STOCK-BASED COMPENSATION (Weighted Average Assumptions) (Details) - PBF Energy [Member] - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	6 years 29 days	6 years 3 months	6 years 3 months
Expected volatility	69.10%	38.60%	35.80%
Dividend yield	1.41%	3.54%	3.49%
Risk-free rate of return	0.81%	2.16%	2.82%
Exercise price (in dollars per share)	$ 13.58	$ 34.11	$ 35.25
Weighted average fair value per unit (in dollars per share)	5.49	9.43	$ 9.55
Granted (in dollars per share)	13.58
Performance Share Units
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%
Granted (in dollars per share)	$ 10.77	$ 27.99	$ 50.23
Performance Share Units | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	2 years 10 months 20 days	2 years 2 months 1 day
Expected volatility	39.88%	37.19%
Dividend yield	0.00%	3.40%
Risk-free rate of return	0.26%	1.66%
Performance Share Units | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	3 years 1 month 20 days	2 years 10 months 17 days
Expected volatility	82.63%	41.70%
Dividend yield	4.28%	3.67%
Risk-free rate of return	1.34%	2.51%