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Debt - Contractual Principal Payments under Outstanding Long-Term Debt Agreements (Details) - UAL and United
$ in Millions
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]  
2021 $ 1,911
2022 3,852
2023 2,699
2024 5,132
2025 3,739
After 2025 9,968
Long-term debt $ 27,301