COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES (Environmental Remediation Obligations) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Jun. 30, 2011
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 97
Environmental exit costs, assets previously disposed, liability for remediation	40
Cass Lake, Minnesota [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 47	$ 46