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DEBT AND FINANCING ARRANGEMENTS - Credit facilities (Details) - Letter of Credit Facility - Citibank - USD ($) | Dec. 31, 2019 | Dec. 24, 2019 | Mar. 28, 2019 | Dec. 31, 2018 | Mar. 27, 2017 | Mar. 31, 2015 | Mar. 30, 2015 | Nov. 20, 2013
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Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum capacity |  |  |  |  |  | $ 500,000,000 | $ 750,000,000 | $ 750,000,000
Letters of credit outstanding | $ 357,000,000 |  |  | $ 395,000,000 |  |  |  |
$500 million secured LOC |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum capacity |  | $ 500,000,000 | $ 250,000,000 |  | $ 500,000,000 |  |  |
$250 million secured LOC |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum capacity |  |  |  |  | $ 250,000,000 |  |  |

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Balance Type: | credit
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Details
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