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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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Basic earnings per share: [Abstract]        
Net income (loss) $ (35) $ 173 $ 98 $ 549
Less: Undistributed earnings allocated to participating securities 0 5 3 15
Net income (loss) available to common stockholders $ (35) $ 168 $ 95 $ 534
Basic weighted average shares 155,239,723 187,104,785 169,610,370 188,428,870
Net income (loss) per basic common share $ (0.23) $ 0.9 $ 0.56 $ 2.83
Diluted earnings per share: [Abstract]        
Net income (loss) $ (35) $ 173 $ 98 $ 549
Less: Undistributed earnings allocated to participating securities 0 5 3 14
Less: mark-to-market gain (loss) on warrants 0 18 0 32
Net income (loss) available to common stockholders $ (35) $ 150 $ 95 $ 503
Basic weighted average shares 155,239,723 187,104,785 169,610,370 188,428,870
Stock options 0 1,029,777 956,016 1,126,134
Warants 0 289,756 0 2,061,719
Diluted weighted average shares 155,239,723 188,424,318 170,566,386 191,616,723
Net income (loss) per diluted common share $ (0.23) $ 0.8 $ 0.55 $ 2.62
Unvested Restricted Stock And Units That Receive Nonforfeitable Dividends Or Dividend Equivalents That Have Met Service Condition 600,826 270,142 619,889 315,018