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Debt - Narrative (Details)	1 Months Ended
	May 31, 2019 USD ($)	Feb. 28, 2019 trust	Jun. 30, 2019 USD ($)
Debt Instrument [Line Items]
Number of pass-through trusts created | trust		2
Revolving Credit Facility | United Airlines, Inc. | Secured Debt
Debt Instrument [Line Items]
Available under revolving credit facility			$ 2,000,000,000.0
4.875% Senior Notes due 2025 | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 350,000,000
Interest rate	4.875%
Redemption price rate	101.00%

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