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LEASES - NARRATIVE (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) aircraft | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Sublease Income | $ 15 | $ 15 | $ 16
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 178 | 461 | 273
Operating Lease, Payments | 348 |  |
Finance Lease, Principal Payments | $ 211 |  |
Finance leased asset, Number of units | aircraft | 1 |  |
Lessor, Operating Lease, Lease Not yet Commenced, Assumption and Judgment, Value of Underlying Asset, Amount | $ 47 |  |
E175 [Member] | Maximum [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract | 11 years |  |
B737 MAX [Member] | Maximum [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract | 12 years |  |
B-737-800F | Maximum [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract | 11 years |  |
Property Subject to Operating Lease [Member] | E175 [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft | 42 |  |
Property Subject to Operating Lease [Member] | B737-800 |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft | 10 |  |
Property Subject to Operating Lease [Member] | B737 MAX [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft | 14 |  |
Property Subject to Operating Lease [Member] | A320, nonop [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft | 16 |  |
Property Subject to Operating Lease [Member] | B-737-800F |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft | 1 |  |
Airport Facilities [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Variable Lease, Cost | $ 447 | 381 | 377
Aircraft Leases [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Variable Lease, Cost | 10 | 10 | 5
Corporate real estate [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Variable Lease, Cost | $ 15 | $ 27 | $ 17

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- Definition Amount of cash outflow for principal payment on finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-5 + 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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- Definition Amount lessor expects from underlying asset following end of operating lease term for lease that has not yet commenced. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479773/842-30-50-3 + Details
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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