PREFERRED STOCK (Details)			1 Months Ended		12 Months Ended
	Jun. 19, 2020 USD ($) $ / shares shares	Jul. 13, 2018 shares	Jul. 31, 2018 USD ($) $ / shares shares	Jan. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) director day $ / shares shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 shares	Jan. 15, 2021 shares
Preferred Stock [Line Items]
Preferred stock shares authorized (in shares)					50,000,000	50,000,000
Shares issued (in shares)					0	16,906,185	21,175,473
Increase (decrease) in number of directors | director					2
Sempra Energy [Member]
Preferred Stock [Line Items]
Preferred stock shares authorized (in shares)					50,000,000
San Diego Gas and Electric Company [Member]
Preferred Stock [Line Items]
Preferred stock shares authorized (in shares)					45,000,000	45,000,000
Number of preferred stock shares outstanding (in shares)					0	0
Preferred stock, shares issued (in shares)					0	0
Southern California Gas Company [Member]
Preferred Stock [Line Items]
Preferred stock shares authorized (in shares)					11,000,000	11,000,000
Number of preferred stock shares outstanding (in shares)					1,000,000	1,000,000
Series A Preferred Stock [Member]
Preferred Stock [Line Items]
Shares issued (in shares)				17,250,000
Stated percentage rate				6.00%
Conversion price per share (in dollars per share) | $ / shares				$ 100.00
Conversion price per share net of underwriting discount (in dollars per share) | $ / shares				$ 98.20
Value of shares issued | $				$ 1,690,000,000
Underwriting discount | $				$ 32,000,000
Liquidation preference (in dollars per share) | $ / shares				$ 100.00
Series A Preferred Stock [Member] | Subsequent Event [Member]
Preferred Stock [Line Items]
Shares converted								17,250,000
Series B Preferred Stock [Member]
Preferred Stock [Line Items]
Shares issued (in shares)			5,750,000
Stated percentage rate			6.75%
Conversion price per share (in dollars per share) | $ / shares			$ 100.00
Conversion price per share net of underwriting discount (in dollars per share) | $ / shares			$ 98.35
Value of shares issued | $			$ 565,000,000
Underwriting discount | $			$ 10,000,000
Liquidation preference (in dollars per share) | $ / shares			$ 100.00
Series B Preferred Stock [Member] | Sempra Energy [Member]
Preferred Stock [Line Items]
Conversion price per share (in dollars per share) | $ / shares					$ 100.00
Threshold appreciation price (in dollars per share) | $ / shares					$ 136.50
Number of shares issuable		4,200,000
Share dividends issued, percentage of weighted average share price		97.00%
Consecutive trading days | day					5
Convertible Preferred Stock Series A [Member]
Preferred Stock [Line Items]
Number of preferred stock shares outstanding (in shares)					17,250,000	17,250,000
Convertible Preferred Stock Series A [Member] | Subsequent Event [Member]
Preferred Stock [Line Items]
Shares converted								13,781,025
Preferred stock conversion ratio								0.7989
Series C Preferred Stock [Member]
Preferred Stock [Line Items]
Number of preferred stock shares outstanding (in shares)					900,000
Stated percentage rate	4.875%
Preferred stock, shares issued (in shares)	900,000
Preferred stock redemption price (in dollars per share) | $ / shares	$ 1,000
Preferred stock, discount on shares | $	$ 11,000,000
Proceeds from issuance of preferred stock | $	889,000,000
Preferred stock, liquidation preference | $	$ 1,000
Series C Preferred Stock [Member] | Debt Instrument, Redemption, Period Three [Member]
Preferred Stock [Line Items]
Preferred stock redemption price (in dollars per share) | $ / shares	$ 1,020
Liquidation preference per share (as a percent)	102.00%
Series C Preferred Stock [Member] | Debt Instrument, Redemption, Period One [Member]
Preferred Stock [Line Items]
Liquidation preference (in dollars per share) | $ / shares	$ 1,000
Preferred stock, percent	4.875%
Series C Preferred Stock [Member] | Debt Instrument, Redemption, Period Two [Member]
Preferred Stock [Line Items]
Liquidation preference (in dollars per share) | $ / shares	$ 1,000
Preferred stock, percent	4.55%
So Cal Gas Series Preferred Stock [Member]
Preferred Stock [Line Items]
Preferred stock shares authorized (in shares)					5,000,000
So Cal Gas Series Preferred Stock [Member] | Southern California Gas Company [Member]
Preferred Stock [Line Items]
Preferred stock shares authorized (in shares)					5,000,000
Preferred stock outstanding | $					$ 22,000,000	$ 22,000,000
Twenty Five Dollar Par, Six Percent Series [Member] | Southern California Gas Company [Member]
Preferred Stock [Line Items]
Preferred stock shares authorized (in shares)					1,000,000
Number of preferred stock shares outstanding (in shares)					79,011
Par value (in dollars per share) | $ / shares					$ 25
Preferred stock outstanding | $					$ 3,000,000	3,000,000
Twenty Five Dollar Par, Six Percent Series A [Member] | Southern California Gas Company [Member]
Preferred Stock [Line Items]
Number of preferred stock shares outstanding (in shares)					783,032
Liquidation preference (in dollars per share) | $ / shares					$ 25
Preferred stock outstanding | $					$ 19,000,000	19,000,000
So Cal Gas Preferred Stock Owned By Pacific Enterprises [Member]
Preferred Stock [Line Items]
Preferred stock outstanding held by parent | $					$ (2,000,000)	(2,000,000)
So Cal Gas Preferred Stock Owned By Pacific Enterprises [Member] | Southern California Gas Company [Member]
Preferred Stock [Line Items]
Number of preferred stock shares outstanding (in shares)					50,970
Preferred Stock Of Subsidiaries [Member]
Preferred Stock [Line Items]
Preferred stock outstanding | $					$ 20,000,000	$ 20,000,000
Minimum [Member] | Series B Preferred Stock [Member] | Sempra Energy [Member]
Preferred Stock [Line Items]
Threshold appreciation price (in dollars per share) | $ / shares					$ 113.75
Shares issuable for each instrument					0.7326
Maximum [Member] | Series B Preferred Stock [Member] | Sempra Energy [Member]
Preferred Stock [Line Items]
Threshold appreciation price (in dollars per share) | $ / shares					$ 136.50
Shares issuable for each instrument					0.8791