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Fair Value Measurements - Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Assets    
Treasury bills $ 3,116 $ 2,226
Fuel derivatives:    
Interest rate derivatives (see Note 3) 13 14
Equity Securities 236 235
Total assets 12,318 13,053
Options Contracts    
Fuel derivatives:    
Option contracts 395 512
Certificates of deposit    
Assets    
Investments 150 124
Time deposits    
Assets    
Investments 49 450
Cash Equivalents    
Assets    
Cash equivalents 7,497 9,040
Commercial paper    
Assets    
Cash equivalents 224 179
Certificates of deposit    
Assets    
Cash equivalents 13 23
Time deposits    
Assets    
Cash equivalents 625 250
Quoted prices in active markets for identical assets (Level 1)    
Assets    
Treasury bills 3,116 2,226
Fuel derivatives:    
Interest rate derivatives (see Note 3) 0 0
Equity Securities 236 235
Total assets 10,849 11,501
Quoted prices in active markets for identical assets (Level 1) | Options Contracts    
Fuel derivatives:    
Option contracts 0 0
Quoted prices in active markets for identical assets (Level 1) | Certificates of deposit    
Assets    
Investments 0 0
Quoted prices in active markets for identical assets (Level 1) | Time deposits    
Assets    
Investments 0 0
Quoted prices in active markets for identical assets (Level 1) | Cash Equivalents    
Assets    
Cash equivalents 7,497 9,040
Quoted prices in active markets for identical assets (Level 1) | Commercial paper    
Assets    
Cash equivalents 0 0
Quoted prices in active markets for identical assets (Level 1) | Certificates of deposit    
Assets    
Cash equivalents 0 0
Quoted prices in active markets for identical assets (Level 1) | Time deposits    
Assets    
Cash equivalents 0 0
Significant other observable inputs (Level 2)    
Assets    
Treasury bills 0 0
Fuel derivatives:    
Interest rate derivatives (see Note 3) 13 14
Equity Securities 0 0
Total assets 1,074 1,040
Significant other observable inputs (Level 2) | Options Contracts    
Fuel derivatives:    
Option contracts 0 0
Significant other observable inputs (Level 2) | Certificates of deposit    
Assets    
Investments 150 124
Significant other observable inputs (Level 2) | Time deposits    
Assets    
Investments 49 450
Significant other observable inputs (Level 2) | Cash Equivalents    
Assets    
Cash equivalents 0 0
Significant other observable inputs (Level 2) | Commercial paper    
Assets    
Cash equivalents 224 179
Significant other observable inputs (Level 2) | Certificates of deposit    
Assets    
Cash equivalents 13 23
Significant other observable inputs (Level 2) | Time deposits    
Assets    
Cash equivalents 625 250
Significant unobservable inputs (Level 3)    
Assets    
Treasury bills 0 0
Fuel derivatives:    
Interest rate derivatives (see Note 3) 0 0
Equity Securities 0 0
Total assets 395 512
Significant unobservable inputs (Level 3) | Options Contracts    
Fuel derivatives:    
Option contracts 395 512
Significant unobservable inputs (Level 3) | Certificates of deposit    
Assets    
Investments 0 0
Significant unobservable inputs (Level 3) | Time deposits    
Assets    
Investments 0 0
Significant unobservable inputs (Level 3) | Cash Equivalents    
Assets    
Cash equivalents 0 0
Significant unobservable inputs (Level 3) | Commercial paper    
Assets    
Cash equivalents 0 0
Significant unobservable inputs (Level 3) | Certificates of deposit    
Assets    
Cash equivalents 0 0
Significant unobservable inputs (Level 3) | Time deposits    
Assets    
Cash equivalents $ 0 $ 0