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DEBT AND FINANCING ARRANGEMENTS - Credit facilities (Details) - USD ($) |  | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2018 | Mar. 28, 2018 | Mar. 27, 2017 | Mar. 26, 2017 | Aug. 02, 2016 | Mar. 31, 2015 | Mar. 30, 2015
Letter of Credit Facility | Citibank |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum capacity |  |  |  | $ 750,000,000 |  |  |  | $ 500,000,000 | $ 750,000,000
LOC Facility term | 4 years |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  | $ 395,000,000 |  |  |  |  |  |
Revolving Credit Facility | Syndication Of Lenders |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Potential increase in maximum capacity |  |  | $ 150,000,000 |  |  |  |  |  |
Credit Agreement | Letter of Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum capacity |  |  |  |  |  | $ 250,000,000 |  |  |
$500 million secured LOC | Letter of Credit Facility | Citibank |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum capacity |  |  |  | $ 500,000,000 | $ 500,000,000 |  |  |  |
$250 million secured LOC | Letter of Credit Facility | Citibank |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum capacity |  |  |  |  | $ 250,000,000 |  |  |  |
Novae Syndicated Bank Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Interest Expense |  | $ 1,000,000 |  |  |  |  |  |  |
Novae Syndicated Bank Facility | Letter Of Credit And Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum capacity |  |  |  |  |  |  | $ 229,000,000 |  |
Term Loan | Novae Syndicated Bank Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 67,000,000 |  |

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- Definition The potential increase in the maximum borrowing capacity under the credit facility at the request of the entity, subject to specified conditions. + References No definition available. + Details
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- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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