Accumulated Other Comprehensive Loss - Components of AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Tax
Beginning balance, tax	$ (1,657)
Other comprehensive income (loss) before reclassifications	0
Amounts reclassified from AOCI	(5)
Net current-period other comprehensive income (loss)	(5)
Ending balance, tax	(1,662)
Net of tax
Beginning balance	(3,727)	$ (3,977)
Other comprehensive income (loss) before reclassifications	1
Amounts reclassified from AOCI	16
Total other comprehensive income, net of tax	17	18
Ending balance	(4,077)	(4,508)
American Airlines, Inc.
Tax
Beginning balance, tax	(1,765)
Other comprehensive income (loss) before reclassifications	0
Amounts reclassified from AOCI	(5)
Net current-period other comprehensive income (loss)	(5)
Ending balance, tax	(1,770)
Net of tax
Beginning balance	9,028	8,234
Other comprehensive income (loss) before reclassifications	1
Amounts reclassified from AOCI	16
Total other comprehensive income, net of tax	17	18
Ending balance	8,793	7,884
Accumulated Other Comprehensive Loss
Net of tax
Beginning balance	(4,389)	(4,565)
Total other comprehensive income, net of tax	17	18
Ending balance	(4,372)	(4,547)
Accumulated Other Comprehensive Loss | American Airlines, Inc.
Net of tax
Beginning balance	(4,507)	(4,677)
Total other comprehensive income, net of tax	17	18
Ending balance	(4,490)	$ (4,659)
Pension, Retiree Medical and Other Postretirement Benefits
Before tax
Beginning balance, before tax	(2,732)
Amounts reclassified from AOCI	21
Net current-period other comprehensive income (loss)	24
Ending balance, before tax	(2,708)
Net of tax
Other comprehensive income (loss) before reclassifications	3
Pension, Retiree Medical and Other Postretirement Benefits | American Airlines, Inc.
Before tax
Beginning balance, before tax	(2,742)
Amounts reclassified from AOCI	21
Net current-period other comprehensive income (loss)	24
Ending balance, before tax	(2,718)
Net of tax
Other comprehensive income (loss) before reclassifications	3
Unrealized Loss on Investments
Before tax
Beginning balance, before tax	0
Amounts reclassified from AOCI	0
Net current-period other comprehensive income (loss)	(2)
Ending balance, before tax	(2)
Net of tax
Other comprehensive income (loss) before reclassifications	(2)
Unrealized Loss on Investments | American Airlines, Inc.
Before tax
Beginning balance, before tax	0
Amounts reclassified from AOCI	0
Net current-period other comprehensive income (loss)	(2)
Ending balance, before tax	(2)
Net of tax
Other comprehensive income (loss) before reclassifications	$ (2)