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Fair Value Measurements - Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Fuel derivatives:    
Option contracts $ 579 $ 696
Fair Value, Measurements, Recurring    
Assets    
Treasury bills 2,424 2,399
Fuel derivatives:    
Interest rate derivatives (see Note 4) 14  
Equity Securities 216 288
Total assets 14,468 16,488
Liabilities    
Total liabilities   4
Fair Value, Measurements, Recurring | Options Contracts    
Fuel derivatives:    
Option contracts 565 696
Fair Value, Measurements, Recurring | Commodity Option    
Liabilities    
Liabilities 29  
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 131  
Fair Value, Measurements, Recurring | Cash Equivalents    
Assets    
Cash equivalents 10,088 12,340
Fair Value, Measurements, Recurring | Commercial paper    
Assets    
Cash equivalents 315 90
Fair Value, Measurements, Recurring | Certificates of deposit    
Assets    
Cash equivalents 15  
Fair Value, Measurements, Recurring | Time deposits    
Assets    
Cash equivalents 25 50
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Treasury bills 2,424 2,399
Fuel derivatives:    
Interest rate derivatives (see Note 4) 0  
Equity Securities 216 288
Total assets 12,728 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 10,088 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) | 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:    
Interest rate derivatives (see Note 4) 14  
Equity Securities 0 0
Total assets 1,175 765
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 131  
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 315 90
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Certificates of deposit    
Assets    
Cash equivalents 15  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Time deposits    
Assets    
Cash equivalents 25 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 565 696
Liabilities    
Total liabilities   0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Options Contracts    
Fuel derivatives:    
Option contracts 565 696
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Commodity Option    
Liabilities    
Liabilities 29  
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) | Certificates of deposit    
Assets    
Cash equivalents 0  
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Time deposits    
Assets    
Cash equivalents $ 0 $ 0