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Fair Value Measurements - Measured on Recurring Basis (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Assets    
Time Deposits $ 425,000,000  
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 134,000,000 $ 112,000,000
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability (6,000,000) (6,000,000)
Quoted prices in active markets for identical assets (Level 1)    
Assets    
Time Deposits 0  
Significant other observable inputs (Level 2)    
Assets    
Time Deposits 425,000,000  
Significant unobservable inputs (Level 3)    
Assets    
Time Deposits 0  
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Treasury bills 1,800,000,000 1,196,000,000
Interest rate derivatives (see Note 10)   0
Fuel derivatives:    
Other available for sale securities 259,000,000 [1] 197,000,000
Assets, Fair Value Disclosure 12,722,000,000 3,392,000,000
Fuel derivatives:    
Interest rate derivatives (see Note 11) 0 0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Treasury bills 0 0
Interest rate derivatives (see Note 10)   2,000,000
Fuel derivatives:    
Other available for sale securities 0 [1] 0
Assets, Fair Value Disclosure 871,000,000 879,000,000
Fuel derivatives:    
Interest rate derivatives (see Note 11) (6,000,000) (6,000,000)
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Treasury bills 0 0
Interest rate derivatives (see Note 10)   0
Fuel derivatives:    
Other available for sale securities 0 [1] 0
Assets, Fair Value Disclosure 134,000,000 110,000,000
Fuel derivatives:    
Interest rate derivatives (see Note 11) 0 0
Cash Equivalents | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Cash equivalents [2] 10,663,000,000 1,999,000,000
Cash Equivalents | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Cash equivalents [2] 0 0
Cash Equivalents | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Cash equivalents [2] 0 0
Commercial paper | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Cash equivalents 0 0
Commercial paper | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Cash equivalents 90,000,000 535,000,000
Commercial paper | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Cash equivalents 0 0
Certificates of deposit | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Cash equivalents 0 0
Investments   0
Certificates of deposit | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Cash equivalents 10,000,000 14,000,000
Investments   268,000,000
Certificates of deposit | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Cash equivalents 0 0
Investments   0
Time deposits | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Cash equivalents 0  
Investments   0
Time deposits | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Cash equivalents 300,000,000  
Investments   60,000,000
Time deposits | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Cash equivalents 0  
Investments   0
Certificates of deposit | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Investments 0  
Certificates of deposit | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Investments 46,000,000  
Certificates of deposit | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Investments 0  
Options Held | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset [3] 0 0
Options Held | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset [3] 0 0
Options Held | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset [3] 134,000,000 110,000,000
Period end date | Fair Value, Measurements, Recurring    
Assets    
Treasury bills 1,800,000,000 1,196,000,000
Interest rate derivatives (see Note 10)   2,000,000
Fuel derivatives:    
Other available for sale securities 259,000,000 [1] 197,000,000
Assets, Fair Value Disclosure 13,727,000,000 4,381,000,000
Fuel derivatives:    
Interest rate derivatives (see Note 11) (6,000,000) (6,000,000)
Period end date | Cash Equivalents | Fair Value, Measurements, Recurring    
Assets    
Cash equivalents [2] 10,663,000,000 1,999,000,000
Period end date | Commercial paper | Fair Value, Measurements, Recurring    
Assets    
Cash equivalents 90,000,000 535,000,000
Period end date | Certificates of deposit | Fair Value, Measurements, Recurring    
Assets    
Cash equivalents 10,000,000 14,000,000
Investments   268,000,000
Period end date | Time deposits | Fair Value, Measurements, Recurring    
Assets    
Cash equivalents 300,000,000  
Investments   60,000,000
Period end date | Certificates of deposit | Fair Value, Measurements, Recurring    
Assets    
Investments 46,000,000  
Period end date | Options Held | Fair Value, Measurements, Recurring    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset [3] $ 134,000,000 $ 110,000,000
[1] In the Consolidated Balance Sheet amounts are presented as an asset. See Note 11.
[2] Cash equivalents are primarily composed of money market investments.
[3] In the Consolidated Balance Sheet amounts are presented as an asset. See Note 11.