Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (AOCI) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI tax, attributable to parent [Roll Forward]
Beginning balance, tax	$ (865)	$ (1,091)
Other comprehensive income (loss) before reclassifications, tax	(293)	236
Amounts reclassified from AOCI, tax	(46)	(10)
Net current-period other comprehensive income (loss), tax	(339)	226
Ending balance, tax	(1,204)	(865)	$ (1,091)
AOCI attributable to parent, net of tax [Roll Forward]
Beginning balance, net of tax	(7,103)	(6,331)
Other comprehensive income (loss) before reclassifications, net of tax	1,004	(809)
Amounts reclassified from AOCI, net of tax	157	37
Total other comprehensive income (loss), net of tax	1,161	(772)	(435)
Ending balance, net of tax	(5,942)	(7,103)	(6,331)
Pension, Retiree Medical and Other Postretirement Benefits
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(6,236)	(5,238)
Other comprehensive income (loss) before reclassifications, before tax	1,297	(1,045)
Amounts reclassified from AOCI, before tax	203	47
Net current-period other comprehensive income (loss), before tax	1,500	(998)
Ending balance, before tax	(4,736)	(6,236)	(5,238)
Unrealized Loss on Investments
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(2)	(2)
Other comprehensive income (loss) before reclassifications, before tax	0	0
Amounts reclassified from AOCI, before tax	0	0
Net current-period other comprehensive income (loss), before tax	0	0
Ending balance, before tax	(2)	(2)	(2)
American Airlines, Inc.
AOCI tax, attributable to parent [Roll Forward]
Beginning balance, tax	(977)	(1,203)
Other comprehensive income (loss) before reclassifications, tax	(292)	236
Amounts reclassified from AOCI, tax	(46)	(10)
Net current-period other comprehensive income (loss), tax	(338)	226
Ending balance, tax	(1,315)	(977)	(1,203)
AOCI attributable to parent, net of tax [Roll Forward]
Beginning balance, net of tax	(7,194)	(6,423)
Other comprehensive income (loss) before reclassifications, net of tax	997	(807)
Amounts reclassified from AOCI, net of tax	156	36
Total other comprehensive income (loss), net of tax	1,153	(771)	(431)
Ending balance, net of tax	(6,041)	(7,194)	(6,423)
American Airlines, Inc. | Pension, Retiree Medical and Other Postretirement Benefits
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(6,215)	(5,218)
Other comprehensive income (loss) before reclassifications, before tax	1,289	(1,043)
Amounts reclassified from AOCI, before tax	202	46
Net current-period other comprehensive income (loss), before tax	1,491	(997)
Ending balance, before tax	(4,724)	(6,215)	(5,218)
American Airlines, Inc. | Unrealized Loss on Investments
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(2)	(2)
Other comprehensive income (loss) before reclassifications, before tax	0	0
Amounts reclassified from AOCI, before tax	0	0
Net current-period other comprehensive income (loss), before tax	0	0
Ending balance, before tax	$ (2)	$ (2)	$ (2)