Employee Benefit Plans - Fair Values of Retiree Medical and Other Postretirement Benefit Plans Assets by Asset Category (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 58	$ 17	$ 12
Mutual funds/exchange traded funds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	17.00%	26.00%
Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 167	$ 170	204
Retiree Medical and  Other Postretirement Benefits | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	4
Retiree Medical and  Other Postretirement Benefits | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	163	166
Retiree Medical and  Other Postretirement Benefits | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retiree Medical and  Other Postretirement Benefits | Money market fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	4
Retiree Medical and  Other Postretirement Benefits | Money market fund | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	4
Retiree Medical and  Other Postretirement Benefits | Money market fund | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retiree Medical and  Other Postretirement Benefits | Money market fund | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retiree Medical and  Other Postretirement Benefits | Mutual funds – AAL Class
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	163	166
Retiree Medical and  Other Postretirement Benefits | Mutual funds – AAL Class | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retiree Medical and  Other Postretirement Benefits | Mutual funds – AAL Class | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	163	166
Retiree Medical and  Other Postretirement Benefits | Mutual funds – AAL Class | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0
Retiree Medical and  Other Postretirement Benefits | Mutual funds/exchange traded funds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	24.00%	25.00%
American Airlines, Inc. | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 58	$ 17	12
American Airlines, Inc. | Mutual funds/exchange traded funds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	14.00%
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 167	170	$ 204
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	4
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	163	166
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits | Money market fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	4
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits | Money market fund | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	4
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits | Money market fund | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits | Money market fund | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits | Mutual funds – AAL Class
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	163	166
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits | Mutual funds – AAL Class | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits | Mutual funds – AAL Class | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	163	166
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits | Mutual funds – AAL Class | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits | Mutual funds/exchange traded funds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	24.00%	25.00%