CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total		Series A Preferred Stock [Member]	Series B 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]	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]	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]	San Diego Gas and Electric Company [Member] Noncontrolling Interest [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]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment from change in accounting principle	$ 15						$ 57			$ (42)	$ 15				$ 0		$ 2	$ (2)	$ 0		$ (2)			$ 2	$ (4)
Beginning Balance at Dec. 31, 2018	19,248				$ 2,258	$ 5,540	10,104			(764)	17,138			$ 2,110	6,115	$ 1,338	4,687	(10)	6,015	$ 100	4,258	$ 22	$ 866	3,390	(20)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	518						477				477			41	177		176		176	1	264			264
Other comprehensive (loss) income	(11)									(11)	(11)				1			0	0	1
Share-based compensation expense	21					21					21
Dividends declared:
Preferred dividends			$ (26)	$ (10)				$ (26)	$ (10)			$ (26)	$ (10)								0			0
Common stock dividends declared	(265)						(265)				(265)
Issuances of stock	24					24					24
Repurchases of common stock	(14)					(14)					(14)
Noncontrolling interest activities:
Noncontrolling interests activities: Distributions	(4)													(4)
Noncontrolling interests activities: Purchases	(26)					(3)					(3)			(23)
Ending balance at Mar. 31, 2019	19,470				2,258	5,568	10,337			(817)	17,346			2,124	6,293	1,338	4,865	(12)	6,191	102	4,520	22	866	3,656	(24)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment from change in accounting principle	(9)						(7)				(7)			(2)
Beginning Balance at Dec. 31, 2019	21,805	[1]			2,258	7,480	11,130			(939)	19,929			1,876	7,100	1,660	5,456	(16)	7,100	0	4,748	22	866	3,883	(23)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	947						796				796			151	262		262		262	0	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)		(200)
Issuances of stock	25					25					25
Repurchases of common stock	(57)					(57)					(57)
Noncontrolling interest activities:
Noncontrolling interests activities: Purchases	(16)					2					2			(18)
Noncontrolling interest activities: 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	$ 7,162	$ 1,660	$ 5,518	$ (16)	$ 7,162	$ 0	$ 5,051	$ 22	$ 866	$ 4,186	$ (23)

[1] Derived from audited financial statements.