Earnings per Common Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Computation of basic and diluted earnings per common share

Computation of basic and diluted earnings per common share
($ in millions, except per share data)	Three months ended March 31,
	2018		2017
Numerator:
Net income	$	975	$	695
Less: Preferred stock dividends	29		29
Net income applicable to common shareholders (1)	$	946	$	666
Denominator:
Weighted average common shares outstanding	354.1		365.7
Effect of dilutive potential common shares:
Stock options	4.1		4.2
Restricted stock units (non-participating) and performance stock awards	1.7		1.4
Weighted average common and dilutive potential common shares outstanding	359.9		371.3
Earnings per common share - Basic	$	2.67	$	1.82
Earnings per common share - Diluted	$	2.63	$	1.79

⁽¹⁾  Net income applicable to common shareholders is net income less preferred stock dividends.