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Debt - Schedule of Contractual Principal Payments (Details) - UAL And United $ in Millions	Sep. 30, 2024 USD ($)
Debt Instrument [Line Items]
Last three months of 2024	$ 900
2025	2,952
2026	4,770
2027	2,301
2028	1,764
After 2028	13,011
Total long-term debt	$ 25,698

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