Debt - Components of Long-Term Debt - 2017 Enhanced Equipment Trust Certificates (Detail) - Enhanced Equipment Trust Certificates (EETC) [Member] $ in Millions	1 Months Ended		9 Months Ended
	Aug. 31, 2017 USD ($) Aircraft Debt_Instruments	Jan. 31, 2017 USD ($) Aircraft Debt_Instruments	Sep. 30, 2017 USD ($)
2017-2 EETC [Member]
Debt Instrument [Line Items]
Number of pass-through trusts issued | Debt_Instruments	2
Debt instrument principal amount	$ 797
Number of aircraft financed by debt issuance | Aircraft	30
Debt instrument, escrowed proceeds used to purchase notes			$ 253
2017-1 EETC [Member]
Debt Instrument [Line Items]
Number of pass-through trusts issued | Debt_Instruments		3
Debt instrument principal amount		$ 983
Number of aircraft financed by debt issuance | Aircraft		24
American Airlines, Inc. [Member] | 2017-2 EETC [Member]
Debt Instrument [Line Items]
Number of pass-through trusts issued | Debt_Instruments	2
Debt instrument principal amount	$ 797
Number of aircraft financed by debt issuance | Aircraft	30
Debt instrument, escrowed proceeds used to purchase notes			$ 253
American Airlines, Inc. [Member] | 2017-1 EETC [Member]
Debt Instrument [Line Items]
Number of pass-through trusts issued | Debt_Instruments		3
Debt instrument principal amount		$ 983
Number of aircraft financed by debt issuance | Aircraft		24