Employee Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 1	$ 1
Interest cost	181	190	362	380
Expected return on assets	(244)	(229)	(489)	(459)
Amortization of:
Prior service cost (benefit)	0	7	0	14
Unrecognized net loss (gain)	27	27	54	54
Net periodic benefit cost (income)	(36)	(5)	(72)	(10)
Pension Benefits | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	1	1
Interest cost	180	189	360	378
Expected return on assets	(243)	(228)	(487)	(457)
Amortization of:
Prior service cost (benefit)	0	7	0	14
Unrecognized net loss (gain)	27	27	54	54
Net periodic benefit cost (income)	(36)	(5)	(72)	(10)
Retiree Medical and Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	3	16	6
Interest cost	17	12	34	24
Expected return on assets	(2)	(3)	(5)	(5)
Amortization of:
Prior service cost (benefit)	3	(3)	7	(6)
Unrecognized net loss (gain)	(6)	(9)	(13)	(18)
Net periodic benefit cost (income)	20	0	39	1
Retiree Medical and Other Postretirement Benefits | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	3	16	6
Interest cost	17	12	34	24
Expected return on assets	(2)	(3)	(5)	(5)
Amortization of:
Prior service cost (benefit)	3	(3)	7	(6)
Unrecognized net loss (gain)	(6)	(9)	(13)	(18)
Net periodic benefit cost (income)	$ 20	$ 0	$ 39	$ 1