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Contractual Principal Payments (Detail) - UAL and United
$ in Millions
Mar. 31, 2017
USD ($)
Debt Instrument [Line Items]  
Last nine months of 2017 $ 537
2018 1,466
2019 1,054
2020 1,058
2021 1,043
After 2021 6,873
Long-term debt $ 12,031