Employee Benefit Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 63	$ 68	$ 84
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,792	12,254	12,431
Pension Benefits | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,707	3,028
Pension Benefits | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,678	3,867
Pension Benefits | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	63	68
Pension Benefits | Equity | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,087	2,498
Pension Benefits | Equity | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,087	2,498
Pension Benefits | Equity | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Equity | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Fixed Income | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,866	4,162
Pension Benefits | Fixed Income | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	476	439
Pension Benefits | Fixed Income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,390	3,723
Pension Benefits | Fixed Income | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Other | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	495	303
Pension Benefits | Other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	144	91
Pension Benefits | Other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	288	144
Pension Benefits | Other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	63	68
Pension Benefits | Common/collective trusts | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	273	1,153
Pension Benefits | Private equity | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,071	4,138
American Airlines, Inc. | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	63	68	84
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,702	12,175	$ 12,358
American Airlines, Inc. | Pension Benefits | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,692	3,016
American Airlines, Inc. | Pension Benefits | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,678	3,867
American Airlines, Inc. | Pension Benefits | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	63	68
American Airlines, Inc. | Pension Benefits | Equity | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,083	2,498
American Airlines, Inc. | Pension Benefits | Equity | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,083	2,498
American Airlines, Inc. | Pension Benefits | Equity | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. | Pension Benefits | Equity | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. | Pension Benefits | Fixed Income | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,855	4,150
American Airlines, Inc. | Pension Benefits | Fixed Income | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	465	427
American Airlines, Inc. | Pension Benefits | Fixed Income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,390	3,723
American Airlines, Inc. | Pension Benefits | Fixed Income | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. | Pension Benefits | Other | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	495	303
American Airlines, Inc. | Pension Benefits | Other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	144	91
American Airlines, Inc. | Pension Benefits | Other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	288	144
American Airlines, Inc. | Pension Benefits | Other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	63	68
American Airlines, Inc. | Pension Benefits | Common/collective trusts | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	198	1,086
American Airlines, Inc. | Pension Benefits | Private equity | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 4,071	$ 4,138