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Equity Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 37 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Jan. 01, 2018
Statement of Equity Table [Line Items]        
Beginning Balance 114,620,499      
Repurchase of common stock (1,200,000)   (35,500,000)  
Ending Balance 114,205,678   114,205,678  
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance $ 2,315 $ 2,622    
Cumulative effect of adoption of new accounting pronouncements       $ (22)
Net loss (99) (67)    
Other comprehensive income 2 2    
Repurchase of common stock (20) (94) $ (896)  
Stock-based compensation 8 9    
Shares withheld for taxes on equity awards (6) (9)    
Dividends declared, APIC (10) (12)    
Dividends declared ($0.09 per share) (11) (13)    
Ending Balance $ 2,189 $ 2,428 $ 2,189  
Common Stock        
Statement of Equity Table [Line Items]        
Beginning Balance 114,600,000 131.6    
Repurchase of common stock (1,200,000) (3.5)    
Issuance of shares for vesting of equity awards 1,200,000 1.0    
Shares withheld for taxes on equity awards (400,000) (0.3)    
Ending Balance 114,200,000 128.8 114,200,000  
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance $ 1 $ 1    
Repurchase of common stock 0 0    
Issuance of shares for vesting of equity awards 0 0    
Shares withheld for taxes on equity awards 0 0    
Ending Balance 1 1 $ 1  
Additional Paid-In Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 4,869 5,285    
Repurchase of common stock (20) (94)    
Stock-based compensation 8 9    
Shares withheld for taxes on equity awards (6) (9)    
Ending Balance 4,841 5,179 4,841  
Accumulated Deficit        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (2,507) (2,631)    
Cumulative effect of adoption of new accounting pronouncements       (13)
Net loss (99) (67)    
Ending Balance (2,606) (2,711) (2,606)  
Accumulated Other Comprehensive Loss        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (52) (37)    
Cumulative effect of adoption of new accounting pronouncements       $ (9)
Other comprehensive income 2 2    
Ending Balance (50) (44) (50)  
Non- controlling Interests        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 4 4    
Net loss 0 0    
Dividends declared, Noncontrolling Interest (1) (1)    
Ending Balance $ 3 $ 3 $ 3