Employee Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 1	$ 1	$ 2
Interest cost	190	139	380	277
Expected return on assets	(229)	(285)	(459)	(569)
Amortization of:
Prior service cost (benefit)	7	7	14	14
Unrecognized net loss (gain)	27	38	54	77
Net periodic benefit cost (income)	(5)	(100)	(10)	(199)
Retiree Medical and Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	6	7
Interest cost	12	7	24	15
Expected return on assets	(3)	(3)	(5)	(6)
Amortization of:
Prior service cost (benefit)	(3)	(3)	(6)	(7)
Unrecognized net loss (gain)	(9)	(6)	(18)	(12)
Net periodic benefit cost (income)	0	(2)	1	(3)
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1	1	2
Interest cost	189	138	378	275
Expected return on assets	(228)	(283)	(457)	(567)
Amortization of:
Prior service cost (benefit)	7	7	14	14
Unrecognized net loss (gain)	27	38	54	77
Net periodic benefit cost (income)	(5)	(99)	(10)	(199)
American Airlines, Inc. | Retiree Medical and Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	6	7
Interest cost	12	7	24	15
Expected return on assets	(3)	(3)	(5)	(6)
Amortization of:
Prior service cost (benefit)	(3)	(3)	(6)	(7)
Unrecognized net loss (gain)	(9)	(6)	(18)	(12)
Net periodic benefit cost (income)	$ 0	$ (2)	$ 1	$ (3)