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Equity Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 40 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jan. 01, 2018
Statement of Equity Table [Line Items]              
Beginning Balance   114,620,499   114,620,499      
Repurchase of common stock   (1,200,000)       (35,500,000)  
Ending Balance 114,303,786     114,303,786   114,303,786  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance $ 2,189 $ 2,315 $ 2,428 $ 2,315 $ 2,622    
Cumulative effect of adoption of new accounting pronouncements             $ (22)
Net income (loss) 70   124 (29) 57    
Other comprehensive income (loss) (1)   (3) 1 (1)    
Repurchase of common stock   (20) (106) (20) (200) $ (896)  
Stock-based compensation 7   12 15 21    
Shares withheld for taxes on equity awards     (1) (6) (10)    
Dividends declared, APIC (11)   (11) (21) (23)    
Dividends declared (12)   (12) (23) (25)    
Ending Balance $ 2,253 $ 2,189 $ 2,442 $ 2,253 $ 2,442 $ 2,253  
Common Stock              
Statement of Equity Table [Line Items]              
Beginning Balance 114,200,000 114,600,000 128.8 114,600,000 131.6    
Repurchase of common stock     (4.3) (1,200,000) (7.8)    
Issuance of shares for vesting of equity awards 100,000   0.2 1,300,000 1.2    
Shares withheld for taxes on equity awards     (0.1) (400,000) (0.4)    
Ending Balance 114,300,000 114,200,000 124.6 114,300,000 124.6 114,300,000  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance $ 1 $ 1 $ 1 $ 1 $ 1    
Repurchase of common stock     0 0 0    
Issuance of shares for vesting of equity awards 0   0 0 0    
Shares withheld for taxes on equity awards     0 0 0    
Ending Balance 1 1 1 1 1 $ 1  
Additional Paid-In Capital              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance 4,841 4,869 5,179 4,869 5,285    
Repurchase of common stock     (106) (20) (200)    
Stock-based compensation 7   12 15 21    
Shares withheld for taxes on equity awards     (1) (6) (10)    
Ending Balance 4,837 4,841 5,073 4,837 5,073 4,837  
Accumulated Deficit              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance (2,606) (2,507) (2,711) (2,507) (2,631)    
Cumulative effect of adoption of new accounting pronouncements             (13)
Net income (loss) 69   123 (30) 56    
Ending Balance (2,537) (2,606) (2,588) (2,537) (2,588) (2,537)  
Accumulated Other Comprehensive Loss              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance (50) (52) (44) (52) (37)    
Cumulative effect of adoption of new accounting pronouncements             $ (9)
Other comprehensive income (loss) (1)   (3) 1 (1)    
Ending Balance (51) (50) (47) (51) (47) (51)  
Non- controlling Interests              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance 3 4 3 4 4    
Net income (loss) 1   1 1 1    
Dividends declared, Noncontrolling Interest (1)   (1) (2) (2)    
Ending Balance $ 3 $ 3 $ 3 $ 3 $ 3 $ 3