Earnings per Common Share (Tables)

3 Months Ended

Mar. 31, 2019

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,
	2019		2018
Numerator:
Net income	$	1,292	$	1,006
Less: Preferred stock dividends	31		29
Net income applicable to common shareholders	$	1,261	$	977
Denominator:
Weighted average common shares outstanding	332.6		354.1
Effect of dilutive potential common shares:
Stock options	3.1		4.1
Restricted stock units (non-participating) and performance stock awards	1.8		1.7
Weighted average common and dilutive potential common shares outstanding	337.5		359.9
Earnings per common share - Basic	$	3.79	$	2.76
Earnings per common share - Diluted	$	3.74	$	2.71