Income Taxes - Reconciliation of Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Statutory income tax provision (benefit)	$ (2,405)	$ 474	$ 396
State income tax provision (benefit), net of federal tax effect	(183)	47	44
Book expenses not deductible for tax purposes	22	31	12
Foreign income taxes, net of federal tax effect	0	8	23
Change in valuation allowance	0	4	(6)
Other, net	(2)	6	3
Total income tax provision (benefit)	(2,568)	570	472
American Airlines, Inc.
Income Tax Disclosure [Line Items]
Statutory income tax provision (benefit)	(2,290)	547	460
State income tax provision (benefit), net of federal tax effect	(181)	41	46
Book expenses not deductible for tax purposes	20	29	10
Foreign income taxes, net of federal tax effect	0	8	22
Change in valuation allowance	0	5	(6)
Other, net	(2)	3	2
Total income tax provision (benefit)	$ (2,453)	$ 633	$ 534