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Financial Derivative Instruments - Fair Values of Fuel Derivatives Amounts Posted as Collateral (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
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 $ 3,000,000  
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 - liability $ (326,000,000)  
Total collateral already posted aggregate fair value 301,000,000 $ 835,000,000
Aircraft collateral pledged to CP 0  
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 - liability (298,000,000)  
Cash collateral held by CP (279,000,000)  
Aircraft collateral pledged to CP 0  
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 - liability (78,000,000)  
Cash collateral held by CP (33,000,000)  
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 - asset 36,000,000  
Cash collateral held by CP 0  
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 - liability (5,000,000)  
Cash collateral held by CP 0  
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 - asset 3,000,000  
Cash collateral held by CP 0  
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 - asset 12,000,000  
Cash collateral held by CP 11,000,000  
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 - asset [1] 4,000,000  
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)  
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 [3] 50,000,000  
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP [4] (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 [5]  
Fair value of fuel derivative levels at which aircraft or cash 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 [6] (100,000,000)  
Option to substitute LC for cash Threshold 1 [7] (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 [3] 150,000,000  
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP [6] (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 [5]  
Fair value of fuel derivative levels at which aircraft or cash 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 [7] (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 [3] 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 [5]  
Fair value of fuel derivative level at which cash is received from CP [5]  
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 [6] (150,000,000)  
Option to substitute LC for cash Threshold 1 [7] (75,000,000)  
Option to substitute LC for cash Threshold 2 [7] (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 [3] 250,000,000  
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP [6] (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 [5]  
Fair value of fuel derivative levels at which aircraft or cash 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 [6] (150,000,000)  
Option to substitute LC for cash Threshold 1 [7] (125,000,000)  
Option to substitute LC for cash Threshold 2 [7] (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 [3] 75,000,000  
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP [6] (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 [5]  
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP (150,000,000)  
Minimum | 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]  
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 [3] 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 [5]  
Fair value of fuel derivative level at which cash is received from CP [5]  
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 [4] (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 or cash 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 [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 (100,000,000)  
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP [6] (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 or cash 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 [7] (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 [6] (550,000,000)  
Option to substitute LC for cash Threshold 1 [7] (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 [6] (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 or cash 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 [6] (550,000,000)  
Option to substitute LC for cash Threshold 1 [7] (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 [6] (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 or cash collateral is pledged to CP $ (550,000,000)  
[1] Individual counterparties with fair value of fuel derivatives <$3 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] Thresholds may vary based on changes in credit ratings within investment grade.
[4] The Company has the option of providing cash or pledging aircraft as collateral.
[5] Cash collateral is provided at 100 percent of fair value of fuel derivative contracts.
[6] The Company has the option of providing cash, letters of credit, or pledging aircraft as collateral.
[7] The Company has the option of providing cash or letters of credit as collateral.
[8] The Company has the option to substitute letters of credit for 100 percent of cash collateral requirement.