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Fair Value Measurements - Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Fuel derivatives:    
Option contracts $ 134 $ 223
Fair Value, Measurements, Recurring    
Assets    
Treasury bills 690 1,983
Fuel derivatives:    
Equity Securities 354 280
Total assets 9,870 11,977
Fair Value, Measurements, Recurring | Option contracts    
Fuel derivatives:    
Option contracts 134 223
Fair Value, Measurements, Recurring | Option contracts    
Liabilities    
Option contracts (2)  
Fair Value, Measurements, Recurring | Certificates of deposit    
Assets    
Certificates of deposit 189 203
Fair Value, Measurements, Recurring | Cash equivalents    
Assets    
Cash equivalents 8,111 9,032
Fair Value, Measurements, Recurring | Commercial paper    
Assets    
Cash equivalents 90 135
Fair Value, Measurements, Recurring | Certificates of deposit    
Assets    
Cash equivalents 2 21
Fair Value, Measurements, Recurring | Time deposits    
Assets    
Cash equivalents 300 100
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Treasury bills 690 1,983
Fuel derivatives:    
Equity Securities 354 280
Total assets 9,155 11,295
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Option contracts    
Fuel derivatives:    
Option contracts 0 0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Option contracts    
Liabilities    
Option contracts 0  
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Certificates of deposit    
Assets    
Certificates of deposit 0 0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Cash equivalents    
Assets    
Cash equivalents 8,111 9,032
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 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 581 459
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Option contracts    
Fuel derivatives:    
Option contracts 0 0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Option contracts    
Liabilities    
Option contracts 0  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Certificates of deposit    
Assets    
Certificates of deposit 189 203
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 90 135
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Certificates of deposit    
Assets    
Cash equivalents 2 21
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Time deposits    
Assets    
Cash equivalents 300 100
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Treasury bills 0 0
Fuel derivatives:    
Equity Securities 0 0
Total assets 134 223
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Option contracts    
Fuel derivatives:    
Option contracts 134 223
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Option contracts    
Liabilities    
Option contracts (2)  
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Certificates of deposit    
Assets    
Certificates of deposit 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 0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Time deposits    
Assets    
Cash equivalents $ 0 $ 0