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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, 2016
Mar. 31, 2015
Basic earnings per share: [Abstract]    
Net income (loss) $ (78) $ 69
Less: Undistributed earnings allocated to participating securities 0 2
Net income (loss) available to common stockholders $ (78) $ 67
Basic weighted average shares 135,814,835 181,735,876
Basic $ (0.58) $ 0.37
Diluted earnings per share: [Abstract]    
Net income (loss) $ (78) $ 69
Less: Undistributed earnings allocated to participating securities 0 2
Net income (loss) available to common stockholders $ (78) $ 67
Basic weighted average shares 135,814,835 181,735,876
Stock options 0 1,000,539
Warants 0 0
Diluted weighted average shares 135,814,835 182,736,415
Diluted $ (0.58) $ 0.37
Unvested Restricted Stock And Units That Receive Nonforfeitable Dividends Or Dividend Equivalents That Have Met Service Condition 712,927 678,568