Income Taxes - Reconciliation of Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Line Items]
Statutory income tax provision	$ 474	$ 396	$ 1,188
State income tax provision, net of federal tax effect	47	44	59
Book expenses not deductible for tax purposes	31	12	33
Foreign income taxes, net of federal tax effect	8	23	7
Change in valuation allowance	4	(6)	(3)
2017 Tax Act	0	0	823
Other, net	6	3	6
Total income tax provision	570	472	2,113
American Airlines, Inc. [Member]
Income Tax Disclosure [Line Items]
Statutory income tax provision	547	460	1,244
State income tax provision, net of federal tax effect	41	46	53
Book expenses not deductible for tax purposes	29	10	30
Foreign income taxes, net of federal tax effect	8	22	6
Change in valuation allowance	5	(6)	4
2017 Tax Act	0	0	924
Other, net	3	2	9
Total income tax provision	$ 633	$ 534	$ 2,270