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LONG-TERM DEBT - LINE OF CREDIT (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($) airline | Mar. 31, 2020 USD ($)
Line of Credit Facility [Line Items] |  |
Proceeds from Issuance of Secured Debt | $ 189 | $ 825
Adjustments to Additional Paid in Capital, Warrant Issued | $ 8 |
Line of Credit Facility, Number of Credit Facilities | airline | 3 |
Line of Credit Facility, Maximum Borrowing Capacity | $ 461 |
Line of Credit Facility, Asset Restrictions | 500 |
Credit Facility 1 [Member] | Secured by certain accounts receivable, spare engines, spare parts and ground service equipment [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | 120 |
Credit Facility 2 [Member] | Secured by aircraft [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | 250 |
Credit Facility 3 [Member] | Secured by aircraft [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | 91 |
Credit Facilities 1 & 2 [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Maximum Month-end Outstanding Amount | 363 |
US Treasury CARES Act Loan [Member] |  |
Line of Credit Facility [Line Items] |  |
Adjustments to Additional Paid in Capital, Warrant Issued | 6 |
Line of Credit Facility, Maximum Borrowing Capacity | 1,900 |
Line of Credit Facility, Maximum Month-end Outstanding Amount | $ 135 |

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- Definition Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109126253&loc=d3e4724-112606 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + 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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