PREFERRED STOCK (Details) $ / shares in Units, $ in Millions			12 Months Ended
	Jul. 13, 2018 USD ($) shares $ / shares Rate	Jan. 09, 2018 USD ($) shares $ / shares Rate	Dec. 31, 2019 USD ($) $ / shares Rate shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($)
Preferred Stock [Line Items]
Preferred stock shares authorized (in shares)			50,000,000	50,000,000
Value of shares issued | $			$ 0	$ 2,258	$ 0
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
Sempra Energy [Member]
Preferred Stock [Line Items]
Preferred stock shares authorized (in shares)			50,000,000
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]
Number of preferred stock shares outstanding (in shares)			17,250,000
Series A Preferred Stock [Member] | Sempra Energy [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	$ 100.00
Conversion price per share net of underwriting discount (in dollars per share) | $ / shares		98.20
Liquidation preference (in dollars per share) | $ / shares		$ 100.00
Value of shares issued | $	$ 565	$ 1,690
Underwriting discount | $	$ 10	$ 32
Threshold appreciation price (in dollars per share) | $ / shares		$ 131.075	$ 131.075
Number of shares issuable		13,200,000
Share dividends issued, percentage of weighted average share price		97.00%
Series B Preferred Stock [Member]
Preferred Stock [Line Items]
Number of preferred stock shares outstanding (in shares)			5,750,000
Series B Preferred Stock [Member] | Sempra Energy [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		$ 100.00
Conversion price per share net of underwriting discount (in dollars per share) | $ / shares	98.35
Liquidation preference (in dollars per share) | $ / shares	100.00
Threshold appreciation price (in dollars per share) | $ / shares	$ 136.500		$ 136.50
Number of shares issuable	4,200,000
Share dividends issued, percentage of weighted average share price	97.00%
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	$ 22
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	3
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
Par value (in dollars per share) | $ / shares			$ 25
Preferred stock outstanding | $			$ 19	19
So Cal Gas Preferred Stock Owned By Pacific Enterprises [Member]
Preferred Stock [Line Items]
Preferred stock outstanding held by parent | $			$ (2)	(2)
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	$ 20
Minimum [Member] | Series A Preferred Stock [Member] | Sempra Energy [Member]
Preferred Stock [Line Items]
Threshold appreciation price (in dollars per share) | $ / shares		$ 107.000	$ 107.00
Shares issuable for each instrument | Rate		76.29%	76.29%
Minimum [Member] | Series B Preferred Stock [Member] | Sempra Energy [Member]
Preferred Stock [Line Items]
Threshold appreciation price (in dollars per share) | $ / shares	$ 113.750		$ 113.75
Shares issuable for each instrument | Rate	73.26%		73.26%
Maximum [Member] | Series A Preferred Stock [Member] | Sempra Energy [Member]
Preferred Stock [Line Items]
Threshold appreciation price (in dollars per share) | $ / shares		$ 131.075	$ 131.075
Shares issuable for each instrument | Rate		93.45%	93.45%
Maximum [Member] | Series B Preferred Stock [Member] | Sempra Energy [Member]
Preferred Stock [Line Items]
Threshold appreciation price (in dollars per share) | $ / shares	$ 136.500		$ 136.50
Shares issuable for each instrument | Rate	87.91%		87.91%
Over-Allotment Option [Member] | Series A Preferred Stock [Member] | Sempra Energy [Member]
Preferred Stock [Line Items]
Shares issued (in shares)		2,250,000
Over-Allotment Option [Member] | Series B Preferred Stock [Member] | Sempra Energy [Member]
Preferred Stock [Line Items]
Shares issued (in shares)	750,000