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Fair Value Measurements - Measured on Recurring Basis (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset $ 109,000,000 $ 112,000,000
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability (39,000,000) (6,000,000)
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 4)   0
Fuel derivatives:    
Other available for sale securities 228,000,000 197,000,000
Total assets 13,865,000,000 3,392,000,000
Liabilities    
Interest rate derivatives (see Note 4) 0 0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Treasury bills 0 0
Interest rate derivatives (see Note 4)   2,000,000
Fuel derivatives:    
Other available for sale securities 0 0
Total assets 925,000,000 879,000,000
Liabilities    
Interest rate derivatives (see Note 4) (39,000,000) (6,000,000)
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Treasury bills 0 0
Interest rate derivatives (see Note 4)   0
Fuel derivatives:    
Other available for sale securities 0 0
Total assets 109,000,000 110,000,000
Liabilities    
Interest rate derivatives (see Note 4)   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 [1] 0 0
Options Held | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset [1] 0 0
Options Held | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset [1] 109,000,000 110,000,000
Cash Equivalents | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Cash equivalents [2] 11,837,000,000 1,999,000,000
Cash Equivalents | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Cash equivalents [2]   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 135,000,000 535,000,000
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 0
Certificates of Deposit | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Cash equivalents 12,000,000 14,000,000
Investments 103,000,000 268,000,000
Certificates of Deposit | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Cash equivalents 0 0
Investments 0 0
Time Deposits | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Cash equivalents 0  
Investments 0 0
Time Deposits | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Cash equivalents 125,000,000  
Investments 550,000,000 60,000,000
Time Deposits | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Cash equivalents 0  
Investments 0 0
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring    
Assets    
Treasury bills 1,800,000,000 1,196,000,000
Interest rate derivatives (see Note 4)   2,000,000
Fuel derivatives:    
Other available for sale securities 228,000,000 197,000,000
Total assets 14,899,000,000 4,381,000,000
Liabilities    
Interest rate derivatives (see Note 4) (39,000,000) (6,000,000)
Estimate of Fair Value Measurement | Options Held | Fair Value, Measurements, Recurring    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset [1] 109,000,000 110,000,000
Estimate of Fair Value Measurement | Cash Equivalents | Fair Value, Measurements, Recurring    
Assets    
Cash equivalents [2] 11,837,000,000 1,999,000,000
Estimate of Fair Value Measurement | Commercial Paper | Fair Value, Measurements, Recurring    
Assets    
Cash equivalents 135,000,000 535,000,000
Estimate of Fair Value Measurement | Certificates of Deposit | Fair Value, Measurements, Recurring    
Assets    
Cash equivalents 12,000,000 14,000,000
Investments 103,000,000 268,000,000
Estimate of Fair Value Measurement | Time Deposits | Fair Value, Measurements, Recurring    
Assets    
Cash equivalents 125,000,000  
Investments $ 550,000,000 $ 60,000,000
[1] In the unaudited Condensed Consolidated Balance Sheet amounts are presented as a net asset. See Note 4.
[2] Cash equivalents are primarily composed of money market investments.