Debt - Summary of Availability under Revolving Credit Facilities (Detail) - Revolving Credit Facility [Member] - Secured Debt [Member] $ in Millions	Jun. 30, 2017 USD ($)
Line of Credit Facility [Line Items]
Availability under revolving credit facilities	$ 2,425
2013 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Availability under revolving credit facilities	1,400
2014 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Availability under revolving credit facilities	1,025
American Airlines, Inc. [Member]
Line of Credit Facility [Line Items]
Availability under revolving credit facilities	2,425
American Airlines, Inc. [Member] | 2013 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Availability under revolving credit facilities	1,400
American Airlines, Inc. [Member] | 2014 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Availability under revolving credit facilities	$ 1,025