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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Millions, $ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings (Deficit) [Member]
Retained Earnings (Deficit) [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2019 $ 1,144 $ (6)   $ 2,046 $ (775) $ (6) $ (128)
Beginning balance, shares at Dec. 31, 2019     1        
Net loss (331)       (331)    
Other comprehensive income (loss) (39)           (39)
Ending balance at Mar. 31, 2020 768     2,046 (1,112)   (167)
Ending balance, shares at Mar. 31, 2020     1        
Beginning balance at Dec. 31, 2019 1,144 $ (6)   2,046 (775) $ (6) (128)
Beginning balance, shares at Dec. 31, 2019     1        
Net loss (361)            
Ending balance at Jun. 30, 2020 747     2,047 (1,142)   (159)
Ending balance, shares at Jun. 30, 2020     1        
Beginning balance at Mar. 31, 2020 768     2,046 (1,112)   (167)
Beginning balance, shares at Mar. 31, 2020     1        
Net loss (30)       (30)    
Stock-based compensation 1     1      
Other comprehensive income (loss) 8           8
Ending balance at Jun. 30, 2020 747     2,047 (1,142)   (159)
Ending balance, shares at Jun. 30, 2020     1        
Beginning balance at Dec. 31, 2020 699     2,051 (1,208)   (145)
Beginning balance, shares at Dec. 31, 2020     1        
Net loss (10)       (10)    
Stock-based compensation 2     2      
Exercise of stock options 1     1      
Shares withheld for taxes (1)     (1)      
Other comprehensive income (loss) 1           1
Ending balance at Mar. 31, 2021 692     2,053 (1,218)   (144)
Ending balance, shares at Mar. 31, 2021     1        
Beginning balance at Dec. 31, 2020 699     2,051 (1,208)   (145)
Beginning balance, shares at Dec. 31, 2020     1        
Net loss (12)            
Other comprehensive income (loss)             3
Ending balance at Jun. 30, 2021 696     2,057 (1,220)   (142)
Ending balance, shares at Jun. 30, 2021     1        
Beginning balance at Mar. 31, 2021 692     2,053 (1,218)   (144)
Beginning balance, shares at Mar. 31, 2021     1        
Net loss (2)       (2)    
Stock-based compensation 2     2      
Exercise of stock options 2     2      
Other comprehensive income (loss) 2           2
Ending balance at Jun. 30, 2021 $ 696     $ 2,057 $ (1,220)   $ (142)
Ending balance, shares at Jun. 30, 2021     1