Accumulated Other Comprehensive Loss - Components of AOCI (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI tax, attributable to parent [Roll Forward]
Beginning balance, tax			$ (1,601)				$ (1,601)
Other comprehensive income (loss) before reclassifications, tax							73
Amounts reclassified from AOCI, tax							(14)
Net current-period other comprehensive income (loss), tax							59
Ending balance, tax	$ (1,542)						(1,542)
AOCI attributable to parent, net of tax [Roll Forward]
Beginning balance, net of tax			(4,585)				(4,585)
Other comprehensive income (loss) before reclassifications, net of tax							(250)
Amounts reclassified from AOCI, net of tax							47
Total other comprehensive income (loss), net of tax	(238)	$ 17	18	$ 28	$ 26	$ 26	(203)	$ 80
Ending balance, net of tax	(4,788)						(4,788)
American Airlines, Inc.
AOCI tax, attributable to parent [Roll Forward]
Beginning balance, tax			(1,710)				(1,710)
Other comprehensive income (loss) before reclassifications, tax							73
Amounts reclassified from AOCI, tax							(14)
Net current-period other comprehensive income (loss), tax							59
Ending balance, tax	(1,651)						(1,651)
AOCI attributable to parent, net of tax [Roll Forward]
Beginning balance, net of tax			(4,690)				(4,690)
Other comprehensive income (loss) before reclassifications, net of tax							(250)
Amounts reclassified from AOCI, net of tax							47
Total other comprehensive income (loss), net of tax	(238)	$ 17	18	$ 28	$ 26	$ 26	(203)	$ 80
Ending balance, net of tax	(4,893)						(4,893)
Pension, Retiree Medical and Other Postretirement Benefits
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax			(2,978)				(2,978)
Other comprehensive income (loss) before reclassifications, before tax							(324)
Amounts reclassified from AOCI, before tax							61
Net current-period other comprehensive income (loss), before tax							(263)
Ending balance, before tax	(3,241)						(3,241)
Pension, Retiree Medical and Other Postretirement Benefits | American Airlines, Inc.
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax			(2,974)				(2,974)
Other comprehensive income (loss) before reclassifications, before tax							(324)
Amounts reclassified from AOCI, before tax							61
Net current-period other comprehensive income (loss), before tax							(263)
Ending balance, before tax	(3,237)						(3,237)
Unrealized Gain (Loss) on Investments
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax			(6)				(6)
Other comprehensive income (loss) before reclassifications, before tax							1
Amounts reclassified from AOCI, before tax							0
Net current-period other comprehensive income (loss), before tax							1
Ending balance, before tax	(5)						(5)
Unrealized Gain (Loss) on Investments | American Airlines, Inc.
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax			$ (6)				(6)
Other comprehensive income (loss) before reclassifications, before tax							1
Amounts reclassified from AOCI, before tax							0
Net current-period other comprehensive income (loss), before tax							1
Ending balance, before tax	$ (5)						$ (5)