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FAIR VALUE MEASUREMENTS - Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Treasury bills | $ 1,094 | $ 1,983
Fuel derivatives: |  |
Equity securities | 367 | 280
Total assets | 9,222 | 11,977
Options Held |  |
Fuel derivatives: |  |
Option contracts | 130 | 223
Certificates of deposit |  |
Assets |  |
Investments | 122 | 203
Cash Equivalents |  |
Assets |  |
Cash equivalents | 7,209 | 9,032
Commercial paper |  |
Assets |  |
Cash equivalents |  | 135
Certificates of deposit |  |
Assets |  |
Cash equivalents |  | 21
Time deposits |  |
Assets |  |
Cash equivalents | 300 | 100
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Treasury bills | 1,094 | 1,983
Fuel derivatives: |  |
Equity securities | 367 | 280
Total assets | 8,670 | 11,295
Quoted prices in active markets for identical assets (Level 1) | Options Held |  |
Fuel derivatives: |  |
Option contracts | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Certificates of deposit |  |
Assets |  |
Investments | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Cash Equivalents |  |
Assets |  |
Cash equivalents | 7,209 | 9,032
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) | Certificates of deposit |  |
Assets |  |
Cash equivalents |  | 0
Quoted prices in active markets for identical assets (Level 1) | Time deposits |  |
Assets |  |
Cash equivalents | 0 | 0
Significant other observable inputs (Level 2) |  |
Assets |  |
Treasury bills | 0 | 0
Fuel derivatives: |  |
Equity securities | 0 | 0
Total assets | 422 | 459
Significant other observable inputs (Level 2) | Options Held |  |
Fuel derivatives: |  |
Option contracts | 0 | 0
Significant other observable inputs (Level 2) | Certificates of deposit |  |
Assets |  |
Investments | 122 | 203
Significant other observable inputs (Level 2) | Cash Equivalents |  |
Assets |  |
Cash equivalents | 0 | 0
Significant other observable inputs (Level 2) | Commercial paper |  |
Assets |  |
Cash equivalents |  | 135
Significant other observable inputs (Level 2) | Certificates of deposit |  |
Assets |  |
Cash equivalents |  | 21
Significant other observable inputs (Level 2) | Time deposits |  |
Assets |  |
Cash equivalents | 300 | 100
Significant unobservable inputs (Level 3) |  |
Assets |  |
Treasury bills | 0 | 0
Fuel derivatives: |  |
Equity securities | 0 | 0
Total assets | 130 | 223
Significant unobservable inputs (Level 3) | Options Held |  |
Fuel derivatives: |  |
Option contracts | 130 | 223
Significant unobservable inputs (Level 3) | Certificates of deposit |  |
Assets |  |
Investments | 0 | 0
Significant unobservable inputs (Level 3) | Cash Equivalents |  |
Assets |  |
Cash equivalents | 0 | 0
Significant unobservable inputs (Level 3) | Commercial paper |  |
Assets |  |
Cash equivalents |  | 0
Significant unobservable inputs (Level 3) | Certificates of deposit |  |
Assets |  |
Cash equivalents |  | 0
Significant unobservable inputs (Level 3) | Time deposits |  |
Assets |  |
Cash equivalents | $ 0 | $ 0

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