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Fair Value Measurements - Measured on Recurring Basis (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset $ 524 [1] $ 1,004 [1]
Fuel derivatives:    
Derivative Liability, Fair Value, Gross Liability (502) [1] (880) [1]
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 1,760 1,624
Interest rate derivatives (see Note 5) 22 31
Other available for sale securities 58 49
Total assets 3,948 4,059
Liabilities    
Interest rate derivatives (see Note 5) (87) (126)
Deferred Compensation (149) (137)
Total Liabilities (650) (1,017)
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
    
Assets    
Treasury bills 1,760 1,624
Interest rate derivatives (see Note 5) 0 0
Other available for sale securities 53 44
Total assets 2,920 2,497
Liabilities    
Interest rate derivatives (see Note 5) 0 0
Deferred Compensation (149) (137)
Total Liabilities (149) (137)
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
    
Assets    
Treasury bills 0 0
Interest rate derivatives (see Note 5) 22 31
Other available for sale securities 0 0
Total assets 529 661
Liabilities    
Interest rate derivatives (see Note 5) (87) (126)
Deferred Compensation 0 0
Total Liabilities (125) (239)
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
    
Assets    
Treasury bills 0 0
Interest rate derivatives (see Note 5) 0 0
Other available for sale securities 5 5
Total assets 499 901
Liabilities    
Interest rate derivatives (see Note 5) 0 0
Deferred Compensation 0 0
Total Liabilities (376) (641)
Cash Equivalents | Fair Value, Measurements, Recurring | Period end date
    
Assets    
Cash equivalents 1,107 [2] 829 [2]
Cash Equivalents | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
    
Assets    
Cash equivalents 1,107 [2] 829 [2]
Cash Equivalents | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
    
Assets    
Cash equivalents 0 [2] 0 [2]
Cash Equivalents | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
    
Assets    
Cash equivalents 0 [2] 0 [2]
Commercial paper | Fair Value, Measurements, Recurring | Period end date
    
Assets    
Cash equivalents 215 170
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 215 170
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 11 34
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 11 34
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   80
Eurodollar Time Deposits | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
    
Assets    
Cash equivalents   0
Eurodollar Time Deposits | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
    
Assets    
Cash equivalents   80
Eurodollar Time Deposits | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
    
Assets    
Cash equivalents   0
Certificates of deposit | Fair Value, Measurements, Recurring | Period end date
    
Assets    
Investments 235 233
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 235 233
Certificates of deposit | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
    
Assets    
Investments 0 0
Auction rate securities | Fair Value, Measurements, Recurring | Period end date
    
Assets    
Investments 39 [3] 36 [3]
Auction rate securities | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
    
Assets    
Investments 0 [3] 0 [3]
Auction rate securities | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
    
Assets    
Investments 0 [3] 0 [3]
Auction rate securities | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
    
Assets    
Investments 39 [3] 36 [3]
Swap | Fair Value, Measurements, Recurring | Period end date
    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 46 [4] 113 [5]
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability (38) [4] (57) [5]
Derivative Liability, Fair Value, Gross Liability   (56) [6]
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]
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability 0 [4] 0 [5]
Derivative Liability, Fair Value, Gross Liability   0 [6]
Swap | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 46 [4] 113 [5]
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability (38) [4] (57) [5]
Derivative Liability, Fair Value, Gross Liability   (56) [6]
Swap | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 0 [4] 0 [5]
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability 0 [4] 0 [5]
Derivative Liability, Fair Value, Gross Liability   0 [6]
Options Held | Fair Value, Measurements, Recurring | Period end date
    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 435 [4] 850 [5]
Derivative Liability, Fair Value, Gross Asset 20 [4] 10 [6]
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability (335) [4] (637) [5]
Derivative Liability, Fair Value, Gross Liability (41) [4] (4) [6]
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 [4] 0 [6]
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability 0 [4] 0 [5]
Derivative Liability, Fair Value, Gross Liability 0 [4] 0 [6]
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 [4] 0 [6]
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability 0 [4] 0 [5]
Derivative Liability, Fair Value, Gross Liability 0 [4] 0 [6]
Options Held | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
    
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Asset 435 [4] 850 [5]
Derivative Liability, Fair Value, Gross Asset 20 [4] 10 [6]
Fuel derivatives:    
Derivative Asset, Fair Value, Gross Liability (335) [4] (637) [5]
Derivative Liability, Fair Value, Gross Liability $ (41) [4] $ (4) [6]
[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] Noncurrent investments are included in Other assets in the unaudited Condensed Consolidated Balance Sheet.
[4]
[5] In the unaudited Condensed Consolidated Balance Sheet amounts are presented as a net asset. See Note 5.
[6] In the unaudited Condensed Consolidated Balance Sheet amounts are presented as a net liability. See Note 5.