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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment, net (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Less: accumulated depreciation and amortization | $ (21,707) | $ (20,370)
Total property and equipment, net | 35,486 | 33,109
Flight equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 40,976 | 38,091
Flight equipment | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life | 25 years |
Flight equipment | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life | 34 years |
Ground property and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 9,986 | 8,996
Ground property and equipment | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life | 3 years |
Ground property and equipment | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life | 40 years |
Information technology-related assets |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 3,307 | 3,375
Information technology-related assets | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life | 3 years |
Information technology-related assets | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life | 15 years |
Flight and ground equipment under finance leases |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 1,862 | 1,950
Less: accumulated depreciation and amortization | (525) | (463)
Advance payments for equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 1,062 | $ 1,067

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- Definition Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (a) -SubTopic 20 -Topic 842 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-4 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -SubTopic 20 -Topic 842 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount, after accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -SubTopic 20 -Topic 842 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount, before accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(18)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -SubTopic 20 -Topic 842 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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