REGULATORY MATTERS - GAS Schedule of Utility Regulation and Rate Design (Details)			1 Months Ended	12 Months Ended
	Nov. 18, 2021	Sep. 14, 2021	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2019
Nicor Gas
Public Utilities, General Disclosures [Line Items]
Authorized ROE	9.75%			9.75%	9.73%
Atlanta Gas Light
Public Utilities, General Disclosures [Line Items]
Authorized ROE			10.25%	10.25%
Virginia Natural Gas
Public Utilities, General Disclosures [Line Items]
Authorized ROE		9.50%		9.50%
Chattanooga Gas
Public Utilities, General Disclosures [Line Items]
Authorized ROE				9.80%