Debt - Components of Long-Term Debt - 2014 Credit Facilities (Details) - Secured Debt [Member] - 2014 Credit Facilities [Member] - Term Loan Facility [Member]	Sep. 30, 2018 USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, incremental loan feature	$ 500,000,000
Long-term debt, net	1,200,000,000
American Airlines, Inc. [Member]
Line of Credit Facility [Line Items]
Line of credit facility, incremental loan feature	500,000,000
Long-term debt, net	$ 1,200,000,000