Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock Shares	Common Stock Amount	Accumulated Other Comprehensive Loss	Retained Earnings	Noncontrolling Interests' Equity
Balance, shares at Dec. 31, 2013		78,085,559
Balance at Dec. 31, 2013			$ 911	$ (5)	$ 913	$ 1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued pursuant to equity-based plans		142,780
Proceeds from issuance of shares pursuant to equity-based plans			1
Stock-based compensation			6	0	0	0
Dividends declared			0	0	(88)	0
Net income (loss)	$ 174		0	0	175	(1)
Other comprehensive income (loss)			0	(2)	0	0
Balance, shares at Dec. 31, 2014		78,228,339
Balance at Dec. 31, 2014			918	(7)	1,000	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of common stock, net of issuance costs		10,400,000
Issuances of common stock, net of issuance costs			271
Shares issued pursuant to equity-based plans		164,412
Proceeds from issuance of shares pursuant to equity-based plans			1
Stock-based compensation			6	0	0	0
Dividends declared			0	0	(102)	0
Net income (loss)	172		0	0	172	0
Other comprehensive income (loss)			0	(1)	0	0
Balance, shares at Dec. 31, 2015		88,792,751
Balance at Dec. 31, 2015	2,258		1,196	(8)	1,070	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued pursuant to equity-based plans		153,953
Proceeds from issuance of shares pursuant to equity-based plans			1
Stock-based compensation			4	0	0	0
Dividends declared			0	0	(113)	0
Net income (loss)	193		0	0	193	0
Other comprehensive income (loss)			0	1	0	0
Balance, shares at Dec. 31, 2016		88,946,704
Balance at Dec. 31, 2016	$ 2,344		$ 1,201	$ (7)	$ 1,150	$ 0