Accumulated Other Comprehensive Loss - Components of AOCI (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Tax
Beginning balance, tax			$ (1,512)				$ (1,512)
Other comprehensive income (loss) before reclassifications							(1)
Amounts reclassified from AOCI							(16)
Net current-period other comprehensive income (loss)							(17)
Ending balance, tax	$ (1,529)						(1,529)
Net of tax
Beginning balance, net of tax			(4,894)				(4,894)
Other comprehensive income (loss) before reclassifications							4
Amounts reclassified from AOCI							55
Total other comprehensive income (loss), net of tax	23	$ 19	17	$ (238)	$ 17	$ 18	59	$ (203)
Ending balance, net of tax	(4,835)						(4,835)
Total	(4,835)						(4,835)
American Airlines, Inc.
Tax
Beginning balance, tax			(1,621)				(1,621)
Other comprehensive income (loss) before reclassifications							(1)
Amounts reclassified from AOCI							(16)
Net current-period other comprehensive income (loss)							(17)
Ending balance, tax	(1,638)						(1,638)
Net of tax
Beginning balance, net of tax			(4,999)				(4,999)
Other comprehensive income (loss) before reclassifications							4
Amounts reclassified from AOCI							55
Total other comprehensive income (loss), net of tax	23	$ 19	17	$ (238)	$ 17	$ 18	59	$ (203)
Ending balance, net of tax	(4,940)						(4,940)
Total	(4,940)						(4,940)
Pension, Retiree Medical and Other Postretirement Benefits
Before tax
Beginning balance, before tax			(3,380)				(3,380)
Other comprehensive income (loss) before reclassifications							0
Amounts reclassified from AOCI							71
Net current-period other comprehensive income (loss)							71
Ending balance, before tax	(3,309)						(3,309)
Pension, Retiree Medical and Other Postretirement Benefits | American Airlines, Inc.
Before tax
Beginning balance, before tax			(3,376)				(3,376)
Other comprehensive income (loss) before reclassifications							0
Amounts reclassified from AOCI							71
Net current-period other comprehensive income (loss)							71
Ending balance, before tax	(3,305)						(3,305)
Unrealized Gain (Loss) on Investments
Before tax
Beginning balance, before tax			(2)				(2)
Other comprehensive income (loss) before reclassifications							5
Amounts reclassified from AOCI							0
Net current-period other comprehensive income (loss)							5
Ending balance, before tax	3						3
Unrealized Gain (Loss) on Investments | American Airlines, Inc.
Before tax
Beginning balance, before tax			$ (2)				(2)
Other comprehensive income (loss) before reclassifications							5
Amounts reclassified from AOCI							0
Net current-period other comprehensive income (loss)							5
Ending balance, before tax	$ 3						$ 3