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COMMITMENTS AND CONTINGENCIES (Details) | 1 Months Ended | 7 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2019 USD ($) claim | Dec. 31, 2019 USD ($) | Oct. 25, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Purchase obligation |  | $ 210,000,000 | $ 210,000,000 |  |  |
Purchase obligation in 2020 |  | 83,000,000 | 83,000,000 |  |  |
Purchase obligation in 2021 through 2022 |  | 91,000,000 | $ 91,000,000 |  |  |
Agreement to outsource billing and collection function | 10 years |  |  |  |  |
Remaining terms of lease obligations, maximum |  |  | 28 years |  |  |
Litigation reserves |  | 1,000,000 | $ 1,000,000 |  | $ 1,000,000 |
Self-insurance reserves |  | $ 132,000,000 | 132,000,000 |  | $ 125,000,000 |
AMAC Data Security Incident |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
New claims filed (in lawsuits) | claim |  | 39 |  |  |  |
Letter of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Letters of credit outstanding, amount |  | $ 71,000,000 | 71,000,000 |  |  |
Secured Receivables Credit Facility (3.39% at December 31, 2018) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility capacity |  |  |  | $ 600,000,000 |  |
Secured Receivables Credit Facility (3.39% at December 31, 2018) | Letter of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility capacity |  | 100,000,000 | 100,000,000 |  |  |
Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility capacity |  |  |  |  |  | $ 750,000,000
Revolving Credit Facility | Letter of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility capacity |  | $ 150,000,000 | $ 150,000,000 |  |  |

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