v3.25.1
COMMITMENTS AND CONTINGENCIES (Mine Reclamation) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Four Corners    
Jointly Owned Utility Plant Interests [Line Items]    
final mine reclamation liability $ 3 $ 3
San Juan    
Jointly Owned Utility Plant Interests [Line Items]    
final mine reclamation liability $ 29 $ 31