SIGNIFICANT ACCOUNTING POLICIES - Adoption of New Accounting Standards (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset	$ 271	$ 302
Lease liability	293	302
Other non-current liabilities adjustment, upon adoption of ASU	$ (851)		$ (581)
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