Accumulated Other Comprehensive Loss - Reclassifications out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other income (expense), net	$ 293			$ 345			$ 967	$ 1,121
Total reclassifications for the period, net of tax	114	$ (599)	$ 473	149	$ (717)	$ 312	(12)	(256)
American Airlines, Inc.
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other income (expense), net	152			219			570	752
Total reclassifications for the period, net of tax	(10)	$ (718)	$ 384	41	$ (793)	$ 216	(344)	(536)
Amounts reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	15			18			50	55
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	15			18			50	55
Amounts reclassified from AOCI | Prior service cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other income (expense), net	3			3			10	9
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			10	9
Amounts reclassified from AOCI | Actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other income (expense), net	12			15			40	46
Amounts reclassified from AOCI | Actuarial loss | American Airlines, Inc.
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating other income (expense), net	$ 12			$ 15			$ 40	$ 46