for employees taxes	(4)					(4)		(4)
Ending Balance at Dec. 31, 2017	1,114	0	2	2,354	86	(87)	(1,342)	1,013	101
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standard, January 1 | Accounting Standards Update 2016-01 [Member]	0				2		(2)	0
Net income attributable to the parent company	427				427
Net income attributable to nonredeemable noncontrolling interests	13
Net income, including portion attributable to nonredeemable noncontrolling interests	440
Other comprehensive income (loss), net of tax	(30)						(18)	(18)	(6)
Other comprehensive income (loss), including portion attributable to nonredeemable noncontrolling interests	(24)
Common stock dividends				1
Common stock dividends	(58)				(59)			(58)
Distributions to noncontrolling interests	(42)								(42)
Purchase of noncontrolling interests	0
Purchase of noncontrolling interests				(9)				(9)
Purchase of noncontrolling interests									9
Purchase of redeemable noncontrolling interests	2			2				2
Contributions from noncontrolling interest	22								22
Common stock share repurchases	(25)					(25)		(25)
Stock compensation	20			20				20
Stock withheld for employees taxes	(7)					(7)		(7)
Ending Balance at Dec. 31, 2018	$ 1,442	$ 0	$ 2	$ 2,368	$ 456	$ (119)	$ (1,362)	$ 1,345	$ 97