STOCK-BASED COMPENSATION (Weighted Average Assumptions) (Details) - PBF Energy [Member] - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	6 years 3 months	6 years 3 months	6 years 3 months
Expected volatility	38.60%	35.80%	39.50%
Dividend yield	3.54%	3.49%	4.58%
Risk-free rate of return	2.16%	2.82%	2.09%
Exercise price (in dollars per share)	$ 34.11	$ 35.25	$ 26.52
Performance share units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)		2 years 2 months 1 day
Expected volatility		39.04%
Dividend yield		2.95%
Risk-free rate of return		2.89%
Exercise price (in dollars per share)	$ 27.99	$ 50.23
Performance share units [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	2 years 2 months 1 day
Expected volatility	37.19%
Dividend yield	3.40%
Risk-free rate of return	1.66%
Performance share units [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	2 years 10 months 18 days
Expected volatility	41.70%
Dividend yield	3.67%
Risk-free rate of return	2.51%

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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