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Equity (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Equity Table [Line Items]    
Beginning Balance 115,457,067  
Ending Balance 116,411,025  
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance $ 1,767 $ 2,096
Net income (loss) 34 (462)
Other comprehensive income (loss) 0 (1)
Stock-based compensation 6 6
Issuance of shares for vesting of equity awards 0 0
Shares withheld for taxes on equity awards (8) (4)
Dividends declared, APIC 0 0
Dividends declared (2) (1)
Ending Balance $ 1,797 $ 1,634
Common Stock    
Statement of Equity Table [Line Items]    
Beginning Balance 115,500,000 114,400,000
Issuance of shares for vesting of equity awards 1,400,000 1,400,000
Shares withheld for taxes on equity awards (500,000) (500,000)
Ending Balance 116,400,000 115,300,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance $ 1 $ 1
Issuance of shares for vesting of equity awards 0 0
Shares withheld for taxes on equity awards 0 0
Ending Balance 1 1
Additional Paid-In Capital    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance 4,876 4,842
Stock-based compensation 6 6
Shares withheld for taxes on equity awards (8) (4)
Ending Balance 4,874 4,844
Accumulated Deficit    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance (3,055) (2,695)
Net income (loss) 33 (462)
Ending Balance (3,022) (3,157)
Accumulated Other Comprehensive Loss    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance (59) (56)
Other comprehensive income (loss)   (1)
Ending Balance (59) (57)
Non- controlling Interests    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance 4 4
Net income (loss) 1 0
Dividends declared, Noncontrolling Interest (2) (1)
Ending Balance $ 3 $ 3