Debt - Components of Long-Term Debt - Equipment Loans and Other Notes Payable Issued in 2016 (Detail) - Secured Debt [Member] - Equipment Loans and Other Notes Payable [Member] $ in Billions	12 Months Ended
	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Proceeds from notes payable	$ 1.0
LIBOR [Member]
Debt Instrument [Line Items]
Long-term debt average interest rate	3.08%
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Proceeds from notes payable	$ 1.0
American Airlines, Inc. [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Long-term debt average interest rate	3.08%