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Financial Derivative Instruments Narrative (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Fuel derivatives
Sep. 30, 2014
Fuel derivatives
Sep. 30, 2014
Cash Flow Hedging
Sep. 30, 2013
Cash Flow Hedging
Sep. 30, 2014
Cash Flow Hedging
Sep. 30, 2013
Cash Flow Hedging
Sep. 30, 2014
Cash Flow Hedging
Fuel derivatives
Sep. 30, 2013
Cash Flow Hedging
Fuel derivatives
Sep. 30, 2014
Cash Flow Hedging
Fuel derivatives
Sep. 30, 2013
Cash Flow Hedging
Fuel derivatives
Sep. 30, 2014
Cash Flow Hedging
Interest rate derivatives
Sep. 30, 2013
Cash Flow Hedging
Interest rate derivatives
Sep. 30, 2014
Cash Flow Hedging
Interest rate derivatives
Sep. 30, 2013
Cash Flow Hedging
Interest rate derivatives
Sep. 30, 2014
Remainder of 2014
Sep. 30, 2014
Other Noncurrent Liabilities
Interest rate derivatives
Dec. 31, 2013
Other Noncurrent Liabilities
Interest rate derivatives
Derivative [Line Items]                                          
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage 62.00%   62.00%                               31.00%    
GainLossOnDerivativeNetDueToLossOfHedgeAccounting         $ 12 $ 8                              
Sublease Rollforward    
(in millions)
 
B717 lease/sublease liability
Balance at December 31, 2012
 
$
128

Lease/sublease accretion
 
6

Lease/sublease payments, net (a)
 
(12
)
Balance at December 31, 2013
 
$
122

Lease/sublease accretion
 
4

Lease/sublease expense adjustment
 
19

Lease/sublease payments, net (a)
 
(66
)
Balance at September 30, 2014
 
$
79


(a) Includes lease conversion cost payments

                                    
Cash collateral deposits provided to counterparty - noncurrent                                       24 32
Premiums paid for fuel derivative contracts 15 22 49 39                                  
Current Unrealized Net Gains (Losses) in OCI (72)   (72)                                    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net             (8) [1] (28) [1] (13) [1] (102) [1] (4) [1],[2] (24) [1],[2] (3) [1],[2] (88) [1],[2] (4) [1],[2] (4) [1],[2] (10) [1],[2] (14) [1],[2]      
Maximum sum of derivatives of counterparty to be included in other (less than $20 million) $ 10   $ 10                                    
Cash collateral provided as a percentage of derivative contract value (in hundredths) 100.00%   100.00%                                    
[1] Amounts related to fuel derivative contracts and interest rate derivatives are included in Fuel and oil and Interest expense, respectively.
[2] Net of tax