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COMMITMENTS AND CONTINGENCIES Environmental Remediation Obligations (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 30, 2011
Loss Contingencies [Line Items]    
Accrual for environmental loss contingencies $ 145  
Accrual for environmental loss contingencies, gross 155  
Cass Lake, Minnesota    
Loss Contingencies [Line Items]    
Accrual for environmental loss contingencies $ 47 $ 46