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Contractual Principal Payments (Detail) - UAL and United - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
2017 $ 849  
2018 1,427  
2019 1,852  
2020 1,007  
2021 1,174  
After 2021 4,582  
Long-term debt $ 10,891 $ 11,042