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Debt - Contractual Principal Payments (Details) - UAL And United $ in Millions	Sep. 30, 2023 USD ($)
Debt Instrument [Line Items]
Last three months of 2023	$ 739
2024	3,958
2025	3,442
2026	5,235
2027	2,464
After 2027	14,046
Total long-term debt	$ 29,884

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