Debt - Schedule of Line of Credit (Details) $ in Millions	Sep. 30, 2020 USD ($)
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	$ 5,327
American Airlines, Inc.
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	5,327
Treasury Term Loan Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	4,927
Treasury Term Loan Facility | American Airlines, Inc.
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	4,927
Other Short-term Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	400
Other Short-term Revolving Facility | American Airlines, Inc.
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	$ 400