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ENVIRONMENTAL LIABILITIES AND EXPENDITURES (Details)
$ in Millions
 1 Months Ended 9 Months Ended
Jan. 31, 2025
USD ($)
Jun. 30, 2024
USD ($)
Sep. 30, 2021
USD ($)
mi
Mar. 31, 2016
mi
Sep. 30, 2025
USD ($)
party
site
operatingUnit
category
Environmental remediation reserves          
Number of sites | site         155
Current portion of environmental remediation liabilities         $ 150
Environmental remediation reserves, non-current, included in deferred credits and other liabilities - other         1,700
Remediation balance         1,866
Environmental reserves, exceeding $ ten million, threshold value         $ 10
Environmental reserves, exceeding $ ten million, threshold value, number of sites | site         15
Environmental reserves, range between zero to $ one million site category, number of sites | site         90
Percent of reserve to be funded over the next three to four years         30.00%
Minimum period of expending second half of environmental reserves         10 years
Environmental remediation additional loss range         $ 1,900
Potentially responsible parties | party         82
Low end of range          
Environmental remediation reserves          
Period of expending 30 percent of environmental reserves         3 years
High end of range          
Environmental remediation reserves          
Environmental reserves, less than $ one million site category         $ 1
Period of expending 30 percent of environmental reserves         4 years
Non-National Priorities List Sites          
Environmental remediation reserves          
Environmental remediation contingency, number of site categories | category         3
NPL Sites          
Environmental remediation reserves          
Number of sites | site         32
Remediation balance         $ 1,378
Third-Party Sites          
Environmental remediation reserves          
Number of sites | site         61
Remediation balance         $ 177
Currently Operated Sites          
Environmental remediation reserves          
Number of sites | site         11
Remediation balance         $ 83
Closed or Non-Operated Sites          
Environmental remediation reserves          
Number of sites | site         51
Remediation balance         $ 228
Diamond Alkali Superfund Site          
Environmental remediation reserves          
Site contingency, number of operating units | operatingUnit         4
Diamond Alkali Superfund Site - Operable Unit One          
Environmental remediation reserves          
Environmental remediation expense $ 16        
Diamond Alkali Superfund Site - Operable Unit Two          
Environmental remediation reserves          
Environmental remediation expense   $ 1,400      
Stretch of lower passaic river requiring remedial actions | mi       8.3  
Diamond Alkali Superfund Site - Operable Unit Four          
Environmental remediation reserves          
Environmental remediation expense     $ 440    
Stretch of lower passaic river requiring remedial actions | mi     17    
Stretch of lower passaic river not covered by remedial actions | mi     9