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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Basic earnings per share: [Abstract]    
Net income (loss) $ (98) $ (72)
Less: Undistributed earnings allocated to participating securities 0 0
Net income (loss) available to common stockholders $ (98) $ (72)
Basic weighted average shares [1] 88,131,373 131,402,465
Basic $ (1.12) $ (0.55)
Diluted earnings per share: [Abstract]    
Net income (loss) $ (98) $ (72)
Less: Undistributed earnings allocated to participating securities 0 0
Net income (loss) available to common stockholders $ (98) $ (72)
Basic weighted average shares [1] 88,131,373 131,402,465
Stock options 0 0
Warants 0 0
Diluted weighted average shares [1] 88,131,373 131,402,465
Diluted $ (1.12) $ (0.55)
Unvested Restricted Stock And Units That Receive Nonforfeitable Dividends Or Dividend Equivalents That Have Met Service Condition 300,000 300,000
Potentially dilutive securities excluded from the diluted EPS because of antidilutive effect 13,700,000 14,800,000
[1]
Includes 0.3 million of participating securities that met the service condition and were eligible to receive nonforfeitable dividends or dividend equivalents for the three months ended March 31, 2018 and 2017.