Debt - Summary of Availability under Revolving Credit Facilities (Details) - Revolving Credit Facility [Member] - Secured Debt [Member] $ in Millions	Mar. 31, 2020 USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, remaining borrowing capacity	$ 3,200
2013 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, remaining borrowing capacity	750
2014 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, remaining borrowing capacity	1,643
April 2016 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, remaining borrowing capacity	450
Other Short-term Revolving Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, remaining borrowing capacity	400
American Airlines, Inc. [Member]
Line of Credit Facility [Line Items]
Line of credit facility, remaining borrowing capacity	3,243
American Airlines, Inc. [Member] | 2013 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, remaining borrowing capacity	750
American Airlines, Inc. [Member] | 2014 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, remaining borrowing capacity	1,643
American Airlines, Inc. [Member] | April 2016 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, remaining borrowing capacity	450
American Airlines, Inc. [Member] | Other Short-term Revolving Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, remaining borrowing capacity	$ 400