v3.26.1
Commitments and Contingencies - Additional Information (Detail)
$ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
Apr. 01, 2026
USD ($)
Sep. 28, 2021
USD ($)
Dec. 31, 2020
Party
Jun. 30, 2018
Defendant
Dec. 17, 2017
Defendant
Mar. 04, 2016
USD ($)
Jul. 07, 2014
Defendant
May 31, 2017
Defendant
Jun. 30, 2026
USD ($)
Party
Dec. 31, 2022
USD ($)
Dec. 31, 2004
Entity
Dec. 31, 2025
USD ($)
Dec. 31, 2021
Party
Dec. 31, 2018
Party
Mar. 31, 2016
Party
Loss Contingencies [Line Items]                              
Accrued legal matters                 $ 5.0     $ 5.6      
Description of allocation methodology approved by EPA                 allocation methodology approved by the EPA that contains associated allocation shares for each of the parties invited to participate in the allocation, including Occidental - who the allocator concluded was responsible for more than 99% of the costs to implement the OU2 remedy.            
Number of settling parties | Party     85           85            
Number of remaining settling parties | Party                 82            
Settlement amount $ 0.5                            
Occidental Chemical Corporation [Member]                              
Loss Contingencies [Line Items]                              
Number of defendants under complaint | Defendant       120                      
EPA [Member]                              
Loss Contingencies [Line Items]                              
Number of potentially responsible parties | Party                         21 21 100
Amount agreed by settling parties to EPA                   $ 150.0          
8 Mile Stretch of Lower Passaic River [Member]                              
Loss Contingencies [Line Items]                              
Cost estimate for remediating Lower Passaic River           $ 1,380.0                  
Upper 9-mile IR ROD [Member]                              
Loss Contingencies [Line Items]                              
Estimated cost of dredging and capping to control sediment sources of dioxin and PCBs   $ 441.0                          
Minimum [Member] | 17 Mile Stretch of Lower Passaic River [Member] | EPA [Member]                              
Loss Contingencies [Line Items]                              
Number of entities to which general notice letters issued | Entity                     100        
Lower Passaic River [Member] | Minimum [Member] | 17 Mile Stretch of Lower Passaic River [Member]                              
Loss Contingencies [Line Items]                              
Parties to perform a remedial investigation and feasibility study | Defendant               70              
MTBE [Member] | Minimum [Member] | PA [Member]                              
Loss Contingencies [Line Items]                              
Number of defendants in the MTBE complaint | Defendant             50                
MTBE [Member] | Minimum [Member] | MARYLAND [Member]                              
Loss Contingencies [Line Items]                              
Number of defendants in the MTBE complaint | Defendant         60