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Financial Derivative Instruments - Fair Values by Balance Sheet Location (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] $ 627 $ 1,360
Derivative Liability, Fair Value, Gross Liability [1] 1,708 2,409
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 68 13
Derivative Liability, Fair Value, Gross Liability [1] 580 704
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 559 1,347
Derivative Liability, Fair Value, Gross Liability [1] 1,128 1,705
Fuel derivatives    
Derivatives, Fair Value [Line Items]    
Collateral Already Posted, Aggregate Fair Value 660  
Fuel derivatives | Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Collateral Already Posted, Aggregate Fair Value 202 68
Fuel derivatives | Accounts Payable Balance Sheet Location [Member]    
Derivatives, Fair Value [Line Items]    
Due To Third Parties For Settled Fuel Contracts 0 16
Fuel derivatives | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Collateral Already Posted, Aggregate Fair Value 458 198
Fuel derivatives | Designated as Hedging Instrument | Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 29 0
Derivative Liability, Fair Value, Gross Liability [1] 145 0
Fuel derivatives | Designated as Hedging Instrument | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 38 0
Derivative Liability, Fair Value, Gross Liability [1] 381 643
Fuel derivatives | Not Designated as Hedging Instrument | Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 408 1,190
Derivative Liability, Fair Value, Gross Liability [1] 811 1,432
Fuel derivatives | Not Designated as Hedging Instrument | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 151 157
Derivative Liability, Fair Value, Gross Liability [1] 317 273
Interest rate derivatives | Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 1 13
Derivative Liability, Fair Value, Gross Liability [1] 0 0
Interest rate derivatives | Designated as Hedging Instrument | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 0 0
Derivative Liability, Fair Value, Gross Liability [1] $ 54 $ 61
[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.