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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Litigation reserves | $ 5,000,000 |  | $ 2,000,000
Self-insurance reserves | 123,000,000 |  | $ 118,000,000
Senior Unsecured Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility capacity | 750,000,000 |  |
Secured Receivables Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Letters of credit outstanding, amount | 71,000,000 |  |
Letter of Credit [Member] | Senior Unsecured Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility capacity | 150,000,000 | $ 150,000,000 |
Letter of Credit [Member] | Secured Receivables Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility capacity | $ 100,000,000 |  |

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- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of the accrued liability on an undiscounted basis for malpractice claims (including general and professional liability) at the end of the accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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