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Financial Derivative Instruments - Fair Values by Balance Sheet Location (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] $ 790 $ 1,937
Derivative Liability, Fair Value, Gross Liability [1] 1,770 3,465
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 151 168
Derivative Liability, Fair Value, Gross Liability [1] 788 1,233
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 639 1,769
Derivative Liability, Fair Value, Gross Liability [1] 982 2,232
Fuel derivatives    
Derivatives, Fair Value [Line Items]    
Collateral Already Posted, Aggregate Fair Value 719  
Fuel derivatives | Prepaid expenses and other current assets    
Derivatives, Fair Value [Line Items]    
Total Collateral Already Received Aggregate Fair Value 9 0
Fuel derivatives | Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Collateral Already Posted, Aggregate Fair Value 529 235
Fuel derivatives | Accounts Payable    
Derivatives, Fair Value [Line Items]    
Due To Third Parties For Settled Fuel Contracts 45 46
Fuel derivatives | Other Assets    
Derivatives, Fair Value [Line Items]    
Total Collateral Already Received Aggregate Fair Value 11 0
Fuel derivatives | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Collateral Already Posted, Aggregate Fair Value 210 600
Fuel derivatives | Designated as Hedging Instrument | Prepaid expenses and other current assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 1 2
Derivative Asset, Fair Value, Gross Liability [1] 0 0
Fuel derivatives | Designated as Hedging Instrument | Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Asset [1] 29 107
Derivative Liability, Fair Value, Gross Liability [1] 466 526
Fuel derivatives | Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 6 2
Derivative Asset, Fair Value, Gross Liability [1] 0 0
Fuel derivatives | Designated as Hedging Instrument | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Asset [1] 94 55
Derivative Liability, Fair Value, Gross Liability [1] 278 658
Fuel derivatives | Not Designated as Hedging Instrument | Prepaid expenses and other current assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 18 39
Derivative Asset, Fair Value, Gross Liability [1] 10 26
Fuel derivatives | Not Designated as Hedging Instrument | Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Asset [1] 399 1,395
Derivative Liability, Fair Value, Gross Liability [1] 756 1,854
Fuel derivatives | Not Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 5 5
Derivative Asset, Fair Value, Gross Liability [1] 0 0
Fuel derivatives | Not Designated as Hedging Instrument | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Asset [1] 217 330
Derivative Liability, Fair Value, Gross Liability [1] 216 352
Interest rate derivatives | Designated as Hedging Instrument | Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1] 21 2
Derivative Asset, Fair Value, Gross Liability [1] 0 0
Interest rate derivatives | Designated as Hedging Instrument | Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Asset [1] 0 0
Derivative Liability, Fair Value, Gross Liability [1] $ 44 $ 49
[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.