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COMMITMENTS AND CONTINGENCIES (Details) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2020 USD ($) claim | Oct. 22, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |
Purchase obligation |  | $ 334,000,000 |  |
Purchase obligation in 2020 |  | 106,000,000 |  |
Purchase obligation in 2021 through 2022 |  | $ 103,000,000 |  |
Agreement to outsource billing and collection function | 10 years |  |  |
Remaining terms of lease obligations, maximum |  | 27 years |  |
New claims filed (in lawsuits) | claim |  | 2 |  |
Litigation reserves |  | $ 1,000,000 |  | $ 1,000,000
Self-insurance reserves |  | 138,000,000 |  | $ 132,000,000
Letter of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letters of credit outstanding, amount |  | $ 70,000,000 |  |
Secured Receivables Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility capacity |  |  | $ 600,000,000 |
Secured Receivables Credit Facility | Letter of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility capacity |  |  | $ 100,000,000 |

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