Condensed Consolidated Statements of Stockholder's Equity - American Airlines, Inc. - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Deficit	American Airlines, Inc.	American Airlines, Inc. Common Stock	American Airlines, Inc. Additional Paid-in Capital	American Airlines, Inc. Accumulated Other Comprehensive Loss	American Airlines, Inc. Retained Deficit
Beginning balance at Dec. 31, 2023	$ (5,202)	$ 7	$ 7,374	$ (4,894)	$ (7,689)	$ 6,577	$ 0	$ 17,335	$ (4,999)	$ (5,759)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(312)				(312)	(216)				(216)
Other comprehensive income, net	17			17		17			17
Share-based compensation expense	28		28			27		27
Modification of share-based awards	(20)		(20)			(20)		(20)
Intercompany equity transfer						1		1
Ending balance at Mar. 31, 2024	(5,500)	7	7,371	(4,877)	(8,001)	6,386	0	17,343	(4,982)	(5,975)
Beginning balance at Dec. 31, 2023	(5,202)	7	7,374	(4,894)	(7,689)	6,577	0	17,335	(4,999)	(5,759)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	256					536
Other comprehensive income, net	59					59
Ending balance at Sep. 30, 2024	(4,854)	7	7,407	(4,835)	(7,433)	7,223	0	17,386	(4,940)	(5,223)
Beginning balance at Mar. 31, 2024	(5,500)	7	7,371	(4,877)	(8,001)	6,386	0	17,343	(4,982)	(5,975)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	717				717	793				793
Other comprehensive income, net	19			19		19			19
Share-based compensation expense	21		21			20		20
Intercompany equity transfer						1		1
Ending balance at Jun. 30, 2024	(4,746)	7	7,389	(4,858)	(7,284)	7,219	0	17,364	(4,963)	(5,182)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(149)				(149)	(41)				(41)
Other comprehensive income, net	23			23		23			23
Share-based compensation expense	22		22			21		21
Intercompany equity transfer						1		1
Ending balance at Sep. 30, 2024	(4,854)	7	7,407	(4,835)	(7,433)	7,223	0	17,386	(4,940)	(5,223)
Beginning balance at Dec. 31, 2024	(3,977)	7	7,424	(4,565)	(6,843)	8,234	0	17,408	(4,677)	(4,497)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(473)				(473)	(384)				(384)
Other comprehensive income, net	18			18		18			18
Share-based compensation expense	16		16			15		15
Intercompany equity transfer						1		1
Ending balance at Mar. 31, 2025	(4,508)	7	7,348	(4,547)	(7,316)	7,884	0	17,424	(4,659)	(4,881)
Beginning balance at Dec. 31, 2024	(3,977)	7	7,424	(4,565)	(6,843)	8,234	0	17,408	(4,677)	(4,497)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	12					344
Other comprehensive income, net	50					50
Ending balance at Sep. 30, 2025	(3,962)	7	7,377	(4,515)	(6,831)	8,676	0	17,456	(4,627)	(4,153)
Beginning balance at Mar. 31, 2025	(4,508)	7	7,348	(4,547)	(7,316)	7,884	0	17,424	(4,659)	(4,881)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	599				599	718				718
Other comprehensive income, net	17			17		17			17
Share-based compensation expense	23		23			22		22
Intercompany equity transfer						1		1
Ending balance at Jun. 30, 2025	(3,870)	7	7,370	(4,530)	(6,717)	8,642	0	17,447	(4,642)	(4,163)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(114)				(114)	10				10
Other comprehensive income, net	15			15		15			15
Share-based compensation expense	9		9			9		9
Ending balance at Sep. 30, 2025	$ (3,962)	$ 7	$ 7,377	$ (4,515)	$ (6,831)	$ 8,676	$ 0	$ 17,456	$ (4,627)	$ (4,153)