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Contractual Principal Payments (Detail) - UAL and United
$ in Millions
Jun. 30, 2015
USD ($)
Debt Instrument [Line Items]  
Last six months of 2015 $ 585
2016 1,192
2017 775
2018 1,310
2019 1,736
After 2019 5,358
Long-term debt $ 10,956