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Fair Value Measurements - Measured on Recurring Basis (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0 $ 0
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount 0 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0 0
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net 0 0
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability [1] (3,465) (2,409)
Fair Value, Measurements, Recurring | Period end date    
Assets    
Treasury bills 1,248 1,450
Interest rate derivatives (see Note 10) 2 13
Fuel derivatives:    
Other available for sale securities 93 95
Total assets 5,081 4,443
Fuel derivatives:    
Interest rate derivatives (see Note 10) (49) (61)
Total Liabilities (3,465) (2,409)
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Treasury bills 1,248 1,450
Interest rate derivatives (see Note 10) 0 0
Fuel derivatives:    
Other available for sale securities 66 63
Total assets 2,651 2,623
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 13
Fuel derivatives:    
Other available for sale securities 0 0
Total assets 1,437 896
Fuel derivatives:    
Interest rate derivatives (see Note 10) (49) (61)
Total Liabilities (823) (426)
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Treasury bills 0 0
Interest rate derivatives (see Note 10) 0 0
Fuel derivatives:    
Other available for sale securities 27 32
Total assets 993 924
Fuel derivatives:    
Interest rate derivatives (see Note 10) 0 0
Total Liabilities (2,642) (1,983)
Cash Equivalents | Fair Value, Measurements, Recurring | Period end date    
Assets    
Cash equivalents [2] 1,337 1,110
Cash Equivalents | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Cash equivalents [2] 1,337 1,110
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 | Period end date    
Assets    
Cash equivalents 200 70
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 200 70
Commercial paper | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Cash equivalents 0 0
Certificates of deposit | Fair Value, Measurements, Recurring | Period end date    
Assets    
Cash equivalents 13 4
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 13 4
Certificates of deposit | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Cash equivalents 0 0
Eurodollar Time Deposits | Fair Value, Measurements, Recurring | Period end date    
Assets    
Cash equivalents 33 98
Eurodollar Time Deposits | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Cash equivalents 0 0
Eurodollar Time Deposits | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Cash equivalents 33 98
Eurodollar Time Deposits | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Cash equivalents 0 0
Certificates of deposit | Fair Value, Measurements, Recurring | Period end date    
Assets    
Investments 220 256
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 220 256
Certificates of deposit | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Investments 0 0
Swap | Fair Value, Measurements, Recurring | Period end date    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3] 931 455
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability [3] (774) (365)
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
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] 931 455
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability [3] (774) (365)
Swap | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3] 0 0
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability [3] 0 0
Options Held | Fair Value, Measurements, Recurring | Period end date    
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Asset [3] 956 892
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability [4] (26)  
Derivative Liability, Fair Value, Gross Liability [3] (2,616) (1,983)
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
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability [4] 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
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability [4] 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] 956 892
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability [4] (26)  
Derivative Liability, Fair Value, Gross Liability [3] $ (2,616) $ (1,983)
[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.