Accumulated Other Comprehensive Loss - Components of AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Tax
Beginning balance, tax	$ (1,606)
Amounts reclassified from AOCI	(4)
Net current-period other comprehensive income (loss)	(4)
Ending balance, tax	(1,610)
Net of tax
Beginning balance	(3,977)	$ (5,202)
Amounts reclassified from AOCI	18
Total other comprehensive income, net of tax	18	17
Ending balance	(4,508)	(5,500)
American Airlines, Inc.
Tax
Beginning balance, tax	(1,715)
Amounts reclassified from AOCI	(4)
Net current-period other comprehensive income (loss)	(4)
Ending balance, tax	(1,719)
Net of tax
Beginning balance	8,234	6,577
Amounts reclassified from AOCI	18
Total other comprehensive income, net of tax	18	17
Ending balance	7,884	6,386
Accumulated Other Comprehensive Loss
Net of tax
Beginning balance	(4,565)	(4,894)
Total other comprehensive income, net of tax	18	17
Ending balance	(4,547)	(4,877)
Accumulated Other Comprehensive Loss | American Airlines, Inc.
Net of tax
Beginning balance	(4,677)	(4,999)
Total other comprehensive income, net of tax	18	17
Ending balance	(4,659)	$ (4,982)
Pension, Retiree Medical and Other Postretirement Benefits
Before tax
Beginning balance, before tax	(2,959)
Amounts reclassified from AOCI	22
Net current-period other comprehensive income (loss)	22
Ending balance, before tax	(2,937)
Pension, Retiree Medical and Other Postretirement Benefits | American Airlines, Inc.
Before tax
Beginning balance, before tax	(2,962)
Amounts reclassified from AOCI	22
Net current-period other comprehensive income (loss)	22
Ending balance, before tax	$ (2,940)