v3.26.1
COMMITMENTS AND CONTINGENCIES - Narrative (Details)
 1 Months Ended 6 Months Ended
Mar. 31, 2023
defendant
Jul. 31, 2018
defendant
Mar. 31, 2016
mi
May 31, 2007
entity
mi
Jun. 30, 2026
USD ($)
case
facility
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Loss Contingencies [Line Items]                    
Lease liabilities         $ 577,800,000   $ 577,900,000 $ 602,000,000.0    
Reclamation/restoration requirements         464,500,000 $ 460,000,000.0 $ 456,500,000 $ 447,800,000 $ 429,500,000 $ 427,400,000
Contingency loss         0          
Hewitt Landfill Matter | NHW Treatment System                    
Loss Contingencies [Line Items]                    
Estimated capital cost of treatment system         92,000,000          
Hewitt Landfill Matter | NHC Treatment System                    
Loss Contingencies [Line Items]                    
Estimated capital cost of treatment system         245,000,000          
Hewitt Landfill Matter | LADWP                    
Loss Contingencies [Line Items]                    
LADWP Groundwater System Improvement Study, cost         11,500,000          
LADWP Groundwater system additional costs         $ 22,000,000          
Cases Allegedly Involving 1,1,1-Trichloroethane                    
Loss Contingencies [Line Items]                    
Number of cases | case         1          
Cooperating Parties Group                    
Loss Contingencies [Line Items]                    
Number of other companies to perform Remedial Investigation/Feasibility Study | entity       70            
Number of miles of the River used in the Remedial Investigation/Feasibility Study | mi       17            
Number of miles for bank-to-bank dredging remedy | mi     8              
EPA | Maximum                    
Loss Contingencies [Line Items]                    
Estimated implementation costs         $ 1,380,000,000          
Occidental Chemical Co | Lawsuit Filed by Occidental                    
Loss Contingencies [Line Items]                    
Number of defendants | defendant 39 100                
LADWP                    
Loss Contingencies [Line Items]                    
Number of planned new treatment capabilities | facility         2          
Standby Letters of Credit                    
Loss Contingencies [Line Items]                    
Letters of credit outstanding, amount         $ 19,600,000          
Reclamation/restoration requirements         $ 14,400,000