CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total		Series A Preferred Stock [Member]	Series B Preferred Stock [Member]	Series C Preferred Stock [Member]	Preferred stock [Member]	Common Stock [Member]	Retained earnings [Member]	Retained earnings [Member] Series A Preferred Stock [Member]	Retained earnings [Member] Series B Preferred Stock [Member]	Retained earnings [Member] Series C Preferred Stock [Member]	Accumulated other comprehensive income (loss) [Member]	Shareholders' equity [Member]	Shareholders' equity [Member] Series A Preferred Stock [Member]	Shareholders' equity [Member] Series B Preferred Stock [Member]	Shareholders' equity [Member] Series C Preferred Stock [Member]	Noncontrolling Interest [Member]	San Diego Gas and Electric Company [Member]	San Diego Gas and Electric Company [Member] Common Stock [Member]	San Diego Gas and Electric Company [Member] Retained earnings [Member]	San Diego Gas and Electric Company [Member] Accumulated other comprehensive income (loss) [Member]	San Diego Gas and Electric Company [Member] Shareholders' equity [Member]	Southern California Gas Company [Member]	Southern California Gas Company [Member] Preferred stock [Member]	Southern California Gas Company [Member] Common Stock [Member]	Southern California Gas Company [Member] Retained earnings [Member]	Southern California Gas Company [Member] Accumulated other comprehensive income (loss) [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Shareholders' equity [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Noncontrolling Interest [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Preferred stock [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Retained earnings [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Accumulated other comprehensive income (loss) [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Shareholders' equity [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2019	$ 21,805					$ 2,258	$ 7,480	$ 11,130				$ (939)	$ 19,929				$ 1,876		$ 1,660	$ 5,456	$ (16)	$ 7,100	$ 4,748	$ 22	$ 866	$ 3,883	$ (23)	$ (9)	$ (7)	$ (7)	$ (2)	$ 21,796	$ 2,258	$ 7,480	$ 11,123	$ (939)	$ 19,922	$ 1,874
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	947							796					796				151	$ 262		262		262	303			303
Other comprehensive (loss) income	(283)											(251)	(251)				(32)
Share-based compensation expense	22						22						22
Dividends declared:
Preferred dividends			$ (26)	$ (10)					$ (26)	$ (10)				$ (26)	$ (10)								0			0
Common stock dividends declared	(306)							(306)					(306)							(200)		(200)
Issuances of stock	25						25						25
Repurchases of common stock	(57)						(57)						(57)
Noncontrolling interest activities:
Purchases	(16)						2						2				(18)
Acquisition	1																1
Equitization of long-term debt for deficit held by NCI	22																22
Ending balance at Mar. 31, 2020	22,115					2,258	7,472	11,577				(1,190)	20,117				1,998		1,660	5,518	(16)	7,162	5,051	22	866	4,186	(23)
Beginning Balance at Dec. 31, 2020	24,934	[1]				3,147	7,053	13,673				(500)	23,373				1,561		1,660	6,080	(10)	7,730	5,144	22	866	4,287	(31)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	928							895					895				33	$ 212		212		212	407			407
Other comprehensive (loss) income	115											101	101				14
Share-based compensation expense	17						17						17
Dividends declared:
Preferred dividends				$ (10)	$ (11)					$ (10)	$ (11)				$ (10)	$ (11)							0			0
Common stock dividends declared	(333)							(333)					(333)										(50)			(50)
Conversion of series A preferred stock	0					(1,693)	1,693						0
Repurchases of common stock	(37)						(37)						(37)
Noncontrolling interest activities:
Sale	5						4						4				1
Ending balance at Mar. 31, 2021	$ 25,608					$ 1,454	$ 8,730	$ 14,214				$ (399)	$ 23,999				$ 1,609		$ 1,660	$ 6,292	$ (10)	$ 7,942	$ 5,501	$ 22	$ 866	$ 4,644	$ (31)

[1] Derived from audited financial statements.