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LONG-TERM DEBT - LINE OF CREDIT (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) credit_facility | Sep. 30, 2020 USD ($) | Sep. 01, 2020 USD ($) | Jun. 30, 2020 USD ($)
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, borrowing capacity | $ 461,000,000 |  |  |
Number of credit facilities | credit_facility | 3 |  |  |
Line of Credit Facility, Periodic Payment, Principal | $ 37,000,000 |  |  |
Proceeds from Lines of Credit | 400,000,000 |  |  |
Credit Facility 1 [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, asset restrictions, unrestricted cash and marketable securities | $ 500,000,000 |  |  |
Credit Facility 1 [Member] | Secured by aircraft [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, borrowing capacity |  |  |  | $ 250,000,000
Number of credit facilities | credit_facility | 1 |  |  |
Credit Facility 2 [Member] | Secured by other [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, borrowing capacity | $ 120,000,000 |  | $ 150,000,000 |
Credit Facility 3 [Member] | Secured by aircraft [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, borrowing capacity |  | $ 91,000,000 |  |
US Treasury CARES Act Loan |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, borrowing capacity | 1,900,000,000 |  |  |
Proceeds from Lines of Credit | $ 135,000,000 |  |  |

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- Definition Line of Credit Facility, Asset Restrictions, Unrestricted Cash and Marketable Securities + References No definition available. + Details
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- Definition Line of Credit Facility, Number of Credit Facilities + References No definition available. + Details
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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=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of the required periodic payment applied to principal. + 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=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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