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Financial Derivative Instruments - Fair Values of Fuel Derivatives Amounts Posted as Collateral (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Maximum Sum Of Derivatives Of Counterparty To Be Included In Other $ 10,000,000  
If credit rating is non-investment grade, fair value of fuel derivative level at which:    
Cash Collateral Percent Of Fair Value Fuel Derivatives Contracts 100.00%  
Letter of Credit Percent of Collateral 100.00%  
Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives $ (1,481,000,000)  
Total collateral already posted aggregate fair value 835,000,000 $ 266,000,000
Aircraft collateral pledged to CP (250,000,000)  
Letters of credit (LC) 0  
Counterparty A | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives (562,000,000)  
Cash collateral held by CP (284,000,000)  
Aircraft collateral pledged to CP (250,000,000)  
Letters of credit (LC) 0  
Counterparty B | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives (201,000,000)  
Cash collateral held by CP (159,000,000)  
Aircraft collateral pledged to CP 0  
Letters of credit (LC) 0  
Counterparty C | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives (176,000,000)  
Cash collateral held by CP (56,000,000)  
Aircraft collateral pledged to CP 0  
Letters of credit (LC) 0  
Counterparty D | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives (411,000,000)  
Cash collateral held by CP (299,000,000)  
Aircraft collateral pledged to CP 0  
Letters of credit (LC) 0  
Counterparty E | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives (159,000,000)  
Cash collateral held by CP (37,000,000)  
Aircraft collateral pledged to CP 0  
Letters of credit (LC) 0  
Counterparty F | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives 20,000,000  
Cash collateral held by CP 0  
Aircraft collateral pledged to CP 0  
Letters of credit (LC) 0  
Counterparty Other | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives [1] 8,000,000  
Cash collateral held by CP [1] 0  
Aircraft collateral pledged to CP [1] 0  
Letters of credit (LC) [1] 0  
Minimum | Counterparty A | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Option to substitute LC for aircraft [2] $ (200,000,000)  
Option to substitute LC for cash Threshold 1  
If credit rating is investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 $ (50,000,000)  
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 (600,000,000)  
Fair value of fuel derivative level at which cash is received from CP 50,000,000  
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP [3] (200,000,000)  
If credit rating is non-investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 0  
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 $ (600,000,000)  
Fair value of fuel derivative level at which cash is received from CP [4]  
Fair value of fuel derivative levels at which aircraft collateral is pledged to CP $ (200,000,000)  
Minimum | Counterparty B | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Option to substitute LC for aircraft [5] (100,000,000)  
Option to substitute LC for cash Threshold 1 [6] (500,000,000)  
If credit rating is investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 (50,000,000)  
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 (500,000,000)  
Fair value of fuel derivative level at which cash is received from CP 150,000,000  
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP [5] (100,000,000)  
If credit rating is non-investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 0  
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 $ (500,000,000)  
Fair value of fuel derivative level at which cash is received from CP [4]  
Fair value of fuel derivative levels at which aircraft collateral is pledged to CP $ (100,000,000)  
Minimum | Counterparty C | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Option to substitute LC for cash Threshold 1 [6] (225,000,000)  
If credit rating is investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 (125,000,000)  
Fair value of fuel derivative level at which cash is received from CP [7] $ 175,000,000  
If credit rating is non-investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 [4]  
Fair value of fuel derivative level at which cash is received from CP [4]  
Minimum | Counterparty D | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Option to substitute LC for aircraft [5] $ (150,000,000)  
Option to substitute LC for cash Threshold 1 [6] (75,000,000)  
Option to substitute LC for cash Threshold 2 [6] (550,000,000)  
If credit rating is investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 (75,000,000)  
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 (550,000,000)  
Fair value of fuel derivative level at which cash is received from CP 250,000,000  
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP [5] (150,000,000)  
If credit rating is non-investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 0  
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 $ (550,000,000)  
Fair value of fuel derivative level at which cash is received from CP [4]  
Fair value of fuel derivative levels at which aircraft collateral is pledged to CP $ (150,000,000)  
Minimum | Counterparty E | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Option to substitute LC for aircraft [5] (150,000,000)  
Option to substitute LC for cash Threshold 1 [6] (125,000,000)  
Option to substitute LC for cash Threshold 2 [6] (550,000,000)  
If credit rating is investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 (125,000,000)  
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 (550,000,000)  
Fair value of fuel derivative level at which cash is received from CP 75,000,000  
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP [5] (150,000,000)  
If credit rating is non-investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 0  
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 $ (550,000,000)  
Fair value of fuel derivative level at which cash is received from CP [4]  
Fair value of fuel derivative levels at which aircraft collateral is pledged to CP $ (150,000,000)  
Minimum | Counterparty F | Fuel derivatives    
If credit rating is investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 (100,000,000)  
Fair value of fuel derivative level at which cash is received from CP $ 0  
If credit rating is non-investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 [4]  
Fair value of fuel derivative level at which cash is received from CP [4]  
Maximum | Counterparty A | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Option to substitute LC for aircraft [2] $ (600,000,000)  
Option to substitute LC for cash Threshold 1  
If credit rating is investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 $ (200,000,000)  
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP [3] (600,000,000)  
If credit rating is non-investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 (200,000,000)  
Fair value of fuel derivative levels at which aircraft collateral is pledged to CP (600,000,000)  
Maximum | Counterparty B | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Option to substitute LC for aircraft [5] (500,000,000)  
If credit rating is investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 (100,000,000)  
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP (500,000,000)  
If credit rating is non-investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 (100,000,000)  
Fair value of fuel derivative levels at which aircraft collateral is pledged to CP (500,000,000)  
Maximum | Counterparty C | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Option to substitute LC for cash Threshold 1 [6] (275,000,000)  
Maximum | Counterparty D | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Option to substitute LC for aircraft [5] (550,000,000)  
Option to substitute LC for cash Threshold 1 [6] (150,000,000)  
If credit rating is investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 (150,000,000)  
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP [5] (550,000,000)  
If credit rating is non-investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 (150,000,000)  
Fair value of fuel derivative levels at which aircraft collateral is pledged to CP (550,000,000)  
Maximum | Counterparty E | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Option to substitute LC for aircraft [5] (550,000,000)  
Option to substitute LC for cash Threshold 1 [6] (150,000,000)  
If credit rating is investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 (150,000,000)  
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP [5] (550,000,000)  
If credit rating is non-investment grade, fair value of fuel derivative level at which:    
Fair value of fuel derivative levels at which aircraft collateral is pledged to CP $ (550,000,000)  
Maximum | Counterparty F | Fuel derivatives    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Option to substitute LC for cash Threshold 1 [8]  
[1] Individual counterparties with fair value of fuel derivatives <$10 million.
[2] The Company has the option of providing letters of credit in addition to aircraft collateral if the appraised value of the aircraft does not meet the collateral requirement.
[3] The Company has the option of providing cash or pledging aircraft as collateral.
[4] Cash collateral is provided at 100 percent of fair value of fuel derivative contracts.
[5] The Company has the option of providing cash, letters of credit, or pledging aircraft as collateral.
[6] The Company has the option of providing cash or letters of credit as collateral.
[7] Thresholds may vary based on changes in credit ratings within investment grade.
[8] The Company has the option to substitute letters of credit for 100 percent of cash collateral requirement.