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Investments - Schedule of Equity Investments (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | $ 112 | $ 120
American Airlines, Inc. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 112 | 120
Equity Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total | 493 | 515
Equity Securities | American Airlines, Inc. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total | $ 493 | $ 515
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 | $ 123 | $ 142
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 | $ 123 | $ 142
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 | $ 258 | $ 253
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 | $ 258 | $ 253

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