Accumulated Other Comprehensive Loss - Reclassifications out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other income (expense), net	$ 297		$ 356		$ 675	$ 776
Total reclassifications for the period, net of tax	(599)	$ 473	(717)	$ 312	(126)	(405)
American Airlines, Inc.
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other income (expense), net	157		234		418	533
Total reclassifications for the period, net of tax	(718)	$ 384	(793)	$ 216	(334)	(577)
Amounts reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	17		19		35	37
Amounts reclassified from AOCI | American Airlines, Inc.
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	17		19		35	37
Amounts reclassified from AOCI | Prior service cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other income (expense), net	3		3		7	5
Amounts reclassified from AOCI | Prior service cost | American Airlines, Inc.
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other income (expense), net	3		3		7	5
Amounts reclassified from AOCI | Actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other income (expense), net	14		16		28	32
Amounts reclassified from AOCI | Actuarial loss | American Airlines, Inc.
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other income (expense), net	$ 14		$ 16		$ 28	$ 32