Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Operating loss carryforwards	$ 2,103	$ 2,343
Leases	2,077	2,189
Loyalty program liability	1,755	1,770
Pensions	1,229	1,430
Postretirement benefits other than pensions	145	145
Rent expense	126	136
Alternative minimum tax (AMT) credit carryforwards	90	175
Reorganization items	30	33
Other	613	631
Total deferred tax assets	8,168	8,852
Valuation allowance	(34)	(30)
Net deferred tax assets	8,134	8,822
Deferred tax liabilities:
Accelerated depreciation and amortization	(5,196)	(5,280)
Leases	(1,979)	(2,081)
Other	(343)	(326)
Total deferred tax liabilities	(7,518)	(7,687)
Net deferred tax asset	616	1,135
American Airlines, Inc. [Member]
Deferred tax assets:
Operating loss carryforwards	2,115	2,420
Leases	2,067	2,176
Loyalty program liability	1,755	1,770
Pensions	1,219	1,421
Postretirement benefits other than pensions	145	145
Rent expense	126	136
Alternative minimum tax (AMT) credit carryforwards	118	231
Reorganization items	30	33
Other	569	588
Total deferred tax assets	8,144	8,920
Valuation allowance	(24)	(19)
Net deferred tax assets	8,120	8,901
Deferred tax liabilities:
Accelerated depreciation and amortization	(5,153)	(5,243)
Leases	(1,968)	(2,068)
Other	(340)	(321)
Total deferred tax liabilities	(7,461)	(7,632)
Net deferred tax asset	$ 659	$ 1,269