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Debt - Contractual Principal Payments under Outstanding Long-Term Debt Agreements (Details) - UAL and United
$ in Millions
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]  
2022 $ 3,002
2023 2,853
2024 3,908
2025 3,378
2026 5,134
After 2026 15,601
Long-term debt $ 33,876