v3.26.1
ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Accrual for Environmental Loss Contingencies [Roll Forward]    
Beginning of period $ 318  
End of period 315 $ 318
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract]    
Accrued Environmental Loss Contingencies, Current 25 20
Accrued Environmental Loss Contingencies, Noncurrent 290 298
Environmental Remediation [Member]    
Accrual for Environmental Loss Contingencies [Roll Forward]    
Beginning of period 285 252
Changes in estimates recognized in earnings and other 1 48
Cash reductions (4) (15)
End of period $ 282 285
Expected Payment Period of Environmental Contingencies approximately 30 years  
Environmental Remediation [Member] | Minimum [Member]    
Site Contingency [Line Items]    
Loss Contingency, Estimate of Possible Loss $ 282 285
Environmental Remediation [Member] | Maximum [Member]    
Site Contingency [Line Items]    
Loss Contingency, Estimate of Possible Loss 508 509
Environmental ARO [Member]    
Site Contingency [Line Items]    
Best Estimate Accrued to-date For Asset Retirement Obligation 33 33
Non Environmental ARO [Member]    
Site Contingency [Line Items]    
Best Estimate Accrued to-date For Asset Retirement Obligation $ 57 $ 56