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Leases - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) aircraft | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Operating lease cost | $ | $ 2,016 | $ 2,007 | $ 2,012
Leased Aircrafts |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of operated aircrafts | 737 |  |
Aircrafts in Temporary Storage |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of operated aircrafts | 7 |  |
Aircrafts Leased Under Capacity Purchase Agreements |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of operated aircrafts | 237 |  |
Boeing 787 | Operating Lease Commitments |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease commitments that have not yet commenced | $ | $ 669 |  |
Operating lease commitments that have not yet commenced, number of aircraft | 5 |  |
Operating lease commitments that have not yet commenced, lease term | 10 years |  |
Republic Holdings |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Ownership Interest | 25.00% |  |
Republic Holdings |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease cost | $ | $ 274 | 242 | 190
American Airlines, Inc. |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease cost | $ | $ 1,992 | 1,987 | 1,998
American Airlines, Inc. | Leased Aircrafts |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of operated aircrafts | 737 |  |
American Airlines, Inc. | Aircrafts in Temporary Storage |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of operated aircrafts | 7 |  |
American Airlines, Inc. | Aircrafts Leased Under Capacity Purchase Agreements |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of operated aircrafts | 237 |  |
American Airlines, Inc. | Boeing 787 | Operating Lease Commitments |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease commitments that have not yet commenced | $ | $ 669 |  |
Operating lease commitments that have not yet commenced, number of aircraft | 5 |  |
Operating lease commitments that have not yet commenced, lease term | 10 years |  |
American Airlines, Inc. | Republic Holdings |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Ownership Interest | 25.00% |  |
American Airlines, Inc. | Republic Holdings |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease cost | $ | $ 274 | $ 242 | $ 190
Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease terms | 1 year |  |
Minimum | American Airlines, Inc. |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease terms | 1 year |  |
Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease terms | 10 years |  |
Maximum | American Airlines, Inc. |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease terms | 10 years |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 + Details
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