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Debt - Contractual Principal Payments (Details) - UAL And United
$ in Millions
Sep. 30, 2022
USD ($)
Debt Instrument [Line Items]  
Last three months of 2022 $ 759
2023 2,929
2024 3,908
2025 3,358
2026 5,148
After 2026 15,755
Long-term debt $ 31,857