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Debt - Contractual Principal Payments under Outstanding Long-Term Debt Agreements (Details) - UAL and United
$ in Millions
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]  
2023 $ 2,911
2024 3,938
2025 3,392
2026 5,185
2027 2,405
After 2027 13,749
Long-term debt $ 31,580