Leases - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) aircraft	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease cost | $	$ 2,016	$ 2,007	$ 2,012
Leased Aircrafts
Lessee, Lease, Description [Line Items]
Number of operated aircrafts	737
Aircrafts in Temporary Storage
Lessee, Lease, Description [Line Items]
Number of operated aircrafts	7
Aircrafts Leased Under Capacity Purchase Agreements
Lessee, Lease, Description [Line Items]
Number of operated aircrafts	237
Boeing 787 | Operating Lease Commitments
Lessee, Lease, Description [Line Items]
Operating lease commitments that have not yet commenced | $	$ 669
Operating lease commitments that have not yet commenced, number of aircraft	5
Operating lease commitments that have not yet commenced, lease term	10 years
Republic Holdings
Lessee, Lease, Description [Line Items]
Ownership Interest	25.00%
Republic Holdings
Lessee, Lease, Description [Line Items]
Operating lease cost | $	$ 274	242	190
American Airlines, Inc.
Lessee, Lease, Description [Line Items]
Operating lease cost | $	$ 1,992	1,987	1,998
American Airlines, Inc. | Leased Aircrafts
Lessee, Lease, Description [Line Items]
Number of operated aircrafts	737
American Airlines, Inc. | Aircrafts in Temporary Storage
Lessee, Lease, Description [Line Items]
Number of operated aircrafts	7
American Airlines, Inc. | Aircrafts Leased Under Capacity Purchase Agreements
Lessee, Lease, Description [Line Items]
Number of operated aircrafts	237
American Airlines, Inc. | Boeing 787 | Operating Lease Commitments
Lessee, Lease, Description [Line Items]
Operating lease commitments that have not yet commenced | $	$ 669
Operating lease commitments that have not yet commenced, number of aircraft	5
Operating lease commitments that have not yet commenced, lease term	10 years
American Airlines, Inc. | Republic Holdings
Lessee, Lease, Description [Line Items]
Ownership Interest	25.00%
American Airlines, Inc. | Republic Holdings
Lessee, Lease, Description [Line Items]
Operating lease cost | $	$ 274	$ 242	$ 190
Minimum
Lessee, Lease, Description [Line Items]
Lease terms	1 year
Minimum | American Airlines, Inc.
Lessee, Lease, Description [Line Items]
Lease terms	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease terms	10 years
Maximum | American Airlines, Inc.
Lessee, Lease, Description [Line Items]
Lease terms	10 years