Accumulated Other Comprehensive Loss - Components of AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Tax
Beginning balance, tax	$ (1,512)
Other comprehensive income (loss) before reclassifications	1
Amounts reclassified from AOCI	(5)
Net current-period other comprehensive income (loss)	(4)
Ending balance, tax	(1,516)
Net of tax
Beginning balance, net of tax	(4,894)
Other comprehensive income (loss) before reclassifications	(2)
Amounts reclassified from AOCI	19
Total other comprehensive income, net of tax	17	$ 18
Ending balance, net of tax	(4,877)
American Airlines, Inc.
Tax
Beginning balance, tax	(1,621)
Other comprehensive income (loss) before reclassifications	1
Amounts reclassified from AOCI	(5)
Net current-period other comprehensive income (loss)	(4)
Ending balance, tax	(1,625)
Net of tax
Beginning balance, net of tax	(4,999)
Other comprehensive income (loss) before reclassifications	(2)
Amounts reclassified from AOCI	19
Total other comprehensive income, net of tax	17	$ 18
Ending balance, net of tax	(4,982)
Pension, Retiree Medical and Other Postretirement Benefits
Before tax
Beginning balance, before tax	(3,380)
Other comprehensive income (loss) before reclassifications	0
Amounts reclassified from AOCI	24
Net current-period other comprehensive income (loss)	24
Ending balance, before tax	(3,356)
Pension, Retiree Medical and Other Postretirement Benefits | American Airlines, Inc.
Before tax
Beginning balance, before tax	(3,376)
Other comprehensive income (loss) before reclassifications	0
Amounts reclassified from AOCI	24
Net current-period other comprehensive income (loss)	24
Ending balance, before tax	(3,352)
Unrealized Loss on Investments
Before tax
Beginning balance, before tax	(2)
Other comprehensive income (loss) before reclassifications	(3)
Amounts reclassified from AOCI	0
Net current-period other comprehensive income (loss)	(3)
Ending balance, before tax	(5)
Unrealized Loss on Investments | American Airlines, Inc.
Before tax
Beginning balance, before tax	(2)
Other comprehensive income (loss) before reclassifications	(3)
Amounts reclassified from AOCI	0
Net current-period other comprehensive income (loss)	(3)
Ending balance, before tax	$ (5)