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DERIVATIVE INSTRUMENTS (Tables) | 12 Months Ended
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Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | Fair values of derivative instruments on the consolidated balance sheet (in millions):
| 2023 |  | 2022
Fuel hedge contracts (not designated as hedges) |  |  |
Other current assets | $ | 10 |  |  | $ | 33 |
Other assets | 1 |  |  | 11 |
Interest rate swaps (designated as hedges) |  |  |
Other current assets | 6 |  |  | 8 |
Other noncurrent assets | 2 |  |  | 7 |
(Losses)/gains in accumulated other comprehensive loss (AOCL) | (7) |  |  | 23 |
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block] | Pretax effect of derivative instruments on earnings and AOCL (in millions):
| 2023 |  | 2022 |  | 2021
Fuel hedge contracts (not designated as hedges) |  |  |  |  |
(Losses)/gains recognized in Aircraft fuel | $ | (62) |  |  | $ | 93 |  |  | $ | 104 |
Interest rate swaps (designated as hedges) |  |  |  |  |
(Losses)/gains recognized in other comprehensive income (OCI) | (7) |  |  | 23 |  |  | 17 |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B + Details
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