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Contractual Principal Payments Not Including Debt Discount Or Debt Issuance Costs (Detail) - UAL and United
$ in Millions
Jun. 30, 2017
USD ($)
Debt Instrument [Line Items]  
Last six months of 2017 $ 333
2018 1,495
2019 1,082
2020 1,086
2021 1,071
After 2021 7,199
Long-term debt $ 12,266