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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
The following table provides additional information related to our cash and stock-based compensation awards.
In millions
 
2015
 
2014
 
2013
Compensation costs (1)
 
$
40

 
$
24

 
$
22

Income tax benefits (1)
 
1

 
1

 
1

Excess tax benefits (2)
 
—

 
—

 
—

(1)
Recorded in our Consolidated Statements of Income.
(2)
Recorded in our Consolidated Balance Sheets.
Schedule of Share-based Compensation, Stock Options, Activity
As used in the table, intrinsic value for options means the difference between the current market value and the grant price. 
Stock Options
 
Number of options
 
Weighted average exercise price
 
Weighted average remaining life
(in years)
 
Aggregate intrinsic value
(in millions)
Outstanding
December 31, 2012
 
1,528,590

 
$
36.09

 
 
 
 
Exercised
 
 
(617,358
)
 
35.37

 
 
 
 
Forfeited
 
 
(12,500
)
 
38.36

 
 
 
 
Outstanding (1)
December 31, 2013
 
898,732

 
$
36.55

 
 
 
 
Exercised
 
 
(267,182
)
 
36.84

 
 
 
 
Forfeited
 
 
(4,000
)
 
39.71

 
 
 
 
Outstanding (1)
December 31, 2014
 
627,550

 
$
36.41

 
2.2
 
$
11

Exercised
 
 
(523,400
)
 
36.00

 
1.1
 
 
Outstanding (1) (2)
December 31, 2015
 
104,150

 
$
38.46

 
1.3
 
$
3

(1)
All options outstanding at December 31, 2015, 2014 and 2013 were exercisable.
(2)
The range of exercise prices for the options outstanding at December 31, 2015 was $31.09 to $43.54.
Schedule of Nonvested Performance-based Units Activity
The recorded liability and maximum potential liability related to the 2015, 2014 and 2013 grants are as follows:
In millions
 
Measurement period end date
 
Fair value accrued
at December 31, 2015
 
Maximum aggregate payout
Granted in 2013
 
December 31, 2015
 
$
18

 
$
24

Granted in 2014
 
December 31, 2016
 
13

 
28

Granted in 2015
 
December 31, 2017
 
7

 
29
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The following table summarizes the restricted stock awards activity for our employees during the last three years.
 
 
 
Shares of restricted stock
 
Weighted average remaining vesting period (in years)
 
Weighted average fair value
(per share)
Outstanding (1)
December 31, 2012
 
503,091

 
 
 
$
39.44

Issued
 
 
175,935

 
 
 
42.41

Forfeited
 
 
(33,352
)
 
 
 
40.64

Vested
 
 
(204,421
)
 
 
 
38.71

Outstanding (1)
December 31, 2013
 
441,253

 
 
 
$
40.82

Issued
 
 
262,235

 
 
 
47.03

Forfeited
 
 
(14,895
)
 
 
 
43.41

Vested
 
 
(225,683
)
 
 
 
42.31

Outstanding (1)
December 31, 2014
 
462,910

 
1.8

 
$
43.54

Issued
 
 
274,012

 
3.1

 
51.38

Forfeited
 
 
(13,390
)
 
2.5

 
45.60

Vested
 
 
(324,700
)
 
—

 
51.68

Outstanding (1)
December 31, 2015
 
398,832

 
1.4

 
$
46.92

(1) Subject to restriction.
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity
The following table provides additional information about our ESPP as of December 31.
 
 
2015
 
2014
 
2013
Shares purchased on the open market
 
106,994

 
100,199

 
97,734

Average purchase price (per share)
 
$
55.47

 
$
51.60

 
$
42.96

Total purchase price discount (in dollars)
 
$
793,931

 
$
739,598

 
$
628,358