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Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure $ 4,609  
Restricted Cash and Investments, Current 772 738
Fuel derivative contracts, Fair Value 24 97
Fair value of assets and liabilities measured on recurring basis 5,405  
Money Market Funds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 490 [1],[2]  
Government Agency Investments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 613 [1],[2]  
Repurchase Investments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 360 [1],[2]  
Corporate Obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 2,309 [1],[2]  
Bank Notes/Certificates Of Deposit/Time Deposits [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 837 [1],[2]  
Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 490  
Restricted Cash and Investments, Current 772 [2]  
Fuel derivative contracts, Fair Value 0 [2]  
Fair value of assets and liabilities measured on recurring basis 1,262  
Level 1 [Member] | Money Market Funds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 490 [1],[2]  
Level 1 [Member] | Government Agency Investments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [1],[2]  
Level 1 [Member] | Repurchase Investments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [1],[2]  
Level 1 [Member] | Corporate Obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure    [1],[2]  
Level 1 [Member] | Bank Notes/Certificates Of Deposit/Time Deposits [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure    [1],[2]  
Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 4,119  
Restricted Cash and Investments, Current 0 [1]  
Fuel derivative contracts, Fair Value 24 [2]  
Fair value of assets and liabilities measured on recurring basis 4,143  
Level 2 [Member] | Money Market Funds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [1],[2]  
Level 2 [Member] | Government Agency Investments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 613 [1],[2]  
Level 2 [Member] | Repurchase Investments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 360 [1],[2]  
Level 2 [Member] | Corporate Obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 2,309 [1],[2]  
Level 2 [Member] | Bank Notes/Certificates Of Deposit/Time Deposits [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 837 [1],[2]  
Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0  
Restricted Cash and Investments, Current 0 [2]  
Fuel derivative contracts, Fair Value 0 [2]  
Fair value of assets and liabilities measured on recurring basis 0 [1]  
Level 3 [Member] | Money Market Funds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [1],[2]  
Level 3 [Member] | Government Agency Investments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [1],[2]  
Level 3 [Member] | Repurchase Investments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [1],[2]  
Level 3 [Member] | Corporate Obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [1],[2]  
Level 3 [Member] | Bank Notes/Certificates Of Deposit/Time Deposits [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 0 [1],[2]  
Maturity Dates Exceeding One Year [Member] | Government Agency Investments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 613  
Maturity Dates Exceeding One Year [Member] | Corporate Obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 524  
Maturity Dates Exceeding One Year [Member] | Bank Notes/Certificates Of Deposit/Time Deposits [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Fair Value Disclosure $ 262  
[1] 2. The Company’s short-term investments mature in one year or less except for $262 million of Bank notes/Certificates of deposit/Time deposits, $613 million of U.S. Government agency investments and $524 million of Corporate obligations which have maturity dates exceeding one year.
[2] 1. Unrealized gains or losses on short-term investments, restricted cash and short-term investments and derivatives qualifying for hedge accounting are recorded in Accumulated other comprehensive income (loss) (OCI) at each measurement date.