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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, 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