CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2018
Dividends declared per share of common stock (in dollars per share)	$ 1.05	$ 0.96	$ 3.14	$ 2.90
Accounting Standards Update [Extensible List]			us-gaap:AccountingStandardsUpdate201613Member
San Diego Gas and Electric Company [Member]
Dividends declared per share of common stock (in dollars per share)			$ 1.72
Accounting Standards Update [Extensible List]					us-gaap:AccountingStandardsUpdate201802Member
Southern California Gas Company [Member]
Dividends declared per share of preferred stock (in dollars per share)	0.38	0.38	1.13	1.13
Dividends declared per share of common stock (in dollars per share)	0.55	1.64	1.10	1.64
Accounting Standards Update [Extensible List]					us-gaap:AccountingStandardsUpdate201802Member
Series A Preferred Stock [Member]
Dividends declared per share of preferred stock (in dollars per share)	1.50	1.50	4.50	4.50
Series B Preferred Stock [Member]
Dividends declared per share of preferred stock (in dollars per share)	1.68	$ 1.68	5.06	$ 5.06
Series C Preferred Stock [Member]
Dividends declared per share of preferred stock (in dollars per share)	$ 14.08		$ 15.71