LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES - Changes in the Reserve for Environmental Remediation (Details) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($)
Environmental Exit Cost [Line Items]
Reserve balance as of December 31, 2017	$ 48
Reserve charges and adjustments, net	27
Payments	(13)
Reserve balance as of December 31, 2018	$ 62

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Amount of expense for newly incurred environmental loss contingencies. Includes, but is not limited to, remediation expense and interest accretion.

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Amount of cash outflow to settle environmental loss contingencies.

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