SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - PRINCIPLES OF CONSOLIDATION (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)		Dec. 31, 2016 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Equity earnings, before income tax	$ (236)	$ 34		$ 6
Income before income taxes and equity earnings of unconsolidated entities	1,046	1,551	[1]	1,824	[1]
Equity earnings	$ 176	76	[1]	84	[1]
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments [Abstract]
Number of reportable segments | segment	7
As previously reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Equity earnings, before income tax		34		6
Income before income taxes and equity earnings of unconsolidated entities		1,585		1,830
Equity earnings, net of income tax		$ 42		$ 78

[1] As adjusted for the retrospective adoption of ASU 2017-07, which we discuss in Note 2, and a reclassification to conform to current year presentation, which we discuss in Note 1.