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STOCK INCENTIVE PLANS (Tables)
 12 Months Ended
Dec. 31, 2018
STOCK INCENTIVE PLANS [Abstract]  
Activity for restricted stock units
The following table summarizes RSU activity (in millions, except for share and per share amounts):
 
2018
 
2017
 
2016
 
Shares
Weighted
Average Price Per Share
 
Shares
Weighted
Average Price Per Share
 
Shares
Weighted
Average Price Per Share
Beginning nonvested units
352,919

$
226.31

 
373,403

$
221.77

 
432,783

$
213.45

    Issued
141,775

$
284.98

 
129,378

$
222.53

 
113,909

$
230.36

    Canceled
(56,393
)
$
245.08

 
(47,488
)
$
229.36

 
(62,869
)
$
229.70

    Vested
(94,487
)
$
233.75

 
(102,374
)
$
203.51

 
(110,420
)
$
193.51

Ending nonvested units
343,814

$
245.38

 
352,919

$
226.31

 
373,403

$
221.77

Fair value of shares vested
$22
 
 
$21
 
 
$21
 
 
 
 
 
 
 
 
 
 
Disclosure of Share-based Compensation, Stock Options
Transactions involving stock options are summarized as follows:
 
Shares Subject to Option
 
Weighted Average Price Per Share
 
Options Exercisable
Outstanding at January 1, 2016
2,226,286

 
$
169.96

 
1,411,460

Granted
294,874

 
$
234.25

 


Exercised
(317,110
)
 
$
108.28

 


Canceled or expired
(80,014
)
 
$
210.01

 


Outstanding at December 31, 2016
2,124,036

 
$
186.59

 
1,346,707

Granted
306,206

 
$
230.97

 


Exercised
(409,269
)
 
$
115.35

 


Canceled or expired
(87,260
)
 
$
222.00

 


Outstanding at December 31, 2017
1,933,713

 
$
207.10

 
1,375,844

Granted
204,250

 
$
276.64

 


Exercised
(931,929
)
 
$
193.68

 


Canceled or expired
(72,931
)
 
$
226.48

 


Outstanding at December 31, 2018
1,133,103

 
$
229.42

 
581,534
Information about stock options excercised
The following table summarizes information about stock options (in millions of dollars):
 
 
For the years ended December 31,
 
 
2018
 
2017
 
2016
Fair value of options exercised
 
$
38

 
$
11

 
$
8

Total intrinsic value of options exercised
 
102

 
47

 
36

Fair value of options vested
 
8

 
24

 
15

Settlements of options exercised
 
180

 
47

 
35
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range
Information about stock options outstanding and exercisable as of December 31, 2018, is as follows:
 
 
Options Outstanding
 
Options Exercisable
 
 
 
 
Weighted Average
 
 
 
 
Weighted Average
 
Range of
Exercise
Prices
 
Number
 
Remaining
Contractual
Life
 
Exercise
Price
 
Intrinsic
Value
(millions)
 
Number
 
Remaining
Contractual
Life
 
Exercise
Price
 
Intrinsic
Value
(millions)
$72.14 - $204.01
 
184,435

 
2.23 years
 
$
152.28

 
$
24

 
183,292

 
2.19 years
 
$
152.17

 
$
24

$223.68 - $276.64
 
948,668

 
7.37 years
 
$
244.42

 
36

 
398,242

 
6.10 years
 
$
238.88

 
17

 
 
1,133,103

 
6.54 years
 
$
229.42

 
$
60

 
581,534

 
4.87 years
 
$
211.55

 
$
41
Assumptions used to determine fair value of options granted
The fair value of options granted in 2018, 2017 and 2016 used the following assumptions:
 
 
For the years ended December 31,
 
 
2018
 
2017
 
2016
Risk-free interest rate
 
2.6%
 
2.0%
 
1.4%
Expected life
 
6 years
 
6 years
 
6 years
Expected volatility
 
27.5%
 
23.9%
 
24.5%
Expected dividend yield
 
1.9%
 
2.1%
 
2.0%