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Financial Derivative Instruments - Fair Values of Fuel Derivatives Amounts Posted as Collateral (Details)
$ in Millions
Dec. 31, 2019
USD ($)
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 $ 7
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 - asset $ 110
Collateral Already Posted, Aggregate Fair Value 25
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 - asset 22
Collateral Already Posted, Aggregate Fair Value 25
Aircraft collateral pledged to CP 0
Letters of credit (LC) 0
Counterparty A | Minimum | 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 (200) [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 (100)
Fair value of fuel derivative level at which cash is received from CP 0 [2]
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP (200) [3]
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)
Fair value of fuel derivative level at which cash is received from CP [4]
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP (200)
Counterparty A | Maximum | 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 (600) [1]
If credit rating is investment grade, fair value of fuel derivative level at which:  
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP (600) [3]
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)
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP (600)
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 - asset 16
Collateral Already Posted, Aggregate Fair Value 0
Aircraft collateral pledged to CP 0
Letters of credit (LC) 0
Counterparty B | Minimum | 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 (50)
Fair value of fuel derivative level at which cash is received from CP 150 [2]
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]
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
Collateral Already Posted, Aggregate Fair Value 0
Aircraft collateral pledged to CP 0
Letters of credit (LC) 0
Counterparty C | Minimum | 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 (150) [5]
Option to substitute LC for cash Threshold 1 (75) [5]
Option to substitute LC for cash Threshold 2 (550) [5]
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) [2]
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 (550) [2]
Fair value of fuel derivative level at which cash is received from CP 250 [2]
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP (150) [5]
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)
Fair value of fuel derivative level at which cash is received from CP [4]
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP (150)
Counterparty C | Maximum | 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 (550) [5]
Option to substitute LC for cash Threshold 1 (150) [5]
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) [2]
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP (550) [5]
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)
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP (550)
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 - asset 12
Collateral Already Posted, Aggregate Fair Value 0
Aircraft collateral pledged to CP 0
Letters of credit (LC) 0
Counterparty D | Minimum | 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 (150) [5]
Option to substitute LC for cash Threshold 1 (125) [6]
Option to substitute LC for cash Threshold 2 (550) [6]
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) [2]
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 (550) [2]
Fair value of fuel derivative level at which cash is received from CP 125 [2]
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP (150) [5]
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)
Fair value of fuel derivative level at which cash is received from CP [4]
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP (150)
Counterparty D | Maximum | 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 (550) [5]
Option to substitute LC for cash Threshold 1 (150) [6]
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) [2]
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP (550) [5]
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)
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP (550)
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 8
Collateral Already Posted, Aggregate Fair Value 0
Aircraft collateral pledged to CP 0
Letters of credit (LC) 0
Counterparty E | Minimum | 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]
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 (40)
Fair value of fuel derivative level at which cash is received from CP 100 [2]
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]
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 16 [7]
Collateral Already Posted, Aggregate Fair Value 0 [7]
Aircraft collateral pledged to CP 0 [7]
Letters of credit (LC) $ 0 [7]
[1] 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 requirements.
[2] Thresholds may vary based on changes in credit ratings within investment grade.
[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 to substitute letters of credit for 100 percent of cash collateral requirement.
[7] Individual counterparties with fair value of fuel derivatives <$7 million.