Debt - Summary of Availability under Revolving Credit Facilities (Details) - Revolving Credit Facility [Member] - USD ($) $ in Millions	Dec. 31, 2019	Nov. 30, 2019	Oct. 31, 2019
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 3,243
2013 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	750
2014 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,643
April 2016 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	450
Other Short-term Revolving Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	400
Secured Debt [Member] | 2013 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	750	$ 750	$ 1,000
Secured Debt [Member] | 2014 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,643	1,600	1,500
Secured Debt [Member] | April 2016 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	450	450	300
American Airlines, Inc. [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	3,243
American Airlines, Inc. [Member] | 2013 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	750
American Airlines, Inc. [Member] | 2014 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,643
American Airlines, Inc. [Member] | April 2016 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	450
American Airlines, Inc. [Member] | Other Short-term Revolving Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 400
American Airlines, Inc. [Member] | Secured Debt [Member] | 2013 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		750	1,000
American Airlines, Inc. [Member] | Secured Debt [Member] | 2014 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		1,600	1,500
American Airlines, Inc. [Member] | Secured Debt [Member] | April 2016 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 450	$ 300