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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |
2018 |  | $ 177 |  |
2019 |  | 139 |  |
2020 |  | 99 |  |
2021 |  | 69 |  |
2022 |  | 48 |  |
Thereafter |  | 127 |  |
Minimum lease payments |  | 659 |  |
Operating leases, rent expense |  | 219 | $ 216 | $ 224
Purchase obligation |  | 99 |  |
Purchase obligation in 2018 |  | 53 |  |
Purchase obligation in 2019 through 2020 |  | $ 21 |  |
Agreement to outsource billing and collection function | 10 years |  |  |
Remaining terms of lease obligations, maximum |  | 30 years |  |
Litigation reserves |  | $ 2 | 5 |
Self-insurance reserves |  | 118 | $ 117 |
Letter of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letters of credit outstanding, amount |  | $ 71 |  |

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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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