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Fair Value Measurements - Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset [1] $ 283 $ 444
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability [1] (57) (805)
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Treasury bills 1,491 1,345
Fuel derivatives:    
Other available for sale securities 107 83
Total assets 2,731 2,772
Fuel derivatives:    
Interest rate derivatives (see Note 10) 0 0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Treasury bills 0 0
Fuel derivatives:    
Other available for sale securities 0 0
Total assets 649 658
Fuel derivatives:    
Interest rate derivatives (see Note 10) (22) (35)
Total Liabilities (22) (145)
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Treasury bills 0 0
Fuel derivatives:    
Total assets 283 402
Fuel derivatives:    
Interest rate derivatives (see Note 10) 0 0
Total Liabilities (35) (660)
Cash Equivalents | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Cash equivalents [2] 1,133 1,344
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 350 325
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
Certificates of deposit | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Cash equivalents 12 11
Certificates of deposit | 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    
Investments 0 0
Certificates of deposit | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Investments 287 280
Certificates of deposit | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Investments 0 0
Swap | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3]   0
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability [3]   0
Swap | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3]   42
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability [3]   (110)
Swap | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3]   0
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability [3]   0
Options Held | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3]   0
Derivative Asset, Fair Value, Gross Asset [4] 0 0
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability [4] 0 0
Derivative Liability, Fair Value, Gross Liability [3]   0
Options Held | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3]   0
Derivative Asset, Fair Value, Gross Asset [4] 0 0
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability [4] 0 0
Derivative Liability, Fair Value, Gross Liability [3]   0
Options Held | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3]   163
Derivative Asset, Fair Value, Gross Asset [4] 283 239
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability [4] (35) (96)
Derivative Liability, Fair Value, Gross Liability [3]   (564)
Period end date | Fair Value, Measurements, Recurring    
Assets    
Treasury bills 1,491 1,345
Fuel derivatives:    
Other available for sale securities 107 83
Total assets 3,663 3,832
Fuel derivatives:    
Interest rate derivatives (see Note 10) (22) (35)
Total Liabilities (57) (805)
Period end date | Cash Equivalents | Fair Value, Measurements, Recurring    
Assets    
Cash equivalents [2] 1,133 1,344
Period end date | Commercial paper | Fair Value, Measurements, Recurring    
Assets    
Cash equivalents 350 325
Period end date | Certificates of deposit | Fair Value, Measurements, Recurring    
Assets    
Cash equivalents 12 11
Period end date | Certificates of deposit | Fair Value, Measurements, Recurring    
Assets    
Investments 287 280
Period end date | Swap | Fair Value, Measurements, Recurring    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3]   42
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability [3]   (110)
Period end date | Options Held | Fair Value, Measurements, Recurring    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3]   163
Derivative Asset, Fair Value, Gross Asset [4] 283 239
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability [4] $ (35) (96)
Derivative Liability, Fair Value, Gross Liability [3]   $ (564)
[1] Represents the position of each trade before consideration of offsetting positions with each counterparty and does not include the impact of cash collateral deposits provided to or received from counterparties. See discussion of credit risk and collateral following in this Note.
[2] Cash equivalents are primarily composed of money market investments.
[3] In the Consolidated Balance Sheet amounts are presented as a net liability. See Note 10.
[4] In the Consolidated Balance Sheet amounts are presented as a net asset. See Note 10.