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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, 2018 $ 1,214     $ 2,034 $ (678)   $ (143)
Beginning balance, shares at Dec. 31, 2018     1        
Net income (loss) 18       18    
Stock-based compensation 4     4      
Exercise of stock options 1     1      
Shares withheld for taxes (2)     (2)      
Other comprehensive income (loss) 10           10
Ending balance at Mar. 31, 2019 1,245     2,037 (660)   (133)
Ending balance, shares at Mar. 31, 2019     1        
Beginning balance at Dec. 31, 2018 1,214     2,034 (678)   (143)
Beginning balance, shares at Dec. 31, 2018     1        
Net income (loss) 32            
Ending balance at Jun. 30, 2019 1,264     2,041 (646)   (132)
Ending balance, shares at Jun. 30, 2019     1        
Beginning balance at Mar. 31, 2019 1,245     2,037 (660)   (133)
Beginning balance, shares at Mar. 31, 2019     1        
Net income (loss) 14       14    
Stock-based compensation 4     4      
Other comprehensive income (loss) 1           1
Ending balance at Jun. 30, 2019 1,264     2,041 (646)   (132)
Ending balance, shares at Jun. 30, 2019     1        
Beginning balance at Dec. 31, 2019 1,144 $ (6)   2,046 (775) $ (6) (128)
Beginning balance, shares at Dec. 31, 2019     1        
Net income (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 income (loss) (361)            
Other comprehensive income (loss)             (31)
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 income (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