Basic earnings per share excludes dilution and is computed by dividing income available to common shareholders by the weighted average number of common shares outstanding during the period. Diluted earnings per share reflect the dilutive effect of all stock options and other items outstanding during the period that could potentially result in the issuance of common stock. For the three months ended June 30, 2011 and 2010, there were 3,803,310 and 5,589,498, respectively, of stock options outstanding that were not included in the diluted earnings per share calculation because they were antidilutive. For the six months ended June 30, 2011 and 2010, there were 3,815,395 and 5,483,258, respectively, of stock options outstanding that were not included in the diluted earnings per share calculation because they were antidilutive.

The following table presents the computation of basic and diluted earnings per share for the three and six months ended June 30, 2011 and 2010:


	Three Months Ended June 30,				Six Months Ended June 30,
$ in millions except share and per share amounts	2011		2010		2011		2010
Net income (loss)	$	137	$	1,295	$	(1,138)	$	(185)
Basic weighted average shares⁽¹⁾		199,295,797		204,377,833		199,602,865		204,639,226
Effect of common stock equivalents:
Stock options		768,882		543,840		-		-

Diluted weighted average shares		200,064,679		204,921,673		199,602,865		204,639,226

Net income (loss) per common share:
Basic	$	0.69	$	6.34	$	(5.70)	$	(0.90)

Diluted	$	0.68	$	6.32	$	(5.70)	$	(0.90)

(1) - Includes 5,035,256 and 5,463,932 of unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents for the three months ended June 30, 2011 and 2010, respectively. Includes 5,102,013 and 5,424,146 of unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents for the six months ended June 30, 2011 and 2010, respectively.