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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net loss for basic and diluted EPS $ (107) $ (51)
Basic and diluted weighted average shares outstanding (a) 85.7 96.3
Basic $ (1.25) $ (0.53)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Document Fiscal Year Focus 2017  
Net Income (Loss) Available to Common Stockholders, Diluted $ (107) $ (51)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0.8 0.8
Restricted Stock Units (RSUs) [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 2.6 2.4