Debt - Summary of Availability under Revolving Credit Facilities (Details) - Revolving Credit Facility [Member] - Secured Debt [Member]	Mar. 31, 2019 USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 2,843,000,000
2013 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,000,000,000
2014 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,543,000,000
April 2016 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	300,000,000
American Airlines, Inc. [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	2,843,000,000
American Airlines, Inc. [Member] | 2013 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,000,000,000
American Airlines, Inc. [Member] | 2014 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,543,000,000
American Airlines, Inc. [Member] | April 2016 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 300,000,000