Debt - Details of 2016-3 Enhanced Equipment Trust Certificates (Detail) - Enhanced Equipment Trust Certificates (EETC) [Member] $ in Millions	Sep. 30, 2017 USD ($)
Series 2016-3 Class AA [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal issued	$ 558
Debt instrument, stated interest rate percentage	3.00%
Series 2016-3 Class A [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal issued	$ 256
Debt instrument, stated interest rate percentage	3.25%
American Airlines, Inc. [Member] | Series 2016-3 Class AA [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal issued	$ 558
Debt instrument, stated interest rate percentage	3.00%
American Airlines, Inc. [Member] | Series 2016-3 Class A [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal issued	$ 256
Debt instrument, stated interest rate percentage	3.25%