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Debt - Contractual Principal Payments (Details) - UAL And United
$ in Millions
Jun. 30, 2019
USD ($)
Debt Instrument [Line Items]  
Last six months of 2019 $ 757
2020 1,350
2021 1,344
2022 1,697
2023 747
After 2023 8,484
Long-term debt $ 14,379