Earnings Per Share of Common Stock (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share of Common Stock

Computation of Earnings per share

($ in millions except per share amounts)

For the year ended December 31:	2012			2011		2010
Weighted-average number of shares on which earnings per share calculations are based
Basic	1,142,508,521			1,196,951,006		1,268,789,202
Add—incremental shares under stock-based compensation plans	10,868,426			14,241,131		16,189,053
Add—incremental shares associated with contingently issuable shares	2,072,370			2,575,848		2,377,133
Assuming dilution	1,155,449,317			1,213,767,985		1,287,355,388
Net income on which basic earnings per share is calculated	$	16,604		$	15,855	$	14,833
Less—net income applicable to contingently issuable shares	(1		)	0		0
Net income on which diluted earnings per share is calculated	$	16,603		$	15,855	$	14,833
Earnings/(loss) per share of common stock
Assuming dilution	$	14.37		$	13.06	$	11.52
Basic	$	14.53		$	13.25	$	11.69