Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1
Interest cost	139	131
Expected return on assets	(285)	(272)
Special termination benefits	0	0
Amortization of:
Prior service cost (benefit)	7	7
Unrecognized net loss (gain)	38	53
Net periodic benefit cost (income)	(100)	(80)
Retiree Medical and Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	2
Interest cost	7	6
Expected return on assets	(3)	(3)
Special termination benefits	0	139
Amortization of:
Prior service cost (benefit)	(3)	(3)
Unrecognized net loss (gain)	(6)	(6)
Net periodic benefit cost (income)	(2)	135
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	138	130
Expected return on assets	(283)	(270)
Special termination benefits	0	0
Amortization of:
Prior service cost (benefit)	7	7
Unrecognized net loss (gain)	38	52
Net periodic benefit cost (income)	(99)	(80)
American Airlines, Inc. | Retiree Medical and Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	2
Interest cost	7	6
Expected return on assets	(3)	(3)
Special termination benefits	0	139
Amortization of:
Prior service cost (benefit)	(3)	(3)
Unrecognized net loss (gain)	(6)	(6)
Net periodic benefit cost (income)	$ (2)	$ 135