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Earnings (Loss) Per Share - Reconciliation of Numerators and Denominators Used for Computation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator:        
Loss from Continuing Operations, net of tax $ (19) $ (28) $ (46) $ (38)
Loss from Discontinued Operations, net of tax   (20)   (25)
Net loss $ (19) $ (48) $ (46) $ (63)
Denominator:        
Weighted average number of shares outstanding, basic 57.0 58.3 57.8 58.2
Weighted average number of shares outstanding, diluted 57.0 58.3 57.8 58.2
Basic and diluted loss per share from continuing operations $ (0.32) $ (0.48) $ (0.80) $ (0.65)
Basic and diluted loss per share from discontinued operations   (0.34)   (0.43)
Basic and diluted earnings (loss) per share $ (0.32) $ (0.82) $ (0.80) $ (1.08)