Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Retiree Medical and Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Increase in postretirement benefit obligation	$ 339
Retiree Medical and Other Postretirement Benefits | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Increase in postretirement benefit obligation	$ 339
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, contributed amount		$ 68
Pension Benefits | American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, contributed amount		$ 67