Leases - Additional Information (Details) $ in Millions		12 Months Ended
	Dec. 31, 2018 USD ($) Aircraft	Dec. 31, 2018 USD ($) Aircraft	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Lessee, Lease, Description [Line Items]
Number of leased aircraft | Aircraft	660	660
Operating lease cost		$ 1,907
Operating lease commitments that have not yet commenced	$ 1,900	$ 1,900
Operating lease commitments that have not yet commenced, number of aircraft | Aircraft	22	22
Operating lease commitments that have not yet commenced, lease term	10 years	10 years
Operating lease rent expense			$ 3,200	$ 3,200
Republic Holdings [Member]
Lessee, Lease, Description [Line Items]
Ownership interest	25.00%	25.00%
Republic [Member]
Lessee, Lease, Description [Line Items]
Operating lease cost		$ 226
American Airlines, Inc. [Member]
Lessee, Lease, Description [Line Items]
Number of leased aircraft | Aircraft	660	660
Operating lease cost		$ 1,889
Operating lease commitments that have not yet commenced	$ 1,900	$ 1,900
Operating lease commitments that have not yet commenced, number of aircraft | Aircraft	22	22
Operating lease commitments that have not yet commenced, lease term	10 years	10 years
Operating lease rent expense			$ 3,200	$ 3,100
American Airlines, Inc. [Member] | Republic Holdings [Member]
Lessee, Lease, Description [Line Items]
Ownership interest	25.00%	25.00%
American Airlines, Inc. [Member] | Republic [Member]
Lessee, Lease, Description [Line Items]
Operating lease cost		$ 226
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lease terms	1 year
Minimum [Member] | American Airlines, Inc. [Member]
Lessee, Lease, Description [Line Items]
Lease terms	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lease terms	12 years
Maximum [Member] | American Airlines, Inc. [Member]
Lessee, Lease, Description [Line Items]
Lease terms	12 years