Commitments and Contingencies - Additional Information (Detail) Employee in Thousands, $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($) Employee Aircraft	Jul. 31, 2015 Aircraft
Tax-exempt special facilities revenue bonds
Commitments and Contingencies [Line Items]
Guarantor obligations, maximum exposure | $	$ 2,000
Operating leases obligations | $	1,500
Capital leases obligations | $	294
Floating Rate Debt
Commitments and Contingencies [Line Items]
Debt instrument principal amount | $	2,200
Fixed Rate Debt
Commitments and Contingencies [Line Items]
Debt instrument principal amount | $	130
Loans And Leases From Non U S Entities
Commitments and Contingencies [Line Items]
Debt instrument principal amount | $	$ 2,300
Maximum
Commitments and Contingencies [Line Items]
Debt instrument, remaining terms (years)	12 years
Maximum | Tax-exempt special facilities revenue bonds
Commitments and Contingencies [Line Items]
Debt instrument maturity year	2038
Maximum | Loans And Leases From Non U S Entities
Commitments and Contingencies [Line Items]
Debt instrument, remaining terms (years)	12 years
Minimum | Tax-exempt special facilities revenue bonds
Commitments and Contingencies [Line Items]
Debt instrument maturity year	2015
United Airlines, Inc.
Commitments and Contingencies [Line Items]
Number of employees | Employee	84
Percentage of employees represented by various U.S. labor organizations	80.00%
Capital Addition Purchase Commitments | Embraer E175 aircraft
Commitments and Contingencies [Line Items]
New aircraft, scheduled delivery date	2016
Number of aircraft expected to be delivered	10
Capital Addition Purchase Commitments | Embraer E175 aircraft | Subsequent Event
Commitments and Contingencies [Line Items]
Number of additional aircraft under exercise of options expected to be delivered		5
Capital Addition Purchase Commitments | AerCap Holdings N.V. | A319 aircraft
Commitments and Contingencies [Line Items]
Number of used aircraft expected to be delivered over the next two years beginning in early 2016	11
Capital Addition Purchase Commitments | AerCap Holdings N.V. | Maximum | A319 aircraft
Commitments and Contingencies [Line Items]
Number of used aircraft expected to be delivered over the next five years	14
Capital Addition Purchase Commitments | United Airlines, Inc.
Commitments and Contingencies [Line Items]
New aircraft, scheduled delivery date	2024
Capital Addition Purchase Commitments | United Airlines, Inc. | B-737 NG [Member]
Commitments and Contingencies [Line Items]
Number of aircraft expected to be delivered	8
Capital Addition Purchase Commitments | United Airlines, Inc. | Boeing 787-9
Commitments and Contingencies [Line Items]
Number of aircraft expected to be delivered	7
Capital Addition Purchase Commitments | United Airlines, Inc. | Embraer E175 aircraft
Commitments and Contingencies [Line Items]
Number of aircraft under financing arrangement expected to be delivered	4
Capital Addition Purchase Commitments | United Airlines, Inc. | Boeing 737-900ER aircraft
Commitments and Contingencies [Line Items]
Number of aircraft under financing arrangement expected to be delivered	2