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STOCKHOLDERS’ EQUITY AND REDEEMABLE NONCONTROLLING INTEREST (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Mar. 31, 2021 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 30, 2020 | Nov. 30, 2019 | 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 | $ 0.53 | $ 0.53 | $ 0.53 | $ 0.53 | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 |  |  |  |  |  |  |  |  |
Additional authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |
Stock repurchase program, remaining authorized repurchase amount |  | $ 1,200 |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200 |  |  |  |  |  |  |
Treasury stock value acquired cost method |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350 | $ 325 | $ 465 |  |  |  |  |
Reissuance of shares for employee benefit plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 | 3,000,000 | 2,000,000 |  |  |  |  |
Contributions from noncontrolling interest partners |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 16 | $ 4 |  |  |  |  |
Redeemable noncontrolling interest |  | 76 |  |  |  | $ 77 |  |  |  |  |  |  |  |  | 76 | 77 |  |  |  |  |  |
UMass Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18.90% |  |
Redeemable noncontrolling interest |  | $ 76 |  |  |  | 77 |  |  |  |  |  |  |  |  | $ 76 | $ 77 |  |  |  |  |  |
Treasury Stock, at Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500,000 | 3,400,000 | 4,600,000 |  |  |  |  |
Treasury stock value acquired cost method |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350 | $ 325 | $ 465 |  |  |  |  |
Treasury Stock, at Cost | Accounts Payable and Accrued Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual |  |  |  |  |  | $ 3 |  |  |  |  |  |  |  |  |  | $ 3 |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per common share | $ 0.56 |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.24 |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in quarterly dividends as percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.70% |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |

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