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STOCKHOLDERS’ EQUITY AND REDEEMABLE NONCONTROLLING INTEREST (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 5 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jul. 01, 2015 | May 04, 2006 | May 03, 2006
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.00 |  |  |  |  |
Preferred stock, shares outstanding | 0 |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Common stock, par value | $ 0.01 |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  | $ 0.01 |
Common stock, shares authorized | 600,000,000 |  |  |  | 600,000,000 |  |  |  |  |  |  |  |  | 600,000,000 | 600,000,000 |  |  | 600,000,000 | 300,000,000
Dividends per common share | $ 0.53 | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.4 | $ 0.4 | $ 0.40 |  |  |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount | $ 592 |  |  |  |  |  |  |  |  |  |  |  |  | $ 592 |  |  |  |  |
Treasury stock value acquired cost method |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 325 | $ 465 | $ 590 |  |  |
Reissuance of shares for employee benefit plan |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 | 2,000,000 | 2,000,000 |  |  |
Contributions from noncontrolling interest partners |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16 | $ 4 | $ 0 |  |  |
Redeemable noncontrolling interest | 77 |  |  |  | $ 80 |  |  |  |  |  |  |  |  | 77 | 80 |  |  |  |
UMass Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18.90% |  |
Redeemable noncontrolling interest | $ 77 |  |  |  | 80 |  |  |  |  |  |  |  |  | $ 77 | $ 80 |  |  |  |
Treasury Stock, at Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock, shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,400,000 | 4,600,000 | 7,400,000 |  |  |
Treasury stock value acquired cost method |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 325 | $ 465 | $ 590 |  |  |
Treasury Stock, at Cost | Accounts Payable and Accrued Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock value acquired cost method |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3 |  |  |  |  |
Share Repurchases Open Market [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional authorized amount |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Accelerated Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock, shares |  |  |  |  |  | 300,000 | 2,800,000 |  |  |  |  |  | 3,100,000 |  |  | 3,100,000 |  |  |
Treasury stock value acquired cost method |  |  |  |  |  |  |  |  |  |  |  |  | $ 250 |  |  |  |  |  |
Treasury stock acquired accelerated share repurchase, final purchase price, per share |  |  |  |  |  |  |  |  |  |  |  |  | $ 81.04 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |

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