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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2013
Text Block [Abstract]  
Schedule Of Basic And Diluted Earnings Per Share
              
   Three Months Ended September 30, Nine Months Ended September 30,
$ in millions except share and per share amounts 2013 2012 2013  2012
Net income (loss) $132 $7 $118 $598
Basic weighted average shares (1)  192,711,608  193,879,994  193,440,078  193,760,654
Effect of common stock equivalents:            
 Stock options and warrants  4,035,163  1,097,648  4,322,410  1,074,883
Diluted weighted average shares  196,746,771  194,977,642  197,762,488  194,835,537
Net income (loss) per common share:            
 Basic $0.68 $0.04 $0.61 $3.09
 Diluted $0.67 $0.04 $0.60 $3.07
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(1) - Includes 4,349,481 and 5,524,396 of unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents for the three months ended September 30,
 2013 and 2012, respectively. Includes 4,981,970 and 5,442,143 of unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents for the
 nine months ended September 30, 2013 and 2012, respectively.