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Contractual Principal Payments Not Including Debt Discount Or Debt Issuance Costs (Detail) - UAL and United
$ in Millions
Sep. 30, 2017
USD ($)
Debt Instrument [Line Items]  
Last three months of 2017 $ 184
2018 1,527
2019 1,115
2020 1,120
2021 1,107
After 2021 7,963
Long-term debt $ 13,016