Employee Benefit Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 75	$ 58	$ 17
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,884	14,691	13,557
Pension Benefits | Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,884	14,691
Pension Benefits | Recurring | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,398	4,956
Pension Benefits | Recurring | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,195	4,336
Pension Benefits | Recurring | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	75	58
Pension Benefits | Recurring | Equity | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,097	4,645
Pension Benefits | Recurring | Equity | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,097	4,639
Pension Benefits | Recurring | Equity | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	2
Pension Benefits | Recurring | Equity | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	4
Pension Benefits | Recurring | Fixed Income | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,144	4,177
Pension Benefits | Recurring | Fixed Income | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	227	183
Pension Benefits | Recurring | Fixed Income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,917	3,994
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	427	528
Pension Benefits | Recurring | Other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	74	134
Pension Benefits | Recurring | Other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	278	340
Pension Benefits | Recurring | Other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	75	54
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	1,694	2,514
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	3,522	2,827
American Airlines, Inc. | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	75	58	17
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,821	14,605	$ 13,477
American Airlines, Inc. | Pension Benefits | Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,821	14,605
American Airlines, Inc. | Pension Benefits | Recurring | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,335	4,870
American Airlines, Inc. | Pension Benefits | Recurring | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,195	4,336
American Airlines, Inc. | Pension Benefits | Recurring | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	75	58
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	3,055	4,589
American Airlines, Inc. | Pension Benefits | Recurring | Equity | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,055	4,583
American Airlines, Inc. | Pension Benefits | Recurring | Equity | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	2
American Airlines, Inc. | Pension Benefits | Recurring | Equity | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	4
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	3,123	4,147
American Airlines, Inc. | Pension Benefits | Recurring | Fixed Income | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	206	153
American Airlines, Inc. | Pension Benefits | Recurring | Fixed Income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,917	3,994
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	427	528
American Airlines, Inc. | Pension Benefits | Recurring | Other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	74	134
American Airlines, Inc. | Pension Benefits | Recurring | Other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	278	340
American Airlines, Inc. | Pension Benefits | Recurring | Other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	75	54
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	1,694	2,514
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	$ 3,522	$ 2,827