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Contractual Principal Payments (Detail) - UAL and United
$ in Millions
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]  
Last nine months of 2018 $ 1,380
2019 1,218
2020 1,207
2021 1,194
2022 1,529
After 2022 7,457
Long-term debt $ 13,985