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Fair Value Measurements - Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset [1] $ 444 $ 1,937
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability [1] (805) (3,465)
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Treasury bills 1,345 1,248
Interest rate derivatives (see Note 10)   0
Fuel derivatives:    
Other available for sale securities 83 66
Total assets 2,772 2,651
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
Interest rate derivatives (see Note 10)   2
Fuel derivatives:    
Other available for sale securities 0 0
Total assets 658 1,437
Fuel derivatives:    
Interest rate derivatives (see Note 10) (35) (49)
Total Liabilities (145) (823)
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   27
Total assets 402 993
Fuel derivatives:    
Interest rate derivatives (see Note 10) 0 0
Total Liabilities (660) (2,642)
Cash Equivalents | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Cash equivalents [2] 1,344 1,337
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 325 200
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 11 13
Certificates of deposit | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Cash equivalents 0 0
Eurodollar Time Deposits | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Cash equivalents   0
Eurodollar Time Deposits | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Cash equivalents   33
Eurodollar Time Deposits | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Cash equivalents   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 280 220
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 0
Derivative Asset, Fair Value, Gross Asset [4]   0
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability [3] 0 0
Swap | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3] 42 931
Derivative Asset, Fair Value, Gross Asset [4]   38
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability [3] (110) (774)
Swap | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3] 0 0
Derivative Asset, Fair Value, Gross Asset [4]   0
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability [3] 0 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 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 0
Options Held | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3] 0 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 0
Options Held | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3] 163 956
Derivative Asset, Fair Value, Gross Asset [4] 239 10
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability [4] (96) (26)
Derivative Liability, Fair Value, Gross Liability [3] (564) (2,616)
Period end date | Fair Value, Measurements, Recurring    
Assets    
Treasury bills 1,345 1,248
Interest rate derivatives (see Note 10)   2
Fuel derivatives:    
Other available for sale securities 83 93
Total assets 3,832 5,081
Fuel derivatives:    
Interest rate derivatives (see Note 10) (35) (49)
Total Liabilities (805) (3,465)
Period end date | Cash Equivalents | Fair Value, Measurements, Recurring    
Assets    
Cash equivalents [2] 1,344 1,337
Period end date | Commercial paper | Fair Value, Measurements, Recurring    
Assets    
Cash equivalents 325 200
Period end date | Certificates of deposit | Fair Value, Measurements, Recurring    
Assets    
Cash equivalents 11 13
Period end date | Eurodollar Time Deposits | Fair Value, Measurements, Recurring    
Assets    
Cash equivalents   33
Period end date | Certificates of deposit | Fair Value, Measurements, Recurring    
Assets    
Investments 280 220
Period end date | Swap | Fair Value, Measurements, Recurring    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3] 42 931
Derivative Asset, Fair Value, Gross Asset [4]   38
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability [3] (110) (774)
Period end date | Options Held | Fair Value, Measurements, Recurring    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3] 163 956
Derivative Asset, Fair Value, Gross Asset [4] 239 10
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability [4] (96) (26)
Derivative Liability, Fair Value, Gross Liability [3] $ (564) $ (2,616)
[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.