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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Weighted Average Assumptions Used in Calculating the Fair Value of Stock Option
The following weighted average assumptions were used to calculate the fair values of stock option grants in each year:
 
2013
 
2012
 
2011
Risk free interest rate
1.3
%
 
1.3
%
 
2.9
%
Expected life of option in years
6.5

 
6.5

 
6.4

Expected dividend yield
3.2
%
 
3.3
%
 
3.3
%
Expected volatility
29.9
%
 
29.4
%
 
28.0
%
Stock Options Outstanding, Exercisable and Activity
A summary of stock options outstanding and exercisable and activity for the year ended December 31, 2013 is presented below:
 
Number of
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Life
(in years)
 
Intrinsic
Value
(in millions)
Outstanding, January 1, 2013
3,408,699

 
$
71.34

 
6.6
 
$
218

Granted
525,299

 
$
131.55

 
 
 
 
Exercised
(1,185,030
)
 
$
58.42

 
 
 
 
Forfeited/Expired
(104,580
)
 
$
97.15

 
 
 
 
Outstanding, December 31, 2013
2,644,388

 
$
88.08

 
6.9
 
$
269

Vested or expected to vest,
December 31, 2013
2,595,586

 
$
87.76

 
6.8
 
$
265

Exercisable, December 31, 2013
862,065

 
$
60.49

 
4.3
 
$
111
Stock Option Activity
The following table presents stock option activity for the years ended December 31, 2013, 2012 and 2011:
(Millions)
2013
 
2012
 
2011
Total intrinsic value of stock options exercised
$
110

 
$
110

 
$
40

Cash received from stock option exercises
68

 
122

 
81

Income tax benefit from the exercise of stock options
36

 
35

 
9

Total fair value of stock options vested
11

 
6

 
10
RSU Activity
The following table summarizes RSU activity for the year ended December 31, 2013: 
 
Number of
Shares
 
Weighted
Average
Fair Value
 
Intrinsic
Value
(in millions)
Outstanding, January 1, 2013
953,936

 
$
67.11

 
$
129

Granted
190,640

 
$
126.55

 
 
Additional shares vested
229,007

 
$
82.22

 
 
Released from restrictions
(499,184
)
 
$
55.04

 
 
Forfeited
(13,742
)
 
$
93.94

 
 
Outstanding, December 31, 2013
860,657

 
$
90.15

 
$
163

Vested or expected to vest, December 31, 2013
846,190

 
$
90.02

 
$
160