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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