Earnings per Common Share (Tables)

9 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Computation of basic and diluted earnings per common share

The computation of basic and diluted earnings per common share is presented in the following table.

($ in millions, except per share data)	Three months ended September 30,				Nine months ended September 30,
	2015		2014		2015		2014
Numerator:
Net income	$	650	$	781	$	1,682	$	2,026
Less: Preferred stock dividends	29		31		87		75
Net income available to common shareholders	$	621	$	750	$	1,595	$	1,951
Denominator:
Weighted average common shares outstanding	397.0		424.5		406.5		435.0
Effect of dilutive potential common shares:
Stock options	3.6		4.8		4.2		4.7
Restricted stock units (non-participating) and performance stock awards	1.5		1.9		1.7		1.9
Weighted average common and dilutive potential common shares outstanding	402.1		431.2		412.4		441.6
Earnings per common share - Basic	$	1.56	$	1.77	$	3.92	$	4.49
Earnings per common share - Diluted	$	1.54	$	1.74	$	3.87	$	4.42