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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Millions
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings (Deficit) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2017 $ 1,185 $ 1 $ 2,019 $ (730) $ (105)
Net income 2     2  
Stock-based compensation 4   4    
Other comprehensive income (loss) 1       1
Ending balance at Mar. 31, 2018 1,192 1 2,023 (728) (104)
Beginning balance at Dec. 31, 2017 1,185 1 2,019 (730) (105)
Net income 36        
Ending balance at Sep. 30, 2018 1,217 1 2,030 (694) (120)
Beginning balance at Mar. 31, 2018 1,192 1 2,023 (728) (104)
Net income 14     14  
Stock-based compensation 4   4    
Shares withheld for taxes (1)   (1)    
Other comprehensive income (loss) (20)       (20)
Ending balance at Jun. 30, 2018 1,189 1 2,026 (714) (124)
Net income 20     20  
Stock-based compensation 4   4    
Other comprehensive income (loss) 4       4
Ending balance at Sep. 30, 2018 1,217 1 2,030 (694) (120)
Beginning balance at Dec. 31, 2018 1,214 1 2,034 (678) (143)
Net income 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 1 2,037 (660) (133)
Beginning balance at Dec. 31, 2018 1,214 1 2,034 (678) (143)
Net income 42        
Ending balance at Sep. 30, 2019 1,267 1 2,045 (636) (143)
Beginning balance at Mar. 31, 2019 1,245 1 2,037 (660) (133)
Net income 14     14  
Stock-based compensation 4   4    
Other comprehensive income (loss) 1       1
Ending balance at Jun. 30, 2019 1,264 1 2,041 (646) (132)
Net income 10     10  
Stock-based compensation 4   4    
Other comprehensive income (loss) (11)       (11)
Ending balance at Sep. 30, 2019 $ 1,267 $ 1 $ 2,045 $ (636) $ (143)