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v3.25.2

Fair Value Measurements - Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets |  |
Treasury bills |  | $ 1,094
Fuel derivatives: |  |
Equity Securities | $ 394 | 367
Total assets | 4,233 | 9,222
Option contracts |  |
Fuel derivatives: |  |
Option contracts |  | 130
Certificates of deposit |  |
Assets |  |
Certificates of deposit | 64 | 122
Time deposits |  |
Assets |  |
Certificates of deposit | 300 |
Cash equivalents |  |
Assets |  |
Cash equivalents | 3,295 | 7,209
Commercial paper |  |
Assets |  |
Cash equivalents | 180 |
Time deposits |  |
Assets |  |
Cash equivalents |  | 300
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Treasury bills |  | 1,094
Fuel derivatives: |  |
Equity Securities | 394 | 367
Total assets | 3,689 | 8,670
Quoted prices in active markets for identical assets (Level 1) | Option contracts |  |
Fuel derivatives: |  |
Option contracts |  | 0
Quoted prices in active markets for identical assets (Level 1) | Certificates of deposit |  |
Assets |  |
Certificates of deposit | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Time deposits |  |
Assets |  |
Certificates of deposit | 0 |
Quoted prices in active markets for identical assets (Level 1) | Cash equivalents |  |
Assets |  |
Cash equivalents | 3,295 | 7,209
Quoted prices in active markets for identical assets (Level 1) | Commercial paper |  |
Assets |  |
Cash equivalents | 0 |
Quoted prices in active markets for identical assets (Level 1) | Time deposits |  |
Assets |  |
Cash equivalents |  | 0
Significant other observable inputs (Level 2) |  |
Assets |  |
Treasury bills |  | 0
Fuel derivatives: |  |
Equity Securities | 0 | 0
Total assets | 544 | 422
Significant other observable inputs (Level 2) | Option contracts |  |
Fuel derivatives: |  |
Option contracts |  | 0
Significant other observable inputs (Level 2) | Certificates of deposit |  |
Assets |  |
Certificates of deposit | 64 | 122
Significant other observable inputs (Level 2) | Time deposits |  |
Assets |  |
Certificates of deposit | 300 |
Significant other observable inputs (Level 2) | Cash equivalents |  |
Assets |  |
Cash equivalents | 0 | 0
Significant other observable inputs (Level 2) | Commercial paper |  |
Assets |  |
Cash equivalents | $ 180 |
Significant other observable inputs (Level 2) | Time deposits |  |
Assets |  |
Cash equivalents |  | 300
Significant unobservable inputs (Level 3) |  |
Assets |  |
Treasury bills |  | 0
Fuel derivatives: |  |
Equity Securities |  | 0
Total assets |  | 130
Significant unobservable inputs (Level 3) | Option contracts |  |
Fuel derivatives: |  |
Option contracts |  | 130
Significant unobservable inputs (Level 3) | Certificates of deposit |  |
Assets |  |
Certificates of deposit |  | 0
Significant unobservable inputs (Level 3) | Cash equivalents |  |
Assets |  |
Cash equivalents |  | 0
Significant unobservable inputs (Level 3) | Time deposits |  |
Assets |  |
Cash equivalents |  | $ 0

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