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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2013
Text Block [Abstract]  
Schedule Of Basic And Diluted Earnings Per Share
              
   Three Months Ended June 30, Six Months Ended June 30,
$ in millions except share and per share amounts 2013 2012 2013  2012
Net income (loss) $(178) $581 $(14) $591
Basic weighted average shares (1)  193,104,610  193,926,953  193,810,351  193,700,328
Effect of common stock equivalents:            
 Stock options and warrants  0  1,014,280  0  1,063,289
Diluted weighted average shares  193,104,610  194,941,233  193,810,351  194,763,617
Net income (loss) per common share:            
 Basic $(0.92) $2.99 $(0.07) $3.05
 Diluted $(0.92) $2.98 $(0.07) $3.03
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(1) - Includes 4,490,348 and 5,597,797 of unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents for the three months ended June 30,
 2013 and 2012, respectively. Includes 5,303,456 and 5,400,564 of unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents for the
 six months ended June 30, 2013 and 2012, respectively.