SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset	$ 263	$ 302
Lease liability	284	302
Other non-current liabilities adjustment, upon adoption of ASU	(760)		$ (581)
Reduction, right-of-use asset, upon adoption of ASU	$ (263)	(302)
Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset		(20)
Other non-current liabilities adjustment, upon adoption of ASU		20
Reduction, right-of-use asset, upon adoption of ASU		$ 20