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STOCK-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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