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FINANCIAL DERIVATIVE INSTRUMENTS - Fair Values of Fuel Derivatives Amounts Posted as Collateral (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
If credit rating is investment grade, fair value of fuel derivative level at which:    
Letter of credit substitution percentage 100.00%  
Cash collateral provided as a percentage of derivative contract value (in hundredths) 100.00%  
Fuel derivative contracts    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives $ 130  
Cash collateral held from CP 22 $ 50
Fuel derivative contracts | Counterparty A    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives 30  
Cash collateral held from CP 22  
Fuel derivative contracts | Counterparty A | Minimum    
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  
Fuel derivative contracts | Counterparty B    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives 17  
Cash collateral held from CP 0  
Fuel derivative contracts | Counterparty B | Minimum    
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  
Fuel derivative contracts | Counterparty C    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives 18  
Cash collateral held from CP 0  
Fuel derivative contracts | Counterparty C | Minimum    
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)  
Fair value of fuel derivative level at which cash is received from CP 250  
Fuel derivative contracts | Counterparty D    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives 10  
Cash collateral held from CP 0  
Fuel derivative contracts | Counterparty D | Minimum    
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)  
Fair value of fuel derivative level at which cash is received from CP 125  
Fuel derivative contracts | Counterparty E    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives 14  
Cash collateral held from CP 0  
Fuel derivative contracts | Counterparty E | Minimum    
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  
Fuel derivative contracts | Counterparty F    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives 11  
Cash collateral held from CP 0  
Fuel derivative contracts | Counterparty F | Minimum    
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 (65)  
Fair value of fuel derivative level at which cash is received from CP 70  
Fuel derivative contracts | Counterparty G    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives 13  
Cash collateral held from CP 0  
Fuel derivative contracts | Counterparty G | Minimum    
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 100  
Fuel derivative contracts | Counterparty H    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives 13  
Cash collateral held from CP 0  
Fuel derivative contracts | Counterparty H | Minimum    
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 100  
Fuel derivative contracts | Counterparty I    
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]    
Fair value of fuel derivatives 4  
Cash collateral held from CP $ 0