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Fair Value Measurements - Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Quoted prices in active markets for identical assets (Level 1)    
Assets    
Treasury bills $ 1,195,000,000 $ 1,582,000,000
Interest rate derivatives (see Note 3) 0  
Fuel derivatives:    
Other available for sale securities 178,000,000 127,000,000
Total assets 3,451,000,000 3,101,000,000
Liabilities    
Interest rate derivatives (see Note 3) 0 0
Significant other observable inputs (Level 2)    
Assets    
Treasury bills 0 0
Interest rate derivatives (see Note 3) 1,000,000  
Fuel derivatives:    
Other available for sale securities 0 0
Total assets 744,000,000 715,000,000
Liabilities    
Interest rate derivatives (see Note 3) (24,000,000) (14,000,000)
Significant unobservable inputs (Level 3)    
Assets    
Treasury bills 0 0
Interest rate derivatives (see Note 3) 0  
Fuel derivatives:    
Other available for sale securities 0 0
Total assets 114,000,000 138,000,000
Liabilities    
Interest rate derivatives (see Note 3) 0 0
Options Held | Quoted prices in active markets for identical assets (Level 1)    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 0 [1] 0 [2]
Options Held | Significant other observable inputs (Level 2)    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 0 [1] 0 [2]
Options Held | Significant unobservable inputs (Level 3)    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 114,000,000 [1] 138,000,000 [2]
Cash Equivalents | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Cash equivalents 2,078,000,000 [3] 1,392,000,000 [4]
Cash Equivalents | Significant other observable inputs (Level 2)    
Assets    
Cash equivalents 0 [3] 0 [4]
Cash Equivalents | Significant unobservable inputs (Level 3)    
Assets    
Cash equivalents 0 [3] 0 [4]
Commercial Paper | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Cash equivalents 0 0
Commercial Paper | Significant other observable inputs (Level 2)    
Assets    
Cash equivalents 405,000,000 454,000,000
Commercial Paper | Significant unobservable inputs (Level 3)    
Assets    
Cash equivalents 0 0
Certificates of Deposit | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Cash equivalents 0 0
Investments 0 0
Certificates of Deposit | Significant other observable inputs (Level 2)    
Assets    
Cash equivalents 5,000,000 8,000,000
Investments 274,000,000 228,000,000
Certificates of Deposit | Significant unobservable inputs (Level 3)    
Assets    
Cash equivalents 0 0
Investments 0 0
Time Deposits | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Investments 0 0
Time Deposits | Significant other observable inputs (Level 2)    
Assets    
Investments 59,000,000 25,000,000
Time Deposits | Significant unobservable inputs (Level 3)    
Assets    
Investments 0 0
Estimate of Fair Value Measurement    
Assets    
Treasury bills 1,195,000,000 1,582,000,000
Interest rate derivatives (see Note 3) 1,000,000  
Fuel derivatives:    
Other available for sale securities 178,000,000 127,000,000
Total assets 4,309,000,000 3,954,000,000
Liabilities    
Interest rate derivatives (see Note 3) (24,000,000) (14,000,000)
Estimate of Fair Value Measurement | Options Held    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 114,000,000 [1] 138,000,000 [2]
Estimate of Fair Value Measurement | Cash Equivalents    
Assets    
Cash equivalents 2,078,000,000 [3] 1,392,000,000 [4]
Estimate of Fair Value Measurement | Commercial Paper    
Assets    
Cash equivalents 405,000,000 454,000,000
Estimate of Fair Value Measurement | Certificates of Deposit    
Assets    
Cash equivalents 5,000,000 8,000,000
Investments 274,000,000 228,000,000
Estimate of Fair Value Measurement | Time Deposits    
Assets    
Investments $ 59,000,000 $ 25,000,000
[1] In the unaudited Condensed Consolidated Balance Sheet amounts are presented as an asset. See Note 3.


[2] In the unaudited Condensed Consolidated Balance Sheet amounts are presented as a net asset. See Note 3.

[3] Cash equivalents are primarily composed of money market investments.
[4] Cash equivalents are primarily composed of money market investments.