Debt - Components of Long-Term Debt - Guarantees (Detail)	Dec. 31, 2017 USD ($)
Secured Debt [Member] | Special Facility Revenue Bonds [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 810,000,000
Secured Debt [Member] | Credit Facilities And Certain EETC Financings [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	8,500,000,000
American Airlines, Inc. [Member] | Unsecured Debt [Member] | Senior Notes 6.125% Due in 2018 [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	500,000,000
American Airlines, Inc. [Member] | Unsecured Debt [Member] | Senior Notes 5.50% Due in 2019 [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	750,000,000
American Airlines, Inc. [Member] | Unsecured Debt [Member] | Senior Notes 4.625% Due in 2020 [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 500,000,000