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Fair Value Measurements - Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Treasury bills | $ 2,226 | $ 2,399
Fuel derivatives: |  |
Interest rate derivatives (see Note 11) |  | 14
Equity Securities | 235 | 288
Total assets | 13,053 | 16,488
Liabilities |  |
Interest rate derivatives (see Note 11) |  | (4)
Options Held |  |
Fuel derivatives: |  |
Option contracts | 512 | 696
Certificates of deposit |  |
Assets |  |
Investments | 124 |
Time deposits |  |
Assets |  |
Investments | 450 | 625
Cash Equivalents |  |
Assets |  |
Cash equivalents | 9,040 | 12,340
Commercial paper |  |
Assets |  |
Cash equivalents | 179 | 90
Certificates of deposit |  |
Assets |  |
Cash equivalents | 23 |
Time deposits |  |
Assets |  |
Cash equivalents | 250 | 50
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Treasury bills | 2,226 | 2,399
Fuel derivatives: |  |
Interest rate derivatives (see Note 11) |  | 0
Equity Securities | 235 | 288
Total assets | 11,501 | 15,027
Liabilities |  |
Interest rate derivatives (see Note 11) |  | 0
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 |
Quoted prices in active markets for identical assets (Level 1) | Time deposits |  |
Assets |  |
Investments | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Cash Equivalents |  |
Assets |  |
Cash equivalents | 9,040 | 12,340
Quoted prices in active markets for identical assets (Level 1) | Commercial paper |  |
Assets |  |
Cash equivalents | 0 | 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: |  |
Interest rate derivatives (see Note 11) |  | 14
Equity Securities | 0 | 0
Total assets | 1,040 | 765
Liabilities |  |
Interest rate derivatives (see Note 11) |  | (4)
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 | 124 |
Significant other observable inputs (Level 2) | Time deposits |  |
Assets |  |
Investments | 450 | 625
Significant other observable inputs (Level 2) | Cash Equivalents |  |
Assets |  |
Cash equivalents | 0 | 0
Significant other observable inputs (Level 2) | Commercial paper |  |
Assets |  |
Cash equivalents | 179 | 90
Significant other observable inputs (Level 2) | Certificates of deposit |  |
Assets |  |
Cash equivalents | 23 |
Significant other observable inputs (Level 2) | Time deposits |  |
Assets |  |
Cash equivalents | 250 | 50
Significant unobservable inputs (Level 3) |  |
Assets |  |
Treasury bills | 0 | 0
Fuel derivatives: |  |
Interest rate derivatives (see Note 11) |  | 0
Equity Securities | 0 | 0
Total assets | 512 | 696
Liabilities |  |
Interest rate derivatives (see Note 11) |  | 0
Significant unobservable inputs (Level 3) | Options Held |  |
Fuel derivatives: |  |
Option contracts | 512 | 696
Significant unobservable inputs (Level 3) | Certificates of deposit |  |
Assets |  |
Investments | 0 |
Significant unobservable inputs (Level 3) | Time deposits |  |
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 | 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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