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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
2019 |  | $ 181 |  |
2020 |  | 143 |  |
2021 |  | 106 |  |
2022 |  | 79 |  |
2023 |  | 60 |  |
Thereafter |  | 122 |  |
Minimum lease payments |  | 691 |  |
Operating leases, rent expense |  | 220 | $ 219 | $ 216
Purchase obligation |  | 157 |  |
Purchase obligation in 2018 |  | 68 |  |
Purchase obligation in 2019 through 2020 |  | $ 66 |  |
Agreement to outsource billing and collection function | 10 years |  |  |
Remaining terms of lease obligations, maximum |  | 29 years |  |
Litigation reserves |  | $ 1 | 2 |
Self-insurance reserves |  | 125 | $ 118 |
Letter of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letters of credit outstanding, amount |  | $ 71 |  |

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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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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