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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - PRINCIPLES OF CONSOLIDATION (Details) $ in Millions | 12 Months Ended
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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.

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