Earnings per Common Share (Tables)

6 Months Ended

Jun. 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 June 30,				Six months ended June 30,
	2015		2014		2015		2014
Numerator:
Net income	$	355	$	645	$	1,032	$	1,245
Less: Preferred stock dividends	29		31		58		44
Net income available to common shareholders	$	326	$	614	$	974	$	1,201
Denominator:
Weighted average common shares outstanding	407.0		434.3		411.4		440.4
Effect of dilutive potential common shares:
Stock options	4.2		4.8		4.5		4.6
Restricted stock units (non-participating) and performance stock awards	1.4		1.6		1.7		1.8
Weighted average common and dilutive potential common shares outstanding	412.6		440.7		417.6		446.8
Earnings per common share - Basic	$	0.80	$	1.41	$	2.37	$	2.73
Earnings per common share - Diluted	$	0.79	$	1.39	$	2.33	$	2.69