Employee Benefit Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 84	$ 75	$ 58
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,431	11,884	14,691
Pension Benefits | Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,431	11,884
Pension Benefits | Recurring | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,436	3,398
Pension Benefits | Recurring | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,586	3,195
Pension Benefits | Recurring | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	84	75
Pension Benefits | Recurring | Equity | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,182	3,097
Pension Benefits | Recurring | Equity | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,182	3,097
Pension Benefits | Recurring | Equity | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Recurring | Equity | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Recurring | Fixed Income | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,498	3,144
Pension Benefits | Recurring | Fixed Income | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	260	227
Pension Benefits | Recurring | Fixed Income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,238	2,917
Pension Benefits | Recurring | Fixed Income | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Recurring | Other | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	426	427
Pension Benefits | Recurring | Other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(6)	74
Pension Benefits | Recurring | Other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	348	278
Pension Benefits | Recurring | Other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	84	75
Pension Benefits | Recurring | Common/collective trusts | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,244	1,694
Pension Benefits | Recurring | Private Equity | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,081	3,522
American Airlines, Inc. | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	84	75	58
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,358	11,821	$ 14,605
American Airlines, Inc. | Pension Benefits | Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,358	11,821
American Airlines, Inc. | Pension Benefits | Recurring | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,363	3,335
American Airlines, Inc. | Pension Benefits | Recurring | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,586	3,195
American Airlines, Inc. | Pension Benefits | Recurring | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	84	75
American Airlines, Inc. | Pension Benefits | Recurring | Equity | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,134	3,055
American Airlines, Inc. | Pension Benefits | Recurring | Equity | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,134	3,055
American Airlines, Inc. | Pension Benefits | Recurring | Equity | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. | Pension Benefits | Recurring | Equity | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. | Pension Benefits | Recurring | Fixed Income | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,473	3,123
American Airlines, Inc. | Pension Benefits | Recurring | Fixed Income | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	235	206
American Airlines, Inc. | Pension Benefits | Recurring | Fixed Income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,238	2,917
American Airlines, Inc. | Pension Benefits | Recurring | Fixed Income | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. | Pension Benefits | Recurring | Other | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	426	427
American Airlines, Inc. | Pension Benefits | Recurring | Other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(6)	74
American Airlines, Inc. | Pension Benefits | Recurring | Other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	348	278
American Airlines, Inc. | Pension Benefits | Recurring | Other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	84	75
American Airlines, Inc. | Pension Benefits | Recurring | Common/collective trusts | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,244	1,694
American Airlines, Inc. | Pension Benefits | Recurring | Private Equity | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 4,081	$ 3,522