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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Basic earnings per share: [Abstract]    
Net income (loss) $ 256 $ 164
Less: Undistributed earnings allocated to participating securities 5 5
Net income (loss) available to common stockholders 251 159
Basic weighted average shares 189,033,982 [1] 189,111,170 [1]
Net income (loss) per basic common share $ 1.33 $ 0.84
Diluted earnings per share: [Abstract]    
Net income (loss) 256 164
Less: Undistributed earnings allocated to participating securities 5 5
Less: mark-to-market gain (loss) on warrants 0 0
Net income (loss) available to common stockholders $ 251 $ 159
Basic weighted average shares 189,033,982 [1] 189,111,170 [1]
Stock options 1,229,766 1,108,027
Warants 0 0
Diluted weighted average shares 190,263,748 190,219,197
Net income (loss) per diluted common share $ 1.32 $ 0.84
Unvested Restricted Stock And Units That Receive Nonforfeitable Dividends Or Dividend Equivalents That Have Met Service Condition 405,961 712,836
[1] Includes 405,961 and 712,836 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, 2014 and 2013, respectively.