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Fair Value Measurements - Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Quoted prices in active markets for identical assets (Level 1)    
Assets    
Treasury bills $ 1,291 $ 1,582
Interest rate derivatives (see Note 3) 0  
Fuel derivatives:    
Other available for sale securities 172 127
Total assets 3,579 3,101
Liabilities    
Interest rate derivatives (see Note 3) 0 0
Significant other observable inputs (Level 2)    
Assets    
Treasury bills 0 0
Fuel derivatives:    
Other available for sale securities 0 0
Total assets 579 715
Liabilities    
Interest rate derivatives (see Note 3) (37) (14)
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 187 138
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 187 [1] 138 [2]
Cash Equivalents | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Cash equivalents 2,116 [3] 1,392 [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 295 454
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 10 8
Investments 224 228
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    
Cash equivalents 0 0
Time Deposits | Significant other observable inputs (Level 2)    
Assets    
Cash equivalents 25 25
Time Deposits | Significant unobservable inputs (Level 3)    
Assets    
Cash equivalents 0 0
Estimate of Fair Value Measurement    
Assets    
Treasury bills 1,291 1,582
Fuel derivatives:    
Other available for sale securities 172 127
Total assets 4,345 3,954
Liabilities    
Interest rate derivatives (see Note 3) (37) (14)
Estimate of Fair Value Measurement | Options Held    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 187 [1] 138 [2]
Estimate of Fair Value Measurement | Cash Equivalents    
Assets    
Cash equivalents 2,116 [3] 1,392 [4]
Estimate of Fair Value Measurement | Commercial Paper    
Assets    
Cash equivalents 295 454
Estimate of Fair Value Measurement | Certificates of Deposit    
Assets    
Cash equivalents 10 8
Investments 224 228
Estimate of Fair Value Measurement | Time Deposits    
Assets    
Cash equivalents $ 25 $ 25
[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.