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Investments - Schedule of Equity Investments (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | $ 149 | $ 186
American Airlines, Inc. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 149 | 186
Equity Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total | 484 | 541
Equity Securities | American Airlines, Inc. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total | $ 484 | $ 541
China Southern Airlines |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Ownership interest, fair value method investments | 1.50% | 1.50%
Carrying value, fair value method investments | $ 97 | $ 115
China Southern Airlines | American Airlines, Inc. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Ownership interest, fair value method investments | 1.50% | 1.50%
Carrying value, fair value method investments | $ 97 | $ 115
Republic Airways Holdings Inc. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Ownership interest, equity method investments | 25.00% | 25.00%
Carrying value, equity method investments | $ 238 | $ 240
Republic Airways Holdings Inc. | American Airlines, Inc. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Ownership interest, equity method investments | 25.00% | 25.00%
Carrying value, equity method investments | $ 238 | $ 240

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