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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of pre-tax compensation expense and the related income tax benefit for these stock-based incentives
Pre-tax compensation expense (income) for these stock-based incentives was as follows, in millions:
 
2018
 
2017
 
2016
Long-term stock awards
$
23

 
$
24

 
$
23

Stock options
3

 
3

 
2

Restricted stock units
4

 
2

 
—

Phantom stock awards and stock appreciation rights
(3
)
 
9

 
4

Total
$
27

 
$
38

 
$
29
Schedule of the Company's long-term stock award activity
Our long-term stock award activity was as follows, shares in millions:

 
2018
 
2017
 
2016
Unvested stock award shares at January 1
3

 
4

 
5

Weighted average grant date fair value
$
24

 
$
20

 
$
17

Stock award shares granted
1

 
1

 
1

Weighted average grant date fair value
$
41

 
$
34

 
$
26

Stock award shares vested
2

 
2

 
2

Weighted average grant date fair value
$
21

 
$
18

 
$
16

Stock award shares forfeited
—

 
—

 
—

Weighted average grant date fair value
$
31

 
$
24

 
$
20

Unvested stock award shares at December 31
2

 
3

 
4

Weighted average grant date fair value
$
30

 
$
24

 
$
20
Schedule of the Company's stock option activity
Our stock option activity was as follows, shares in millions:
 
2018
 
2017
 
2016
Option shares outstanding, January 1
5

 
7

 
12

Weighted average exercise price
$
16

 
$
15

 
$
17

Option shares granted
—

 
—

 
—

Weighted average exercise price
$
42

 
$
34

 
$
26

Option shares exercised
1

 
2

 
5

Aggregate intrinsic value on date of exercise (A)
$
55
 million
 
$
47
 million
 
$
64
 million
Weighted average exercise price
$
11

 
$
15

 
$
21

Option shares forfeited
—

 
—

 
—

Weighted average exercise price
$
31

 
$
—

 
$
—

Option shares outstanding, December 31
4

 
5

 
7

Weighted average exercise price
$
21

 
$
16

 
$
15

Weighted average remaining option term (in years)
5
 
4
 
4
Option shares vested and expected to vest, December 31
4

 
5

 
7

Weighted average exercise price
$
21

 
$
16

 
$
15

Aggregate intrinsic value (A)
$
36
 million
 
$
147
 million
 
$
118
 million
Weighted average remaining option term (in years)
5
 
4
 
4
Option shares exercisable (vested), December 31
3

 
4

 
6

Weighted average exercise price
$
16

 
$
13

 
$
13

Aggregate intrinsic value (A)
$
34
 million
 
$
123
 million
 
$
102
 million
Weighted average remaining option term (in years)
4
 
3
 
3
                                                                     
(A)
Aggregate intrinsic value is calculated using our stock price at each respective date, less the exercise price (grant date price) multiplied by the number of shares.
Schedule of weighted average grant date fair value of option shares granted and the assumptions used to estimate those values using a Black-Scholes option pricing model
The weighted average grant date fair value of option shares granted and the assumptions used to estimate those values using a Black-Scholes option pricing model were as follows:
 
2018
 
2017
 
2016
Weighted average grant date fair value
$
12.34

 
$
9.68

 
$
6.43

Risk-free interest rate
2.72
%
 
2.16
%
 
1.41
%
Dividend yield
1.02
%
 
1.19
%
 
1.49
%
Volatility factor
29.00
%
 
30.00
%
 
29.00
%
Expected option life
6 years

 
6 years

 
6 years
Summary of stock option shares outstanding and exercisable
The following table summarizes information for stock option shares outstanding and exercisable at December 31, 2018, shares in millions:
 
Option Shares Outstanding
 
Option Shares Exercisable
 
Range of
Prices
 
Number of
Shares
 
Weighted
Average
Remaining
Option Term
 
Weighted
Average
Exercise
Price
 
Number of
Shares
 
Weighted
Average
Exercise
Price
$
 7 - 13
 
1
 
2 years
 
$11
 
1
 
$11
$
17 - 26
 
2
 
5 years
 
$21
 
2
 
$20
$
30 - 43
 
1
 
9 years
 
$38
 
—
 
$34
$
7 - 43
 
4
 
5 years
 
$21
 
3
 
$16
Schedule of phantom stock awards and SARs
Information related to phantom stock awards and SARs was as follows, in millions:
 
Phantom Stock Awards
 
Stock Appreciation Rights
 
At December 31,
 
At December 31,
 
2018
 
2017
 
2018
 
2017
Accrued compensation cost liability
$
4

 
$
12

 
$
2

 
$
7

Unrecognized compensation cost
$
2

 
$
4

 
$
—

 
$
—

Equivalent common shares
—

 
—

 
—

 
—