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Consolidated Statements of Equity - USD ($)
$ in Millions
Total
Common Stock Shares
Common Stock Amount
Accumulated Other Comprehensive Loss
Retained Earnings
Balance, shares at Dec. 31, 2014   78,228,339      
Balance at Dec. 31, 2014 $ 1,911   $ 918 $ (7) $ 1,000
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   271    
Shares issued pursuant to equity-based plans   164,412      
Proceeds from issuance of shares pursuant to equity-based plans 1   1    
Stock-based compensation 6   6 0 0
Dividends declared (102)   0 0 (102)
Net income (loss) 172   0 0 172
Other comprehensive income (loss) (1)   0 (1) 0
Balance, shares at Dec. 31, 2015   88,792,751      
Balance at Dec. 31, 2015 2,258   1,196 (8) 1,070
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   1    
Stock-based compensation 4   4 0 0
Dividends declared (113)   0 0 (113)
Net income (loss) 193   0 0 193
Other comprehensive income (loss) 1   0 1 0
Balance, shares at Dec. 31, 2016   88,946,704      
Balance at Dec. 31, 2016 2,344   1,201 (7) 1,150
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Shares issued pursuant to equity-based plans   167,561      
Proceeds from issuance of shares pursuant to equity-based plans 2   2    
Stock-based compensation 4   4 0 0
Dividends declared (120)   0 0 (120)
Net income (loss) 187   0 0 187
Other comprehensive income (loss) (1)   0 (1) 0
Balance, shares at Dec. 31, 2017   89,114,265      
Balance at Dec. 31, 2017 $ 2,416   $ 1,207 $ (8) $ 1,217