REGULATORY MATTERS - COST OF CAPITAL & FERC RATES (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended				36 Months Ended
	Oct. 31, 2019	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2022	Jan. 01, 2022	Aug. 31, 2021
California Public Utilities Commission
Public Utilities, General Disclosures [Line Items]
CCM benchmark rate, variable rate (as a percent)					1.00%
San Diego Gas and Electric Company [Member]
Public Utilities, General Disclosures [Line Items]
Minimum common equity ratio (as a percent)	10.60%
FERC requirement to maintain common equity ratio at or above, base (as a percent)	10.10%
FERC requirement, additional basis spread	0.50%
FERC, revenue requirement				$ 12
San Diego Gas and Electric Company [Member] | California Public Utilities Commission
Public Utilities, General Disclosures [Line Items]
CCM benchmark rate (as a percent)		4.498%
Common equity ratio (as a percent)					52.00%			54.00%
Authorized ROE (as a percent)					10.20%			10.55%
Cost of debt (as a percent)					4.59%			3.84%
Proposed return on base rate (as a percent)					7.55%			7.46%
CCM benchmark rate, percentage below (as a percent)			1.17%
San Diego Gas and Electric Company [Member] | Federal Energy Regulatory Commission
Public Utilities, General Disclosures [Line Items]
FERC, revenue requirement				$ 17
San Diego Gas and Electric Company [Member] | Common Equity | Federal Energy Regulatory Commission
Public Utilities, General Disclosures [Line Items]
Return on rate base (as a percent)				10.05%
SoCalGas | California Public Utilities Commission
Public Utilities, General Disclosures [Line Items]
CCM benchmark rate (as a percent)		4.029%
Forecast | San Diego Gas and Electric Company [Member] | California Public Utilities Commission
Public Utilities, General Disclosures [Line Items]
Authorized weighting, total (as a percent)						100.00%
Weighted return on rate base, total (as a percent)						7.55%
Authorized ROE (as a percent)							9.62%
Forecast | San Diego Gas and Electric Company [Member] | Authorized weighting | California Public Utilities Commission
Public Utilities, General Disclosures [Line Items]
Plan percentage of capital structure allocated to debt						45.25%
Forecast | San Diego Gas and Electric Company [Member] | Authorized weighting | California Public Utilities Commission | Preferred Equity
Public Utilities, General Disclosures [Line Items]
Return on rate base (as a percent)						2.75%
Forecast | San Diego Gas and Electric Company [Member] | Authorized weighting | California Public Utilities Commission | Common Equity
Public Utilities, General Disclosures [Line Items]
Return on rate base (as a percent)						52.00%
Forecast | San Diego Gas and Electric Company [Member] | Return on Rate Base | California Public Utilities Commission
Public Utilities, General Disclosures [Line Items]
Plan percentage of capital structure allocated to debt						4.59%
Forecast | San Diego Gas and Electric Company [Member] | Return on Rate Base | California Public Utilities Commission | Preferred Equity
Public Utilities, General Disclosures [Line Items]
Return on rate base (as a percent)						6.22%
Forecast | San Diego Gas and Electric Company [Member] | Return on Rate Base | California Public Utilities Commission | Common Equity
Public Utilities, General Disclosures [Line Items]
Return on rate base (as a percent)						10.20%
Forecast | San Diego Gas and Electric Company [Member] | Weighted Return on Rate Base | California Public Utilities Commission
Public Utilities, General Disclosures [Line Items]
Plan percentage of capital structure allocated to debt						2.08%
Forecast | San Diego Gas and Electric Company [Member] | Weighted Return on Rate Base | California Public Utilities Commission | Preferred Equity
Public Utilities, General Disclosures [Line Items]
Return on rate base (as a percent)						0.17%
Forecast | San Diego Gas and Electric Company [Member] | Weighted Return on Rate Base | California Public Utilities Commission | Common Equity
Public Utilities, General Disclosures [Line Items]
Return on rate base (as a percent)						5.30%
Forecast | SoCalGas | California Public Utilities Commission
Public Utilities, General Disclosures [Line Items]
Authorized weighting, total (as a percent)						100.00%
Weighted return on rate base, total (as a percent)						7.30%
Forecast | SoCalGas | Authorized weighting | California Public Utilities Commission
Public Utilities, General Disclosures [Line Items]
Plan percentage of capital structure allocated to debt						45.60%
Forecast | SoCalGas | Authorized weighting | California Public Utilities Commission | Preferred Equity
Public Utilities, General Disclosures [Line Items]
Return on rate base (as a percent)						2.40%
Forecast | SoCalGas | Authorized weighting | California Public Utilities Commission | Common Equity
Public Utilities, General Disclosures [Line Items]
Return on rate base (as a percent)						52.00%
Forecast | SoCalGas | Return on Rate Base | California Public Utilities Commission
Public Utilities, General Disclosures [Line Items]
Plan percentage of capital structure allocated to debt						4.23%
Forecast | SoCalGas | Return on Rate Base | California Public Utilities Commission | Preferred Equity
Public Utilities, General Disclosures [Line Items]
Return on rate base (as a percent)						6.00%
Forecast | SoCalGas | Return on Rate Base | California Public Utilities Commission | Common Equity
Public Utilities, General Disclosures [Line Items]
Return on rate base (as a percent)						10.05%
Forecast | SoCalGas | Weighted Return on Rate Base | California Public Utilities Commission
Public Utilities, General Disclosures [Line Items]
Plan percentage of capital structure allocated to debt						1.93%
Forecast | SoCalGas | Weighted Return on Rate Base | California Public Utilities Commission | Preferred Equity
Public Utilities, General Disclosures [Line Items]
Return on rate base (as a percent)						0.14%
Forecast | SoCalGas | Weighted Return on Rate Base | California Public Utilities Commission | Common Equity
Public Utilities, General Disclosures [Line Items]
Return on rate base (as a percent)						5.23%