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STOCKHOLDERS’ EQUITY AND REDEEMABLE NONCONTROLLING INTEREST (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jul. 01, 2015
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends per common share | $ 0.53 | $ 0.53 | $ 0.53 | $ 0.53 | $ 0.50 | $ 0.50 | $ 0.50 |  |  |
Share repurchase authorization remaining available | $ 442 |  |  |  |  |  |  | $ 442 |  |
Purchases of treasury stock, value | 50 |  |  |  | $ 100 |  |  | $ 150 | $ 150 |
Reissuance of shares for employee benefit plan |  |  |  |  |  |  |  | 1.8 | 1.7 |
UMass Joint Venture |  |  |  |  |  |  |  |  |  |
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  |  |  |  |  |  |  |  |  | 18.90%
Treasury Stock, at Cost [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock- shares |  |  |  |  |  |  |  | 1.6 | 1.4 |
Purchases of treasury stock, value | $ 50 |  |  |  | $ 100 |  |  | $ 150 | $ 150 |

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