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DEBT - Contractual Principal Payments under Outstanding Long-Term Debt Agreements (Details) - UAL and United $ in Millions	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
2025	$ 2,973
2026	4,793
2027	2,326
2028	1,791
2029	2,892
After 2029	10,062
Total	$ 24,837

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