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Fair Value Measurements - Measured on Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fuel derivatives: |  |
Option contracts | $ 696 | $ 134
Fair Value, Measurements, Recurring |  |
Assets |  |
Treasury bills | 2,399 | 1,800
Fuel derivatives: |  |
Equity Securities | 288 | 259
Total assets | 16,488 | 13,727
Liabilities |  |
Interest rate derivatives (see Note 11) | (4) | (6)
Fair Value, Measurements, Recurring | Options Held |  |
Fuel derivatives: |  |
Option contracts | 696 | 134
Fair Value, Measurements, Recurring | Certificates of deposit |  |
Assets |  |
Investments |  | 46
Fair Value, Measurements, Recurring | Time deposits |  |
Assets |  |
Investments | 625 | 425
Fair Value, Measurements, Recurring | Cash Equivalents |  |
Assets |  |
Cash equivalents | 12,340 | 10,663
Fair Value, Measurements, Recurring | Commercial paper |  |
Assets |  |
Cash equivalents | 90 | 90
Fair Value, Measurements, Recurring | Certificates of deposit |  |
Assets |  |
Cash equivalents |  | 10
Fair Value, Measurements, Recurring | Time deposits |  |
Assets |  |
Cash equivalents | 50 | 300
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Treasury bills | 2,399 | 1,800
Fuel derivatives: |  |
Equity Securities | 288 | 259
Total assets | 15,027 | 12,722
Liabilities |  |
Interest rate derivatives (see Note 11) | 0 | 0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Options Held |  |
Fuel derivatives: |  |
Option contracts | 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) | Time deposits |  |
Assets |  |
Investments | 0 | 0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Cash Equivalents |  |
Assets |  |
Cash equivalents | 12,340 | 10,663
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) | Certificates of deposit |  |
Assets |  |
Cash equivalents |  | 0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Time deposits |  |
Assets |  |
Cash equivalents | 0 | 0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) |  |
Assets |  |
Treasury bills | 0 | 0
Fuel derivatives: |  |
Equity Securities | 0 | 0
Total assets | 765 | 871
Liabilities |  |
Interest rate derivatives (see Note 11) | (4) | (6)
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Options Held |  |
Fuel derivatives: |  |
Option contracts | 0 | 0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Certificates of deposit |  |
Assets |  |
Investments |  | 46
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Time deposits |  |
Assets |  |
Investments | 625 | 425
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 | 90 | 90
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Certificates of deposit |  |
Assets |  |
Cash equivalents |  | 10
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Time deposits |  |
Assets |  |
Cash equivalents | 50 | 300
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |
Assets |  |
Treasury bills | 0 | 0
Fuel derivatives: |  |
Equity Securities | 0 | 0
Total assets | 696 | 134
Liabilities |  |
Interest rate derivatives (see Note 11) | 0 | 0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Options Held |  |
Fuel derivatives: |  |
Option contracts | 696 | 134
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Certificates of deposit |  |
Assets |  |
Investments |  | 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) | 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) | Certificates of deposit |  |
Assets |  |
Cash equivalents |  | 0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Time deposits |  |
Assets |  |
Cash equivalents | $ 0 | $ 0

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