v3.24.0.1
EMPLOYEE BENEFITS PLANS (Additional Information) (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
defined_benefit_plan
plan
Dec. 31, 2022
USD ($)
defined_benefit_plan
Dec. 31, 2021
USD ($)
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Number of defined benefit pension plans | plan 3    
Number of qualified defined benefit pension plans | plan 2    
Number of pension plans | defined_benefit_plan 3 1  
Projected benefit obligation $ 461,000,000 $ 21,000,000  
Plan assets $ 432,000,000 $ 0  
Percentage of service cost that was capitalized (in percentage) 21.00% 21.00% 22.00%
Investment return model best-estimate range (in years) 20 years    
Matching 401(k) contributions made $ 8,000,000 $ 7,000,000 $ 7,000,000
Regulatory Asset      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Effect of Settlement   3,000,000  
Level 3      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value measurements of plan assets 29,000,000 33,000,000 30,000,000
Other Postretirement Benefits      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Employer contribution to VEBA trust 2,000,000 2,000,000 3,000,000
Effect of Settlement 0 0 0
Fair value measurements of plan assets 27,000,000 23,000,000 28,000,000
Other Postretirement Benefits | Level 1 and Level 2      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value measurements of plan assets 27,000,000 23,000,000  
Other Postretirement Benefits | Level 3      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value measurements of plan assets 0    
Pension Benefits      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Accumulated benefit obligation 409,000,000 373,000,000  
Effect of Settlement 0 (3,000,000) 0
Fair value measurements of plan assets 432,000,000 398,000,000 $ 538,000,000
Pension Benefits | Level 3      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value measurements of plan assets 29,000,000 33,000,000  
Transfers $ 0    
Minimum      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Percentile of investment return model range used (in percentage) 25.00%    
Maximum      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Percentile of investment return model range used (in percentage) 75.00%    
Fixed Income Securities | Other Postretirement Benefits | Level 1 and Level 2      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value measurements of plan assets $ 10,000,000 9,000,000  
Equities | Other Postretirement Benefits | Level 1 and Level 2      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value measurements of plan assets $ 17,000,000 $ 14,000,000