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Fair Value Measurements - Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Fuel derivatives:    
Option contracts $ 1,322 $ 696
Fair Value, Measurements, Recurring    
Assets    
Treasury bills 2,292 2,399
Fuel derivatives:    
Interest rate derivatives (see Note 4) 3  
Equity Securities 261 288
Total assets 17,323 16,488
Liabilities    
Total liabilities 47 4
Fair Value, Measurements, Recurring | Options Contracts    
Fuel derivatives:    
Option contracts 1,319 696
Fair Value, Measurements, Recurring | Interest rate derivatives    
Liabilities    
Liabilities 1 4
Fair Value, Measurements, Recurring | Commodity Option    
Liabilities    
Liabilities 46  
Fair Value, Measurements, Recurring | Time deposits    
Assets    
Investments 325 625
Fair Value, Measurements, Recurring | Certificates of deposit    
Assets    
Investments 25  
Fair Value, Measurements, Recurring | Cash Equivalents    
Assets    
Cash equivalents 12,478 12,340
Fair Value, Measurements, Recurring | Commercial paper    
Assets    
Cash equivalents 270 90
Fair Value, Measurements, Recurring | Time deposits    
Assets    
Cash equivalents 350 50
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Treasury bills 2,292 2,399
Fuel derivatives:    
Interest rate derivatives (see Note 4) 0  
Equity Securities 261 288
Total assets 15,031 15,027
Liabilities    
Total liabilities 0 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) | Interest rate derivatives    
Liabilities    
Liabilities 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) | 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 12,478 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 0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Treasury bills 0 0
Fuel derivatives:    
Interest rate derivatives (see Note 4) 3  
Equity Securities 0 0
Total assets 973 765
Liabilities    
Total liabilities 1 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) | Interest rate derivatives    
Liabilities    
Liabilities 1 4
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Time deposits    
Assets    
Investments 325 625
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Certificates of deposit    
Assets    
Investments 25  
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 350 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 1,319 696
Liabilities    
Total liabilities 46 0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Options Contracts    
Fuel derivatives:    
Option contracts 1,319 696
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Interest rate derivatives    
Liabilities    
Liabilities 0 0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Commodity Option    
Liabilities    
Liabilities 46  
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 $ 0