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DEBT - Schedule of Contractual Principal Payments (Details) - UAL And United $ in Millions	Sep. 30, 2025 USD ($)
Debt Instrument [Line Items]
Last Three Months of 2025	$ 397
2026	4,092
2027	2,008
2028	1,835
2029	2,928
After 2029	10,403
Total	$ 21,664

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