COMMITMENTS AND CONTINGENCIES Environmental Remediation Obligations (Details) - USD ($) $ in Millions	Sep. 30, 2016	Jun. 30, 2011
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 95
Environmental exit costs, assets previously disposed, liability for remediation	40
Cass Lake, Minnesota [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 50	$ 46