Share-Based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Amounts of Share-Based Compensation Cost Recorded in Consolidated Statement of Income

The following table provides the amounts of share-based compensation cost recorded in the Condensed Consolidated Statement of Income:



	Three Months Ended March 31,
($ in millions)	2017			2016
Pretax share-based compensation expense	$	74		$	68
Income tax benefit	(22		)	(20		)
Total share-based compensation expense, net of taxes	$	52		$	48

Assumptions Used to Determine Weighted-Average Fair Value of Options Granted

The weighted-average fair value of options granted for the first three months of 2017 and 2016 was $7.89 and $5.76 per option, respectively, and was determined using the following assumptions:



	Three Months Ended March 31,
	2017		2016
Expected dividend yield	3.7	%	3.8	%
Risk-free interest rate	2.0	%	1.3	%
Expected volatility	19.7	%	21.0	%
Expected life (years)	6.2		6.2