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 C 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)	3,252								3,073					3,073				179	$ 455		455		455	450			450
Other comprehensive (loss) income	368												397	397				(29)				4	4	1				1
Share-based compensation expense	36							36						36
Dividends declared:
Preferred dividends			$ (52)	$ (19)	$ (2)					$ (52)	$ (19)	$ (2)			$ (52)	$ (19)	$ (2)							(1)			(1)
Common stock dividends declared	(611)								(611)					(611)							(200)		(200)	(50)			(50)
Preferred dividends of subsidiary	(1)								(1)					(1)
Issuances of stock	35				889		$ 889	35						35			889
Repurchases of common stock	(64)							(64)						(64)
Noncontrolling interest activities:
Purchases	(27)							3						3				(30)
Distributions	(1)																	(1)
Acquisition	1																	1
Equitization of long-term debt for deficit held by NCI	22																	22
Deconsolidation	(236)																	(236)
Ending 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)
Beginning 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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2,305								2,277					2,277				28			193		193	147			147
Other comprehensive (loss) income	651												648	648				3				4	4	1				1
Share-based compensation expense	14							14						14
Dividends declared:
Preferred dividends			$ (26)	(9)	(2)					$ (26)	(9)	(2)			$ (26)	(9)	(2)							(1)			(1)
Common stock dividends declared	(305)								(305)					(305)										(50)			(50)
Preferred dividends of subsidiary	(1)								(1)					(1)
Issuances of stock	10				889		$ 889	10						10			889
Repurchases of common stock	(7)							(7)						(7)
Noncontrolling interest activities:
Purchases	(11)							1						1				(12)
Distributions	(1)																	(1)
Deconsolidation	(236)																	(236)
Ending 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)
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)	1,383								1,340					1,340				43	$ 398		398		398	502			502
Other comprehensive (loss) income	103												94	94				9						1				1
Share-based compensation expense	34							34						34
Dividends declared:
Preferred dividends				(19)	(22)						(19)	(22)				(19)	(22)							(1)			(1)
Common stock dividends declared	(680)								(680)					(680)										(75)			(75)
Conversion of series A preferred stock	0					(1,693)		1,693						0
Preferred dividends of subsidiary	(1)								(1)					(1)
Issuances of stock	5							5						5
Repurchases of common stock	(38)							(38)						(38)
Noncontrolling interest activities:
Purchases	(12)							1,399					(38)	1,361				(1,373)
Sale	5							4						4				1
Ending 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)
Beginning 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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	455								445					445				10			186		186	95			95
Other comprehensive (loss) income	(12)												(7)	(7)				(5)						1				1
Share-based compensation expense	17							17						17
Dividends declared:
Preferred dividends				$ (9)	$ (11)						$ (9)	$ (11)				$ (9)	$ (11)							(1)			(1)
Common stock dividends declared	(347)								(347)					(347)										(25)			(25)
Preferred dividends of subsidiary	(1)								(1)					(1)
Issuances of stock	5							5						5
Repurchases of common stock	(1)							(1)						(1)
Noncontrolling interest activities:
Purchases	(12)							1,399					(38)	1,361				(1,373)
Ending 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)

[1] Derived from audited financial statements.