Employee Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	181	190
Expected return on assets	(244)	(229)
Amortization of:
Prior service cost (benefit)	0	7
Unrecognized net loss (gain)	27	27
Net periodic benefit cost (income)	(36)	(5)
Pension Benefits | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	180	189
Expected return on assets	(243)	(228)
Amortization of:
Prior service cost (benefit)	0	7
Unrecognized net loss (gain)	27	27
Net periodic benefit cost (income)	(36)	(5)
Retiree Medical and Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	3
Interest cost	17	12
Expected return on assets	(2)	(3)
Amortization of:
Prior service cost (benefit)	3	(3)
Unrecognized net loss (gain)	(6)	(9)
Net periodic benefit cost (income)	20	0
Retiree Medical and Other Postretirement Benefits | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	3
Interest cost	17	12
Expected return on assets	(2)	(3)
Amortization of:
Prior service cost (benefit)	3	(3)
Unrecognized net loss (gain)	(6)	(9)
Net periodic benefit cost (income)	$ 20	$ 0