Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions		Total	Common Stock [member]	Additional Paid-in Capital [member]	Retained Earnings [member]	Accumulated Other Comprehensive Loss [member]	Non-Controlling Interests [member]
Balance at Dec. 31, 2017		$ 5,962	$ 2	$ 3,825	$ 2,229	$ (45)	$ (49)
Balance (shares) at Dec. 31, 2017			215,000,000
Share-based compensation, net		3		3
Net income (loss)		149			150		(1)
Other comprehensive income		37				37
Dividends and dividend equivalents	[1]	(88)			(88)
Repurchase of common stock		(348)		(250)	(98)
Repurchases of common stock (Shares)			(14,000,000)
Balance at Mar. 31, 2018		5,715	$ 2	3,578	2,193	(8)	(50)
Balance (shares) at Mar. 31, 2018			201,000,000
Balance at Dec. 31, 2018		$ 5,586	$ 2	3,589	2,047	(6)	(46)
Balance (shares) at Dec. 31, 2018		201,198,381	201,000,000
Share-based compensation, net		$ (1)		(1)
Net income (loss)		97			96		1
Dividends and dividend equivalents	[1]	(91)			(91)
Distributions to noncontrolling interests		(3)					(3)
Cumulative effect of change in accounting principle		(8)			(8)
Balance at Mar. 31, 2019		$ 5,580	$ 2	$ 3,588	$ 2,044	$ (6)	$ (48)
Balance (shares) at Mar. 31, 2019		201,539,398	201,000,000

[1] Dividends declared per common share were $0.45 and $0.43 for the three months ended March 31, 2019 and 2018.