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, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Derivative Instruments | ||||
| Amount of (Loss) Gain Recognized in Income on Derivatives | $ 4 | $ (10) | $ (4) | $ 46 |
| Foreign currency forward contracts | Location, Statement of Income, Balance [Axis]: us-gaap:OtherNonoperatingIncomeExpense | ||||
| Derivative Instruments | ||||
| Amount of (Loss) Gain Recognized in Income on Derivatives | 4 | (10) | (4) | 44 |
| Fuel swaps | Location, Statement of Income, Balance [Axis]: us-gaap:OtherNonoperatingIncomeExpense | ||||
| Derivative Instruments | ||||
| Amount of (Loss) Gain Recognized in Income on Derivatives | $ 0 | $ 0 | $ 0 | $ 2 |