Employee Benefit Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 68	$ 84	$ 75
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,254	12,431	11,884
Pension Benefits | Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,254	12,431
Pension Benefits | Recurring | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,028	3,436
Pension Benefits | Recurring | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,867	3,586
Pension Benefits | Recurring | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	68	84
Pension Benefits | Recurring | Equity | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,498	3,182
Pension Benefits | Recurring | Equity | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,498	3,182
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	4,162	3,498
Pension Benefits | Recurring | Fixed Income | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	439	260
Pension Benefits | Recurring | Fixed Income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,723	3,238
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	303	426
Pension Benefits | Recurring | Other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	91	(6)
Pension Benefits | Recurring | Other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	144	348
Pension Benefits | Recurring | Other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	68	84
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	1,153	1,244
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	4,138	4,081
American Airlines, Inc. | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	68	84	75
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,175	12,358	$ 11,821
American Airlines, Inc. | Pension Benefits | Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,175	12,358
American Airlines, Inc. | Pension Benefits | Recurring | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,016	3,363
American Airlines, Inc. | Pension Benefits | Recurring | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,867	3,586
American Airlines, Inc. | Pension Benefits | Recurring | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	68	84
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	2,498	3,134
American Airlines, Inc. | Pension Benefits | Recurring | Equity | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,498	3,134
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	4,150	3,473
American Airlines, Inc. | Pension Benefits | Recurring | Fixed Income | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	427	235
American Airlines, Inc. | Pension Benefits | Recurring | Fixed Income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,723	3,238
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	303	426
American Airlines, Inc. | Pension Benefits | Recurring | Other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	91	(6)
American Airlines, Inc. | Pension Benefits | Recurring | Other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	144	348
American Airlines, Inc. | Pension Benefits | Recurring | Other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	68	84
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	1,086	1,244
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	$ 4,138	$ 4,081