Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 1
Interest cost	190	139
Expected return on assets	(229)	(285)
Amortization of:
Prior service cost (benefit)	7	7
Unrecognized net loss (gain)	27	38
Net periodic benefit income	(5)	(100)
Retiree Medical and Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3
Interest cost	12	7
Expected return on assets	(3)	(3)
Amortization of:
Prior service cost (benefit)	(3)	(3)
Unrecognized net loss (gain)	(9)	(6)
Net periodic benefit income	0	(2)
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1
Interest cost	189	138
Expected return on assets	(228)	(283)
Amortization of:
Prior service cost (benefit)	7	7
Unrecognized net loss (gain)	27	38
Net periodic benefit income	(5)	(99)
American Airlines, Inc. | Retiree Medical and Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3
Interest cost	12	7
Expected return on assets	(3)	(3)
Amortization of:
Prior service cost (benefit)	(3)	(3)
Unrecognized net loss (gain)	(9)	(6)
Net periodic benefit income	$ 0	$ (2)