Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

Computation of basic and diluted earnings per common share

The computation of basic and diluted earnings per common share for the years ended December 31 is presented in the following table.

($ in millions, except per share data)	2016		2015		2014
Numerator:
Net income	$	1,877	$	2,171	$	2,850
Less: Preferred stock dividends	116		116		104
Net income applicable to common shareholders(1)	$	1,761	$	2,055	$	2,746
Denominator:
Weighted average common shares outstanding	372.8		401.1		431.4
Effect of dilutive potential common shares:
Stock options	3.2		4.0		4.7
Restricted stock units (non-participating) and performance stock awards	1.3		1.7		2.1
Weighted average common and dilutive potential common shares outstanding	377.3		406.8		438.2
Earnings per common share – Basic	$	4.72	$	5.12	$	6.37
Earnings per common share – Diluted	$	4.67	$	5.05	$	6.27

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