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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2016 USD ($) Years | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |
2017 |  | $ 179 |  |
2018 |  | 129 |  |
2019 |  | 92 |  |
2020 |  | 64 |  |
2021 |  | 44 |  |
Thereafter |  | 153 |  |
Minimum lease payments |  | 661 |  |
Operating leases, rent expense |  | 216 | $ 224 | $ 242
Purchase obligation |  | 111 |  |
Purchase obligation in 2017 |  | 66 |  |
Purchase obligation in 2018 through 2019 |  | $ 21 |  |
Agreement to outsource billing and collection function | 10 years |  |  |
Remaining terms of lease obligations, maximum | Years |  | 31 |  |
Litigation reserves |  | $ 5 | 9 |
Self-insurance reserves |  | 117 | $ 124 |
Letter of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letters of credit outstanding, amount |  | $ 68 |  |

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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=25496072&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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