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Debt - Schedule of Contractual Principal Payments (Details) - UAL And United $ in Millions	Jun. 30, 2024 USD ($)
Debt Instrument [Line Items]
Last six months of 2024	$ 3,349
2025	2,900
2026	4,694
2027	2,225
2028	1,688
After 2028	11,837
Total long-term debt	$ 26,693

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