Accumulated Other Comprehensive Loss - Reclassifications out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other expense, net	$ 420	$ 421
Total reclassifications for the period, net of tax	312	(10)
American Airlines, Inc.
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other expense, net	299	325
Total reclassifications for the period, net of tax	216	(85)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	19	17
Reclassification out of Accumulated Other Comprehensive Income | American Airlines, Inc.
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	19	17
Reclassification out of Accumulated Other Comprehensive Income | Prior service cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other expense, net	3	3
Reclassification out of Accumulated Other Comprehensive Income | Prior service cost | American Airlines, Inc.
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other expense, net	3	3
Reclassification out of Accumulated Other Comprehensive Income | Actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other expense, net	16	14
Reclassification out of Accumulated Other Comprehensive Income | Actuarial loss | American Airlines, Inc.
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other expense, net	$ 16	$ 14