Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (AOCI) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
AOCI tax, attributable to parent [Roll Forward]
Beginning balance, tax	$ (1,512)	$ (1,601)
Other comprehensive income (loss) before reclassifications, tax	(74)	108
Amounts reclassified from AOCI, tax	(20)	(19)
Net current-period other comprehensive income (loss), tax	(94)	89
Ending balance, tax	(1,606)	(1,512)	$ (1,601)
AOCI attributable to parent, net of tax [Roll Forward]
Beginning Balance	(5,202)	(5,799)	(7,340)
Other comprehensive income (loss) before reclassifications, net of tax	261	(374)
Amounts reclassified from AOCI, net of tax	68	65
Total other comprehensive income (loss), net of tax	329	(309)	1,357
Ending Balance	(3,977)	(5,202)	(5,799)
Accumulated Other Comprehensive Loss
AOCI attributable to parent, net of tax [Roll Forward]
Beginning Balance	(4,894)	(4,585)	(5,942)
Total other comprehensive income (loss), net of tax	329	(309)	1,357
Ending Balance	(4,565)	(4,894)	(4,585)
Pension, Retiree Medical and Other Postretirement Benefits
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(3,380)	(2,978)
Other comprehensive income (loss) before reclassifications, before tax	333	(486)
Amounts reclassified from AOCI, before tax	88	84
Net current-period other comprehensive income (loss), before tax	421	(402)
Ending balance, before tax	(2,959)	(3,380)	(2,978)
Unrealized Gain (Loss) on Investments
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(2)	(6)
Other comprehensive income (loss) before reclassifications, before tax	2	4
Amounts reclassified from AOCI, before tax	0	0
Net current-period other comprehensive income (loss), before tax	2	4
Ending balance, before tax	0	(2)	(6)
American Airlines, Inc.
AOCI tax, attributable to parent [Roll Forward]
Beginning balance, tax	(1,621)	(1,710)
Other comprehensive income (loss) before reclassifications, tax	(74)	108
Amounts reclassified from AOCI, tax	(20)	(19)
Net current-period other comprehensive income (loss), tax	(94)	89
Ending balance, tax	(1,715)	(1,621)	(1,710)
AOCI attributable to parent, net of tax [Roll Forward]
Beginning Balance	6,577	5,593	3,826
Other comprehensive income (loss) before reclassifications, net of tax	254	(374)
Amounts reclassified from AOCI, net of tax	68	65
Total other comprehensive income (loss), net of tax	322	(309)	1,351
Ending Balance	8,234	6,577	5,593
American Airlines, Inc. | Accumulated Other Comprehensive Loss
AOCI attributable to parent, net of tax [Roll Forward]
Beginning Balance	(4,999)	(4,690)	(6,041)
Total other comprehensive income (loss), net of tax	322	(309)	1,351
Ending Balance	(4,677)	(4,999)	(4,690)
American Airlines, Inc. | Pension, Retiree Medical and Other Postretirement Benefits
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(3,376)	(2,974)
Other comprehensive income (loss) before reclassifications, before tax	326	(486)
Amounts reclassified from AOCI, before tax	88	84
Net current-period other comprehensive income (loss), before tax	414	(402)
Ending balance, before tax	(2,962)	(3,376)	(2,974)
American Airlines, Inc. | Unrealized Gain (Loss) on Investments
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(2)	(6)
Other comprehensive income (loss) before reclassifications, before tax	2	4
Amounts reclassified from AOCI, before tax	0	0
Net current-period other comprehensive income (loss), before tax	2	4
Ending balance, before tax	$ 0	$ (2)	$ (6)