Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (AOCI) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI tax, attributable to parent [Roll Forward]
Beginning balance, tax	$ (1,601)	$ (1,204)
Other comprehensive income (loss) before reclassifications, tax	108	(365)
Amounts reclassified from AOCI, tax	(19)	(32)
Net current-period other comprehensive income (loss), tax	89	(397)
Ending balance, tax	(1,512)	(1,601)	$ (1,204)
AOCI attributable to parent, net of tax [Roll Forward]
Beginning balance, net of tax	(4,585)	(5,942)
Other comprehensive income (loss) before reclassifications, net of tax	(374)	1,249
Amounts reclassified from AOCI, net of tax	65	108
Total other comprehensive income (loss), net of tax	(309)	1,357	1,161
Ending balance, net of tax	(4,894)	(4,585)	(5,942)
Pension, Retiree Medical and Other Postretirement Benefits
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(2,978)	(4,736)
Other comprehensive income (loss) before reclassifications, before tax	(486)	1,618
Amounts reclassified from AOCI, before tax	84	140
Net current-period other comprehensive income (loss), before tax	(402)	1,758
Ending balance, before tax	(3,380)	(2,978)	(4,736)
Unrealized Gain (Loss) on Investments
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(6)	(2)
Other comprehensive income (loss) before reclassifications, before tax	4	(4)
Amounts reclassified from AOCI, before tax	0	0
Net current-period other comprehensive income (loss), before tax	4	(4)
Ending balance, before tax	(2)	(6)	(2)
American Airlines, Inc.
AOCI tax, attributable to parent [Roll Forward]
Beginning balance, tax	(1,710)	(1,315)
Other comprehensive income (loss) before reclassifications, tax	108	(363)
Amounts reclassified from AOCI, tax	(19)	(32)
Net current-period other comprehensive income (loss), tax	89	(395)
Ending balance, tax	(1,621)	(1,710)	(1,315)
AOCI attributable to parent, net of tax [Roll Forward]
Beginning balance, net of tax	(4,690)	(6,041)
Other comprehensive income (loss) before reclassifications, net of tax	(374)	1,243
Amounts reclassified from AOCI, net of tax	65	108
Total other comprehensive income (loss), net of tax	(309)	1,351	1,153
Ending balance, net of tax	(4,999)	(4,690)	(6,041)
American Airlines, Inc. | Pension, Retiree Medical and Other Postretirement Benefits
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(2,974)	(4,724)
Other comprehensive income (loss) before reclassifications, before tax	(486)	1,610
Amounts reclassified from AOCI, before tax	84	140
Net current-period other comprehensive income (loss), before tax	(402)	1,750
Ending balance, before tax	(3,376)	(2,974)	(4,724)
American Airlines, Inc. | Unrealized Gain (Loss) on Investments
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(6)	(2)
Other comprehensive income (loss) before reclassifications, before tax	4	(4)
Amounts reclassified from AOCI, before tax	0	0
Net current-period other comprehensive income (loss), before tax	4	(4)
Ending balance, before tax	$ (2)	$ (6)	$ (2)