LINES OF CREDIT AND SHORT-TERM BORROWINGS - SCHEDULE OF CREDIT FACILITIES AND AVAILABLE LIQUIDITY (Details) - USD ($)	Dec. 31, 2021	Sep. 01, 2021
Line of Credit
Line of Credit Facility [Line Items]
Total Facility	$ 1,000,000,000
Usage	346,700,000
Available Liquidity	653,300,000
South Jersey Industries Inc. | Line of Credit | Line of Credit
Line of Credit Facility [Line Items]
Total Facility	500,000,000
Usage	152,800,000
Available Liquidity	347,200,000
Letters of credit outstanding	9,800,000
South Jersey Industries Inc. | Line of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Total Facility		$ 500,000,000
South Jersey Gas Company | Line of Credit | Line of Credit
Line of Credit Facility [Line Items]
Letters of credit outstanding	1,900,000
South Jersey Gas Company | Line of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Total Facility		$ 200,000,000
South Jersey Gas Company | Commercial Paper and Letters of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Total Facility	250,000,000
Usage	109,900,000
Available Liquidity	140,100,000
ETG/SJIU | Line of Credit | Line of Credit
Line of Credit Facility [Line Items]
Letters of credit outstanding	1,000,000
ETG/SJIU | Line of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Total Facility	250,000,000
Usage	84,000,000
Available Liquidity	$ 166,000,000