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LEASES - NARRATIVE (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) aircraft | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Sublease Income | $ 16 | $ 14 | $ 13
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 273 |  |
Operating Lease, Payments | 359 |  |
Lessor, Operating Lease, Lease Not yet Commenced, Assumption and Judgment, Value of Underlying Asset, Amount | $ 730 |  |
Property Subject to Operating Lease [Member] | Airbus |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft | 61 |  |
Property Subject to Operating Lease [Member] | Q400 |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft | 7 |  |
Property Subject to Operating Lease [Member] | E175 [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft | 32 |  |
Property Subject to Operating Lease [Member] | B737 |  |  |
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 | 5 |  |
Airport Facilities [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Variable Lease, Cost | $ 377 | 286 | 322
Aircraft Leases [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Variable Lease, Cost | $ 5 | 1 | 4
Aircraft Leases [Member] | Maximum [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract | 12 years |  |
Corporate real estate [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Variable Lease, Cost | $ 17 | $ 12 | $ 10

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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 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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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- Definition Amount of sublease income excluding finance and operating lease expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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