SUPPLEMENTAL INFORMATION (Details) - USD ($) $ in Millions |
1 Months Ended | 3 Months Ended | 4 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Organization, Consolidation and Presentation of Financial Statements [Abstract] | ||||||||||
| REVENUE | $ 7,787 | $ 6,462 | $ 22,855 | $ 20,432 | $ 30,642 | $ 26,894 | ||||
| OPERATING EXPENSES: | ||||||||||
| Salaries and employee benefits | 2,550 | 2,331 | 7,434 | 7,078 | 9,984 | 9,409 | ||||
| Purchased transportation | 2,110 | 1,688 | 6,455 | 5,419 | 8,565 | 7,107 | ||||
| Rentals and landing fees | 394 | 365 | 1,183 | 1,129 | 1,577 | 1,494 | ||||
| Fuel | 406 | 235 | 1,270 | 774 | 1,676 | 1,009 | ||||
| Depreciation and amortization | 323 | 330 | 967 | 972 | 1,290 | 1,302 | ||||
| Maintenance and repairs | 263 | 255 | 794 | 784 | 1,057 | 1,039 | ||||
| Other, net | 1,197 | 1,101 | 3,685 | 3,304 | 4,882 | 4,405 | ||||
| Total operating expenses | 7,243 | 6,305 | 21,788 | 19,460 | 29,031 | 25,765 | ||||
| OPERATING INCOME | 544 | 157 | 1,067 | 972 | 1,611 | 1,129 | ||||
| OTHER (EXPENSE) INCOME: | ||||||||||
| Gain on short-term investment | 4,492 | 0 | (1,238) | 0 | 3,254 | 0 | ||||
| Interest, net | (23) | (41) | (66) | (125) | (89) | (166) | ||||
| Other non-operating, net | 199 | 15 | 661 | 67 | 860 | 82 | ||||
| Total Other (Expense) Income | 4,668 | (26) | (643) | (58) | 4,025 | (84) | ||||
| INCOME BEFORE INCOME TAXES | 5,212 | 131 | 424 | 914 | 5,636 | 1,045 | ||||
| PROVISION FOR INCOME TAXES | 171 | 30 | 134 | 269 | 305 | 299 | ||||
| INCOME FROM CONTINUING OPERATIONS | 5,041 | 101 | 290 | 645 | 5,331 | 746 | ||||
| INCOME FROM DISCONTINUED OPERATIONS, NET OF TAXES | 0 | 116 | 0 | 275 | 0 | 391 | ||||
| NET INCOME | $ 5,041 | $ 217 | $ 290 | $ 920 | $ 5,331 | [1] | $ 1,137 | [1] | ||
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| X | ||||||||||
- Definition Purchased transportation costs. No definition available.
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| X | ||||||||||
- Definition Rental expense for leased assets including aircraft, vehicles, equipment and facilities; as well as fees paid to an airport or other governmental agency for each aircraft landing. No definition available.
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| X | ||||||||||
- Definition The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Total costs of sales and operating expenses for the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount after tax of income (loss) from continuing operations attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of interest income (expense) classified as nonoperating. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The net result for the period of deducting operating expenses from operating revenues. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References No definition available.
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| X | ||||||||||
- Definition The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of income (expense) related to nonoperating activities, classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of unrealized gain (loss) on investment. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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