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Fair Value Measurements - Measured on Recurring Basis (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset [1] $ 1,437 $ 1,937
Total gains or (losses) (realized or unrealized)    
Included in earnings 34  
Included in other comprehensive income (53)  
Purchases 71  
Accounts payable trade 191 178
Sales (29)  
Settlements (239)  
The amount of total losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at March 31, 2016 21  
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability [1] (2,875) (3,465)
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
Fair Value, Measurements, Recurring | Period end date    
Assets    
Treasury bills 968 1,248
Interest rate derivatives (see Note 3) 16 2
Fuel derivatives:    
Other available for sale securities 89 93
Total gains or (losses) (realized or unrealized)    
Total assets 5,108 5,081
Liabilities    
Interest rate derivatives (see Note 3) (46) (49)
Total Liabilities (2,875) (3,465)
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Treasury bills 968 1,248
Interest rate derivatives (see Note 3) 0 0
Fuel derivatives:    
Other available for sale securities 63 66
Total gains or (losses) (realized or unrealized)    
Total assets 3,214 2,651
Liabilities    
Interest rate derivatives (see Note 3) 0 0
Total Liabilities 0 0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Treasury bills 0 0
Interest rate derivatives (see Note 3) 16 2
Fuel derivatives:    
Other available for sale securities 0 0
Total gains or (losses) (realized or unrealized)    
Total assets 1,119 1,437
Liabilities    
Interest rate derivatives (see Note 3) (46) (49)
Total Liabilities (645) (823)
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Treasury bills 0 0
Interest rate derivatives (see Note 3) 0 0
Fuel derivatives:    
Other available for sale securities 26 27
Total gains or (losses) (realized or unrealized)    
Total assets 775 993
Liabilities    
Interest rate derivatives (see Note 3) 0 0
Total Liabilities (2,230) (2,642)
Cash Equivalents | Fair Value, Measurements, Recurring | Period end date    
Assets    
Cash equivalents 2,183 [2] 1,337 [3]
Cash Equivalents | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Cash equivalents 2,183 [2] 1,337 [3]
Cash Equivalents | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Assets    
Cash equivalents 0 [2] 0 [3]
Cash Equivalents | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Assets    
Cash equivalents 0 [2] 0 [3]
Commercial paper | Fair Value, Measurements, Recurring | Period end date    
Assets    
Cash equivalents 125 200
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 125 200
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 10 13
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 10 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 | Period end date    
Assets    
Cash equivalents 70 33
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 70 33
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 226 220
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 226 220
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 Asset, Fair Value, Gross Asset 28 [4] 38 [5]
Derivative Liability, Fair Value, Gross Asset 644 [6] 931 [7]
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability (599) [6] (774) [7]
Swap | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 0 [4] 0 [5]
Derivative Liability, Fair Value, Gross Asset 0 [6] 0 [7]
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability 0 [6] 0 [7]
Swap | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 28 [4] 38 [5]
Derivative Liability, Fair Value, Gross Asset 644 [6] 931 [7]
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability (599) [6] (774) [7]
Swap | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 0 [4] 0 [5]
Derivative Liability, Fair Value, Gross Asset 0 [6] 0 [7]
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability 0 [6] 0 [7]
Options Held | Fair Value, Measurements, Recurring | Period end date    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 47 [4] 10 [5]
Derivative Liability, Fair Value, Gross Asset 702 [6] 956 [7]
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability (45) [4] (26) [5]
Derivative Liability, Fair Value, Gross Liability (2,185) [6] (2,616) [7]
Options Held | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 0 [4] 0 [5]
Derivative Liability, Fair Value, Gross Asset 0 [6] 0 [7]
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability 0 [4] 0 [5]
Derivative Liability, Fair Value, Gross Liability 0 [6] 0 [7]
Options Held | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 0 [4] 0 [5]
Derivative Liability, Fair Value, Gross Asset 0 [6] 0 [7]
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability 0 [4] 0 [5]
Derivative Liability, Fair Value, Gross Liability 0 [6] 0 [7]
Options Held | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 47 [4] 10 [5]
Derivative Liability, Fair Value, Gross Asset 702 [6] 956 [7]
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability (45) [4] (26) [5]
Derivative Liability, Fair Value, Gross Liability $ (2,185) [6] $ (2,616) [7]
[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] Cash equivalents are primarily composed of money market investments.
[4] In the unaudited Condensed Consolidated Balance Sheet amounts are presented as a net asset. See Note 3.
[5] In the unaudited Consolidated Balance Sheet amounts are presented as a net asset. See Note 3.
[6] In the unaudited Condensed Consolidated Balance Sheet amounts are presented as a net liability. See Note 3.
[7] In the unaudited Consolidated Balance Sheet amounts are presented as a net liability. See Note 3.