Stock Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2017

The following table represents the stock option activity for 2017.

Table 79: Stock Options - Rollforward (a)



Year ended December 31, 2017 In millions except weighted-average data	Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life	Aggregate Intrinsic Value
Outstanding, January 1	3		$	55.16
Exercised	(2	)	$	53.22
Outstanding, December 31	1		$	58.02	2.6 years	$	112
Vested and exercisable, December 31	1		$	58.02	2.6 years	$	112


(a)	Cancelled stock options during 2017 were insignificant.

Table 80: Nonvested Incentive/Performance Unit Awards and Restricted Share/Restricted Share Unit Awards Rollforward (a)



Shares in millions	Nonvested Incentive/ Performance Units Shares		Weighted- Average Grant Date Fair Value		Nonvested Restricted Share/ Restricted Share Units		Weighted- Average Grant Date Fair Value
December 31, 2016	2		$	81.42	3		$	83.27
Granted (b)	1		$	122.13	1		$	122.09
Vested/Released (b)	(1	)	$	78.69	(1	)	$	80.69
December 31, 2017	2		$	94.29	3		$	95.64


(a)	Forfeited awards during 2017 were insignificant.


(b)	Includes adjustments for achieving specific performance goals for Incentive/

Performance Unit Share Awards granted in prior periods.