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Fair Value Measurements - Measured on Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fuel derivatives: |  |
Option contracts | $ 1,305 | $ 696
Fair Value, Measurements, Recurring |  |
Assets |  |
Treasury bills | 2,432 | 2,399
Fuel derivatives: |  |
Interest rate derivatives (see Note 4) | 11 |
Equity Securities | 225 | 288
Total assets | 17,961 | 16,488
Liabilities |  |
Total liabilities |  | 4
Fair Value, Measurements, Recurring | Options Contracts |  |
Fuel derivatives: |  |
Option contracts | 1,294 | 696
Fair Value, Measurements, Recurring | Commodity Option |  |
Liabilities |  |
Liabilities | 167 |
Fair Value, Measurements, Recurring | Interest rate derivatives |  |
Liabilities |  |
Liabilities |  | 4
Fair Value, Measurements, Recurring | Time deposits |  |
Assets |  |
Investments | 675 | 625
Fair Value, Measurements, Recurring | Certificates of deposit |  |
Assets |  |
Investments | 90 |
Fair Value, Measurements, Recurring | Cash Equivalents |  |
Assets |  |
Cash equivalents | 12,964 | 12,340
Fair Value, Measurements, Recurring | Commercial paper |  |
Assets |  |
Cash equivalents | 270 | 90
Fair Value, Measurements, Recurring | Time deposits |  |
Assets |  |
Cash equivalents |  | 50
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Treasury bills | 2,432 | 2,399
Fuel derivatives: |  |
Interest rate derivatives (see Note 4) | 0 |
Equity Securities | 225 | 288
Total assets | 15,621 | 15,027
Liabilities |  |
Total liabilities |  | 0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Options Contracts |  |
Fuel derivatives: |  |
Option contracts | 0 | 0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Commodity Option |  |
Liabilities |  |
Liabilities | 0 |
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Interest rate derivatives |  |
Liabilities |  |
Liabilities |  | 0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Time deposits |  |
Assets |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Certificates of deposit |  |
Assets |  |
Investments | 0 |
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Cash Equivalents |  |
Assets |  |
Cash equivalents | 12,964 | 12,340
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Commercial paper |  |
Assets |  |
Cash equivalents | 0 | 0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Time deposits |  |
Assets |  |
Cash equivalents |  | 0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) |  |
Assets |  |
Treasury bills | 0 | 0
Fuel derivatives: |  |
Interest rate derivatives (see Note 4) | 11 |
Equity Securities | 0 | 0
Total assets | 1,046 | 765
Liabilities |  |
Total liabilities |  | 4
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Options Contracts |  |
Fuel derivatives: |  |
Option contracts | 0 | 0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commodity Option |  |
Liabilities |  |
Liabilities | 0 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Interest rate derivatives |  |
Liabilities |  |
Liabilities |  | 4
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Time deposits |  |
Assets |  |
Investments | 675 | 625
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Certificates of deposit |  |
Assets |  |
Investments | 90 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Cash Equivalents |  |
Assets |  |
Cash equivalents | 0 | 0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commercial paper |  |
Assets |  |
Cash equivalents | 270 | 90
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Time deposits |  |
Assets |  |
Cash equivalents |  | 50
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |
Assets |  |
Treasury bills | 0 | 0
Fuel derivatives: |  |
Interest rate derivatives (see Note 4) | 0 |
Equity Securities | 0 | 0
Total assets | 1,294 | 696
Liabilities |  |
Total liabilities |  | 0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Options Contracts |  |
Fuel derivatives: |  |
Option contracts | 1,294 | 696
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Commodity Option |  |
Liabilities |  |
Liabilities | 167 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Interest rate derivatives |  |
Liabilities |  |
Liabilities |  | 0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Time deposits |  |
Assets |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Certificates of deposit |  |
Assets |  |
Investments | 0 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Cash Equivalents |  |
Assets |  |
Cash equivalents | 0 | 0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Commercial paper |  |
Assets |  |
Cash equivalents | $ 0 | 0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Time deposits |  |
Assets |  |
Cash equivalents |  | $ 0

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