Debt - Schedule of Line of Credit (Details) $ in Millions	Sep. 30, 2021 USD ($)
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	$ 3,413
American Airlines, Inc.
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	3,413
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	2,800
Revolving Credit Facility | 2013 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	750
Revolving Credit Facility | 2014 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	1,643
Revolving Credit Facility | April 2016 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	450
Revolving Credit Facility | Short-term Revolving and Other Facilities
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	570
Revolving Credit Facility | American Airlines, Inc.
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	2,800
Revolving Credit Facility | American Airlines, Inc. | 2013 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	750
Revolving Credit Facility | American Airlines, Inc. | 2014 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	1,643
Revolving Credit Facility | American Airlines, Inc. | April 2016 Revolving Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	450
Revolving Credit Facility | American Airlines, Inc. | Short-term Revolving and Other Facilities
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	$ 570