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Fair Value Measurements and Derivative Instruments - Schedule of Designated Cash Flow Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Effect of derivative instruments involved in hedging on the consolidated financial statements |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss on Derivatives | $ (14) | $ (11) | $ 42 | $ (42)
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 | 8 | 23 | 29 | 11
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 | (31) | (9) | (102) | 13
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 | $ 9 | $ (25) | $ 115 | $ (66)

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