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Debt - Contractual Principal Payments (Details) - UAL And United
$ in Millions
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]  
Last three months of 2019 $ 511
2020 1,363
2021 1,355
2022 1,708
2023 758
After 2023 8,629
Long-term debt $ 14,324