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STOCK-BASED COMPENSATION PLANS (Tables)
 12 Months Ended
Dec. 31, 2017
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 [Table Text Block]
The table below summarizes the components of total stock-based compensation (in millions):
 
2017
 
2016
 
2015
Stock options
$
3

 
$
2

 
$
2

Stock awards
24

 
11

 
11

Deferred stock awards
1

 
1

 
1

Employee stock purchase plan
6

 
5

 
3

Stock-based compensation
$
34

 
$
19

 
$
17

 
 
 
 
 
 
Tax benefit related to stock-based compensation
$
13

 
$
7

 
$
7
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]
Unrecognized stock-based compensation for non-vested options and awards and the weighted-average period the expense will be recognized (in millions):
 
Amount
 
Weighted-Average
Period
Stock options
$
3

 
1.2
Stock awards
34

 
1.7
Unrecognized stock-based compensation
$
37

 
1.7
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of each option grant was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions used for grants:
 
2017
 
2016
 
2015
Expected volatility
51
%
 
51
%
 
53
%
Expected term
6 years

 
6 years

 
6 years

Risk-free interest rate
2.04
%
 
1.23
%
 
1.67
%
Expected dividend yield
1.10
%
 
1.50
%
 
1.25
%
Weighted-average grant date fair value per share
$
41.19

 
$
27.14

 
$
28.71

Estimated fair value of options granted (millions)
$
4

 
$
2

 
$
3
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The tables below summarize stock option activity for the year ended December 31, 2017:
 
Shares
 
Weighted-
Average Exercise Price Per Share
 
Weighted-
Average
Contractual Life (Years)
 
Aggregate Intrinsic
Value
(in millions)
Outstanding, December 31, 2016
453,674

 
$
40.02

 
6.2
 
$
22

Granted
88,580

 
94.67

 
 
 
 
Exercised
(91,013
)
 
31.31

 
 
 
 
Canceled
—

 
—

 
 
 
 
Forfeited or expired
(9,774
)
 
60.33

 
 
 
 
Outstanding, December 31, 2017
441,467

 
$
52.34

 
6.0
 
$
11

 
 
 
 
 
 
 
 
Exercisable, December 31, 2017
229,233

 
$
32.08

 
4.9
 
$
9

Vested or expected to vest, December 31, 2017
441,467

 
$
52.34

 
6.0
 
$
11


 (in millions)
2017
 
2016
 
2015
Intrinsic value of option exercises
$
6

 
$
9

 
$
14

Cash received from stock option exercises
3

 
3

 
4

Tax benefit related to stock option exercises
2

 
3

 
5

Fair value of options vested
3

 
3

 
3
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
The following table summarizes information about outstanding stock awards:
 
Number
of Units
 
Weighted-Average Grant Date Fair Value
 
Weighted-
Average
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value (in
millions)
Non-vested, December 31, 2016
440,093

 
$
63.86

 
1.4
 
$
39

Granted
433,340

 
88.43

 
 
 
 

Vested
(286,138
)
 
61.47

 
 
 
 

Forfeited
(62,150
)
 
65.06

 
 
 
 

Non-vested, December 31, 2017
525,145

 
$
85.47

 
1.6
 
$
39