Accumulated Other Comprehensive Loss - Components 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
Tax
Beginning balance, tax			$ (1,606)				$ (1,606)
Amounts reclassified from AOCI							(14)
Net current-period other comprehensive income (loss)							(14)
Ending balance, tax	$ (1,620)						(1,620)
Net of tax
Beginning balance	(3,870)	$ (4,508)	(3,977)	$ (4,746)	$ (5,500)	$ (5,202)	(3,977)	$ (5,202)
Amounts reclassified from AOCI							50
Total other comprehensive income, net of tax	15	17	18	23	19	17	50	59
Ending balance	(3,962)	(3,870)	(4,508)	(4,854)	(4,746)	(5,500)	(3,962)	(4,854)
American Airlines, Inc.
Tax
Beginning balance, tax			(1,715)				(1,715)
Amounts reclassified from AOCI							(14)
Net current-period other comprehensive income (loss)							(14)
Ending balance, tax	(1,729)						(1,729)
Net of tax
Beginning balance	8,642	7,884	8,234	7,219	6,386	6,577	8,234	6,577
Amounts reclassified from AOCI							50
Total other comprehensive income, net of tax	15	17	18	23	19	17	50	59
Ending balance	8,676	8,642	7,884	7,223	7,219	6,386	8,676	7,223
Accumulated Other Comprehensive Loss
Net of tax
Beginning balance	(4,530)	(4,547)	(4,565)	(4,858)	(4,877)	(4,894)	(4,565)	(4,894)
Total other comprehensive income, net of tax	15	17	18	23	19	17
Ending balance	(4,515)	(4,530)	(4,547)	(4,835)	(4,858)	(4,877)	(4,515)	(4,835)
Accumulated Other Comprehensive Loss | American Airlines, Inc.
Net of tax
Beginning balance	(4,642)	(4,659)	(4,677)	(4,963)	(4,982)	(4,999)	(4,677)	(4,999)
Total other comprehensive income, net of tax	15	17	18	23	19	17
Ending balance	(4,627)	$ (4,642)	(4,659)	$ (4,940)	$ (4,963)	$ (4,982)	(4,627)	$ (4,940)
Pension, Retiree Medical and Other Postretirement Benefits
Before tax
Beginning balance, before tax			(2,959)				(2,959)
Amounts reclassified from AOCI							64
Net current-period other comprehensive income (loss)							64
Ending balance, before tax	(2,895)						(2,895)
Pension, Retiree Medical and Other Postretirement Benefits | American Airlines, Inc.
Before tax
Beginning balance, before tax			$ (2,962)				(2,962)
Amounts reclassified from AOCI							64
Net current-period other comprehensive income (loss)							64
Ending balance, before tax	$ (2,898)						$ (2,898)