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Debt - Contractual Principal Payments (Details) - UAL And United
$ in Millions
Jun. 30, 2018
USD ($)
Debt Instrument [Line Items]  
Last six months of 2018 $ 394
2019 1,244
2020 1,242
2021 1,230
2022 1,565
After 2022 7,838
Long-term debt $ 13,513