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]	Preferred stock [Member] Series A Preferred Stock [Member]	Preferred stock [Member] Series B Preferred Stock [Member]	Preferred stock [Member] Series C Preferred Stock [Member]	Common Stock [Member]	Common Stock [Member] Series A Preferred Stock [Member]	Common Stock [Member] Series B Preferred 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)	3,673												3,472					3,472				201	$ 633		633		633	426			426
Other comprehensive (loss) income	406																431	431				(25)				4	4	1				1
Share-based compensation expense	57									57								57
Dividends declared:
Preferred dividends			$ (78)	$ (29)	$ (14)									$ (78)	$ (29)	$ (14)			$ (78)	$ (29)	$ (14)							(1)			(1)
Common stock dividends declared	(913)												(913)					(913)							(200)		(200)	(100)			(100)
Preferred dividends of subsidiary	(1)												(1)					(1)
Issuances of stock	33				889				$ 889	33								33			889
Repurchases of common stock	(565)									(565)								(565)
Noncontrolling interest activities:
Purchases	(184)									29							(5)	24				(208)
Distributions	(1)																					(1)
Acquisition	1																					1
Equitization of long-term debt for deficit held by NCI	22																					22
Deconsolidation	(236)																					(236)
Ending balance at Sep. 30, 2020	24,856					3,147				7,034			13,560				(513)	23,228				1,628		1,660	5,889	(12)	7,537	5,074	22	866	4,208	(22)
Beginning Balance at Jun. 30, 2020	25,386					3,147				7,490			13,511				(542)	23,606				1,780		1,660	5,711	(12)	7,359	5,148	22	866	4,282	(22)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	421												399					399				22			178		178	(24)			(24)
Other comprehensive (loss) income	38																34	34				4
Share-based compensation expense	19									19								19
Dividends declared:
Preferred dividends			(26)	(10)	(12)									$ (26)	(10)	(12)			(26)	(10)	(12)							0			0
Common stock dividends declared	(302)												(302)					(302)										(50)			(50)
Repurchases of common stock	(501)									(501)								(501)
Noncontrolling interest activities:
Purchases	(157)									26							(5)	21				(178)
Ending balance at Sep. 30, 2020	24,856					3,147				7,034			13,560				(513)	23,228				1,628		1,660	5,889	(12)	7,537	5,074	22	866	4,208	(22)
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)	751												703					703				48	$ 603		603		603	(624)			(624)
Other comprehensive (loss) income	121																114	114				7				1	1	2				2
Share-based compensation expense	48									48								48
Equity contribution from Sempra Energy																												800		800
Dividends declared:
Preferred dividends				(19)	(33)										$ (19)	(33)				$ (19)	(33)							(1)			(1)
Common stock dividends declared	(1,031)												(1,031)					(1,031)										(75)			(75)
Conversion of stock			$ 0	0			$ (1,693)	$ (565)			$ 1,693	$ 565							$ 0
Preferred dividends of subsidiary	(1)												(1)					(1)
Issuances of stock	5									5								5
Repurchases of common stock	(39)									(39)								(39)
Noncontrolling interest activities:
Purchases	(137)									1,462							(32)	1,430				(1,567)
Sale	5									4								4				1
Ending balance at Sep. 30, 2021	24,604					889				10,791			13,292				(418)	24,554				50		1,660	6,683	(9)	8,334	5,246	22	1,666	3,587	(29)
Beginning Balance at Jun. 30, 2021	25,692					1,454				10,150			14,291				(444)	25,451				241		1,660	6,478	(10)	8,128	5,571	22	866	4,713	(30)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(632)												(637)					(637)				5			205		205	(1,126)			(1,126)
Other comprehensive (loss) income	18																20	20				(2)				1	1	1				1
Share-based compensation expense	14									14								14
Equity contribution from Sempra Energy																												800		800
Dividends declared:
Preferred dividends					$ (11)											$ (11)					$ (11)							0			0
Common stock dividends declared	(351)												(351)					(351)
Conversion of stock				$ 0				$ (565)				$ 565
Repurchases of common stock	(1)									(1)								(1)
Noncontrolling interest activities:
Purchases	(125)									63							6	69				(194)
Ending balance at Sep. 30, 2021	$ 24,604					$ 889				$ 10,791			$ 13,292				$ (418)	$ 24,554				$ 50		$ 1,660	$ 6,683	$ (9)	$ 8,334	$ 5,246	$ 22	$ 1,666	$ 3,587	$ (29)

[1] Derived from audited financial statements.