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FINANCIAL DERIVATIVE INSTRUMENTS (Tables)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Notes to Financial Statements [Abstract]    
Volume of fuel hedging
  Fuel hedged as of  
  June 30, 2012 Hedged commodity type
Period (by year) (gallons in millions)(a) as of June 30, 2012
Remainder of 2012  427 WTI crude oil
2013  1,119 WTI crude and Brent crude oil
2014  1,171 WTI crude and Brent crude oil
2015  609 WTI crude and Brent crude oil
2016  277 Brent crude oil
     
(a) The Company determines gallons hedged based on market prices and forward curves as of June 30, 2012. Due to the types of derivatives utilized by the Company, these volumes may vary significantly as market prices fluctuate.
 
Schedule of derivative instruments in statement of financial position, fair value
    Asset derivatives  Liability derivatives
 Balance Sheet Fair value at  Fair value at  Fair value at Fair value at
(in millions) location 06/30/12 12/31/11 06/30/12 12/31/11
              
Derivatives designated as hedges*             
Fuel derivative contracts (gross)Other current assets $ 20 $ 17 $ 7 $ -
Fuel derivative contracts (gross)Other assets   47   542   8   107
Fuel derivative contracts (gross)Accrued liabilities   72   97   26   8
Fuel derivative contracts (gross)Other noncurrent liabilities   154   93   49   24
Interest rate derivative contractsOther assets   69   64   -   -
Interest rate derivative contractsAccrued liabilities   -   2   -   -
Interest rate derivative contractsOther noncurrent liabilities   -   -   128   132
              
Total derivatives designated as hedges $ 362 $ 815 $ 218 $ 271
              
Derivatives not designated as hedges*             
Fuel derivative contracts (gross)Other current assets $ 53 $ 124 $ 30 $ 58
Fuel derivative contracts (gross)Other assets   93   26   100   272
Fuel derivative contracts (gross)Accrued liabilities   229   326   442   687
Fuel derivative contracts (gross)Other noncurrent liabilities   164   9   310   122
              
Total derivatives not designated as hedges  $ 539 $ 485 $ 882 $ 1,139
              
Total derivatives  $ 901 $ 1,300 $ 1,100 $ 1,410
              
* 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.
  
Cash collateral deposits, due to/from third parties, and net unrealized gains/losses
   Balance Sheet June 30, December 31,
(in millions) location 2012 2011
Cash collateral deposits provided Offset against Other      
 to counterparties - noncurrent noncurrent liabilities $ 32 $ 41
Cash collateral deposits provided Offset against Accrued      
 to counterparties - current liabilities   135   185
Cash collateral deposits provided Accounts and other      
 to counterparties - current receivables   98   -
Due to third parties for fuel contracts Accrued liabilities   8   21
Receivable from third parties for Accounts and other      
 fuel contracts - current receivables   -   3
Receivable from third parties for        
 fuel contracts - noncurrent Other assets   54   -
  
Derivatives in cash flow hedging relationships
Derivatives in cash flow hedging relationships
  (Gain) loss  (Gain) loss (Gain) loss
  recognized in AOCI on  reclassified from AOCI recognized in income
  derivatives (effective  into income (effective on derivatives
  portion)   portion)(a)  (ineffective portion)(b)
  Three months ended Three months ended Three months ended
  June 30, June 30, June 30,
(in millions)2012 2011 2012 2011 2012 2011
                   
Fuel derivative                 
 contracts$ 279*$ 196*$ 28*$ 18*$ 8 $ 8
Interest rate                 
 derivatives  8*  11*  -   -   -   -
                   
Total$ 287 $ 207 $ 28 $ 18 $ 8 $ 8
                   
*Net of tax
(a) Amounts related to fuel derivative contracts and interest rate derivatives are included in Fuel and oil and Interest expense, respectively.
(b) Amounts are included in Other (gains) losses, net.
Derivatives in cash flow hedging relationships
  (Gain) loss  (Gain) loss (Gain) loss
  recognized in AOCI on  reclassified from AOCI recognized in income
  derivatives (effective  into income (effective on derivatives
  portion)   portion)(a)  (ineffective portion)(b)
  Six months ended Six months ended Six months ended
  June 30, June 30, June 30,
(in millions)2012 2011 2012 2011 2012 2011
                   
Fuel derivative                 
 contracts$ 143*$ (119)*$ 51*$ 34*$ 40 $ 42
Interest rate                 
 derivatives  2*  4*  -   -   -   -
                   
Total$ 145 $ (115) $ 51 $ 34 $ 40 $ 42
                   
*Net of tax
(a) Amounts related to fuel derivative contracts and interest rate derivatives are included in Fuel and oil and Interest expense, respectively.
(b) Amounts are included in Other (gains) losses, net.
Derivatives not in cash flow hedging relationships
Derivatives not in cash flow hedging relationships 
          
  (Gain) loss   
  recognized in income on   
   derivatives   
  Three months ended Location of (gain) loss 
  June 30, recognized in income 
(in millions) 2012 2011 on derivatives 
          
Fuel derivative contracts $ 40 $ (150) Other (gains) losses, net 
Derivatives not in cash flow hedging relationships 
          
  (Gain) loss   
  recognized in income on   
   derivatives   
  Six months ended Location of (gain) loss 
  June 30, recognized in income 
(in millions) 2012 2011 on derivatives 
          
Fuel derivative contracts $ (169) $ (155) Other (gains) losses, net 
Fair values of fuel derivatives, amounts posted as collateral, and collateral posting threshold amounts
  Counterparty (CP)    
  A B C D E Other(a) Total
(in millions)              
Fair value of fuel derivatives$(59) $(72) $(65) $(11) $64 $3 $ (140)
Cash collateral held from (by) CP  (100)  (129)  (36)  -  -  -  (265)
Aircraft collateral pledged to CP              
Letters of credit (LC)              
Option to substitute LC for aircraft (340) to  >(125)(d) N/A N/A N/A    
  (740)(d)            
               
Option to substitute LC for cash N/A N/A (100) to  N/A >(50)(e)    
      (150)(e)        
If credit rating is investment              
grade, fair value of fuel              
derivative level at which:              
Cash is provided to CP (40) to (340) 0 to (125) >(50) >(75) >(50)    
  or >(740) or >(625)          
Cash is received from CP >75 >150 >200(c) >125(c) >250    
Aircraft or cash can be pledged              
to CP as collateral (340) to  (125) to  N/A N/A N/A    
  (740)(d) (625)(d)          
If credit rating is non-investment              
grade, fair value of fuel derivative              
level at which:              
Cash is provided to CP (40) to (340) 0 to (125)  (b)  (b)  (b)    
  or >(740) or >(625)          
Cash is received from CP  (b)  (b)  (b)  (b)  (b)    
Aircraft can be pledged to CP              
as collateral (340) to  (125) to  N/A N/A N/A    
  (740) (625)          
               
(a) Individual counterparties with fair value of fuel derivatives <$15 million.
(b) Cash collateral is provided at 100 percent of fair value of fuel derivative contracts.
(c) Thresholds may vary based on changes in credit ratings within investment grade.
(d) The Company has the option of providing cash, letters of credit, or pledging aircraft as collateral. No letters of credit or aircraft were pledged as collateral with such counterparties as of June 30, 2012.
(e) The Company has the option of providing cash or letters of credit as collateral. No letters of credit were pledged as collateral with such counterparties as of June 30, 2012.