Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (AOCI) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
AOCI tax, attributable to parent [Roll Forward]
Beginning balance, tax	$ (1,606)	$ (1,512)
Other comprehensive income (loss) before reclassifications, tax	(33)	(74)
Amounts reclassified from AOCI, tax	(18)	(20)
Net current-period other comprehensive income (loss), tax	(51)	(94)
Ending balance, tax	(1,657)	(1,606)	$ (1,512)
AOCI attributable to parent, net of tax [Roll Forward]
Beginning Balance	(3,977)	(5,202)	(5,799)
Other comprehensive income (loss) before reclassifications, net of tax	112	261
Amounts reclassified from AOCI, net of tax	64	68
Total other comprehensive income (loss), net of tax	176	329	(309)
Ending Balance	(3,727)	(3,977)	(5,202)
Accumulated Other Comprehensive Loss
AOCI attributable to parent, net of tax [Roll Forward]
Beginning Balance	(4,565)	(4,894)	(4,585)
Total other comprehensive income (loss), net of tax	176	329	(309)
Ending Balance	(4,389)	(4,565)	(4,894)
Pension, Retiree Medical and Other Postretirement Benefits
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(2,959)	(3,380)
Other comprehensive income (loss) before reclassifications, before tax	145	333
Amounts reclassified from AOCI, before tax	82	88
Net current-period other comprehensive income (loss), before tax	227	421
Ending balance, before tax	(2,732)	(2,959)	(3,380)
Unrealized Gain (Loss) on Investments
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	0	(2)
Other comprehensive income (loss) before reclassifications, before tax	0	2
Amounts reclassified from AOCI, before tax	0	0
Net current-period other comprehensive income (loss), before tax	0	2
Ending balance, before tax	0	0	(2)
American Airlines, Inc.
AOCI tax, attributable to parent [Roll Forward]
Beginning balance, tax	(1,715)	(1,621)
Other comprehensive income (loss) before reclassifications, tax	(32)	(74)
Amounts reclassified from AOCI, tax	(18)	(20)
Net current-period other comprehensive income (loss), tax	(50)	(94)
Ending balance, tax	(1,765)	(1,715)	(1,621)
AOCI attributable to parent, net of tax [Roll Forward]
Beginning Balance	8,234	6,577	5,593
Other comprehensive income (loss) before reclassifications, net of tax	106	254
Amounts reclassified from AOCI, net of tax	64	68
Total other comprehensive income (loss), net of tax	170	322	(309)
Ending Balance	9,028	8,234	6,577
American Airlines, Inc. | Accumulated Other Comprehensive Loss
AOCI attributable to parent, net of tax [Roll Forward]
Beginning Balance	(4,677)	(4,999)	(4,690)
Total other comprehensive income (loss), net of tax	170	322	(309)
Ending Balance	(4,507)	(4,677)	(4,999)
American Airlines, Inc. | Pension, Retiree Medical and Other Postretirement Benefits
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(2,962)	(3,376)
Other comprehensive income (loss) before reclassifications, before tax	138	326
Amounts reclassified from AOCI, before tax	82	88
Net current-period other comprehensive income (loss), before tax	220	414
Ending balance, before tax	(2,742)	(2,962)	(3,376)
American Airlines, Inc. | Unrealized Gain (Loss) on Investments
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	0	(2)
Other comprehensive income (loss) before reclassifications, before tax	0	2
Amounts reclassified from AOCI, before tax	0	0
Net current-period other comprehensive income (loss), before tax	0	2
Ending balance, before tax	$ 0	$ 0	$ (2)