Employee Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1	$ 2	$ 3
Interest cost	188	140	568	416
Expected return on assets	(230)	(284)	(690)	(853)
Amortization of:
Prior service cost (benefit)	4	7	18	21
Unrecognized net loss (gain)	25	39	80	117
Net periodic benefit cost (income)	(12)	(97)	(22)	(296)
Pension Benefits | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1	1	2
Interest cost	187	139	564	414
Expected return on assets	(228)	(283)	(685)	(850)
Amortization of:
Prior service cost (benefit)	4	7	18	21
Unrecognized net loss (gain)	25	39	80	117
Net periodic benefit cost (income)	(12)	(97)	(22)	(296)
Retiree Medical and Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	3	10	11
Interest cost	12	7	36	22
Expected return on assets	(2)	(3)	(7)	(9)
Amortization of:
Prior service cost (benefit)	(3)	(3)	(10)	(10)
Unrecognized net loss (gain)	(10)	(6)	(27)	(19)
Net periodic benefit cost (income)	1	(2)	2	(5)
Retiree Medical and Other Postretirement Benefits | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	3	10	11
Interest cost	12	7	36	22
Expected return on assets	(2)	(3)	(7)	(9)
Amortization of:
Prior service cost (benefit)	(3)	(3)	(10)	(10)
Unrecognized net loss (gain)	(10)	(6)	(27)	(19)
Net periodic benefit cost (income)	$ 1	$ (2)	$ 2	$ (5)