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Fair Value Measurements and Derivative Instruments - Schedule of Effect of Derivative Instruments Not Designated as Cash Flow Hedging Instruments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Effect of derivative instruments involved in hedging on the consolidated financial statements |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss on Derivatives | $ (6) | $ (86) | $ 303 | $ (46)
Interest rate swaps |  |  |  |
Effect of derivative instruments involved in hedging on the consolidated financial statements |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss on Derivatives | 1 | (20) | (7) | 8
Foreign currency forward contracts |  |  |  |
Effect of derivative instruments involved in hedging on the consolidated financial statements |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss on Derivatives | (20) | 67 | 334 | (36)
Fuel swaps |  |  |  |
Effect of derivative instruments involved in hedging on the consolidated financial statements |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss on Derivatives | $ 13 | $ (133) | $ (24) | $ (18)

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