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STOCKHOLDERS’ EQUITY AND REDEEMABLE NONCONTROLLING INTEREST (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
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Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | 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, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 22, 2021 | Feb. 04, 2021 | Jul. 01, 2015
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 |  |  |  |
Common stock, shares authorized |  | 600,000,000 |  |  |  | 600,000,000 |  |  |  |  |  |  |  |  | 600,000,000 | 600,000,000 |  |  |  |
Dividends per common share |  | $ 0.56 | $ 0.56 | $ 0.56 | $ 0.56 | $ 0.53 | $ 0.53 | $ 0.53 | $ 0.53 | $ 0.53 | $ 0.50 | $ 0.50 | $ 0.50 |  |  |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  | $ 900,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 900,000,000 |  |  |  |  |
Treasury stock value acquired cost method |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 325,000,000 | $ 350,000,000 | $ 325,000,000 |  |  |
Reissuance of shares for employee benefit plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 | 2,000,000 | 3,000,000 |  |  |
Contributions from noncontrolling interest partners |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 16,000,000 |  |  |
Redeemable noncontrolling interest |  | 82,000,000 |  |  |  | $ 76,000,000 |  |  |  |  |  |  |  |  | 82,000,000 | 76,000,000 |  |  |  |
UMass Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18.90%
Redeemable noncontrolling interest |  | $ 82,000,000 |  |  |  | $ 76,000,000 |  |  |  |  |  |  |  |  | $ 82,000,000 | $ 76,000,000 |  |  |  |
Treasury Stock, at Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 | 3,500,000 | 3,400,000 |  |  |
Treasury stock value acquired cost method |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 325,000,000 | $ 350,000,000 | $ 325,000,000 |  |  |
Treasury Stock, at Cost | Accounts Payable and Accrued Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  | $ 3,000,000 |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per common share | $ 0.62 |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.48 |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in quarterly dividends as percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.70% |
Additional authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |

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