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Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Statement of Equity Table [Line Items]          
Beginning Balance       114,355,519  
Repurchase of common stock     (1,200,000)    
Ending Balance 115,440,569     115,440,569  
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance $ 1,625 $ 2,253 $ 2,315 $ 2,096 $ 2,315
Net income (loss) 99 (112)   (376) (141)
Other comprehensive income (loss) 1 (1)   1 0
Repurchase of common stock     $ (20)   (20)
Stock-based compensation 9 $ 10   19 25
Issuance of shares for vesting of equity awards 0     0 0
Shares withheld for taxes on equity awards 0     (5) $ (6)
Cash dividends declared per share   $ 0.09     $ 0.27
Dividends declared, APIC   $ (10)   0 $ (31)
Dividends declared (1) (10)   (2) (33)
Ending Balance $ 1,733 $ 2,140   $ 1,733 $ 2,140
Common Stock          
Statement of Equity Table [Line Items]          
Beginning Balance 115,400,000 114,300,000 114,600,000 114,400,000 114,600,000
Repurchase of common stock         (1,200,000)
Issuance of shares for vesting of equity awards 100,000     1,600,000 1,300,000
Shares withheld for taxes on equity awards (100,000)     (600,000) (400,000)
Ending Balance 115,400,000 114,300,000   115,400,000 114,300,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance $ 1 $ 1 $ 1 $ 1 $ 1
Repurchase of common stock         0
Issuance of shares for vesting of equity awards 0     0 0
Shares withheld for taxes on equity awards 0     0 0
Ending Balance 1 1   1 1
Additional Paid-In Capital          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance 4,847 4,837 4,869 4,842 4,869
Repurchase of common stock         (20)
Stock-based compensation 9 10   19 25
Shares withheld for taxes on equity awards 0     (5) (6)
Ending Balance 4,856 4,837   4,856 4,837
Accumulated Deficit          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance (3,171) (2,537) (2,507) (2,695) (2,507)
Net income (loss) 98 (113)   (378) (143)
Ending Balance (3,073) (2,650)   (3,073) (2,650)
Accumulated Other Comprehensive Loss          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance (56) (51) (52) (56) (52)
Other comprehensive income (loss) 1 (1)   1  
Ending Balance (55) (52)   (55) (52)
Non- controlling Interests          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance 4 3 $ 4 4 4
Net income (loss) 1 1   2 2
Dividends declared, Noncontrolling Interest (1) 0   (2) (2)
Ending Balance $ 4 $ 4   $ 4 $ 4