Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Net operating loss and other carryforwards	$ 4,238	$ 4,679
Loyalty program liability	1,774	1,809
Leases	1,758	1,819
Pension benefits	434	474
Postretirement benefits other than pension benefits	274	179
Rent expense	84	130
Other	902	742
Total deferred tax assets	9,464	9,832
Valuation allowance	(22)	(19)
Net deferred tax assets	9,442	9,813
Deferred tax liabilities:
Accelerated depreciation and amortization	(4,503)	(4,630)
Leases	(1,798)	(1,832)
Other	(262)	(262)
Total deferred tax liabilities	(6,563)	(6,724)
Net deferred tax asset	2,879	3,089
American Airlines, Inc.
Deferred tax assets:
Net operating loss and other carryforwards	3,960	4,492
Loyalty program liability	1,774	1,809
Leases	1,746	1,804
Pension benefits	428	467
Postretirement benefits other than pension benefits	273	179
Rent expense	84	130
Other	846	689
Total deferred tax assets	9,111	9,570
Valuation allowance	(12)	(9)
Net deferred tax assets	9,099	9,561
Deferred tax liabilities:
Accelerated depreciation and amortization	(4,479)	(4,603)
Leases	(1,786)	(1,817)
Other	(254)	(256)
Total deferred tax liabilities	(6,519)	(6,676)
Net deferred tax asset	$ 2,580	$ 2,885