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LONG-TERM DEBT - LINE OF CREDIT (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 USD ($) airline | Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) airline | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Secured Debt |  |  |  | $ 363 | $ 1,265 |
Adjustments to Additional Paid in Capital, Warrant Issued | $ 8 | $ 8 | $ 7 |  |  |
Line of Credit Facility, Number of Credit Facilities | airline | 3 |  |  | 3 |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 486 |  |  | $ 486 |  |
Line of Credit Facility, Asset Restrictions | 500 |  |  | 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 | 150 |  |  | 150 |  |
Credit Facility 2 [Member] | Secured by aircraft [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 250 |  |  | 250 |  |
Credit Facility 3 [Member] | Secured by aircraft [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 86 |  |  | 86 |  |
US Treasury CARES Act Loan [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 1,900 |  |  | $ 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=123466302&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=123467817&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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