Debt - Components of Long-Term Debt - Other Equipment Notes Issued in 2018 (Details) $ in Billions	9 Months Ended
	Sep. 30, 2018 USD ($)
Debt Instrument [Line Items]
Proceeds from notes payable	$ 1.3
Secured Debt [Member] | Equipment Loans and Other Notes Payable Issued in 2018 [Member]
Debt Instrument [Line Items]
Average interest rate	4.09%
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Proceeds from notes payable	$ 1.3
American Airlines, Inc. [Member] | Secured Debt [Member] | Equipment Loans and Other Notes Payable Issued in 2018 [Member]
Debt Instrument [Line Items]
Average interest rate	4.09%