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COMMITMENTS AND CONTINGENCIES (Details) | Mar. 31, 2022 USD ($) claim | Dec. 31, 2021 USD ($) | Dec. 31, 2020 claim | Oct. 31, 2020 claim
--- | --- | --- | --- | ---
Loss Contingencies [Line Items] |  |  |  |
Class action lawsuits | claim | 2 |  | 2 | 2
Debt Instrument [Line Items] |  |  |  |
Self-insurance reserves | $ 158,000,000 | $ 159,000,000 |  |
Secured Receivables Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility capacity | 600,000,000 |  |  |
Letters of credit outstanding, amount | 70,000,000 |  |  |
Secured Receivables Credit Facility | Letter of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility capacity | 100,000,000 |  |  |
Senior Unsecured Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility capacity | 750,000,000 |  |  |
Senior Unsecured Revolving Credit Facility | Letter of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility capacity | 150,000,000 |  |  |
Excludes general and professional liability claims |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Litigation reserves | $ 3,000,000 | $ 4,000,000 |  |

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