CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total		Series A Preferred Stock [Member]	Series B Preferred Stock [Member]	Preferred stock [Member]	Preferred stock [Member] Series A 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]
Cumulative-effect adjustment from change in accounting principle	$ (1)							$ 2			$ (3)	$ (1)
Beginning Balance at Dec. 31, 2017	15,140				$ 0		$ 3,149	10,147			(626)	12,670			$ 2,470	$ 5,626		$ 1,338	$ 4,268	$ (8)	$ 5,598	$ 28	$ 3,907	$ 22	$ 866	$ 3,040	$ (21)
Net income (loss)	358							375				375			(17)	169			170		170	(1)	225			225
Other comprehensive (loss) income	99										84	84			15	4						4
Share-based compensation expense	15						15					15
Preferred stock dividends declared			$ (28)						$ (28)				$ (28)										0			0
Common stock dividends declared	(236)							(236)				(236)
Issuances of stock	1,291		1,693			$ 1,693	1,291					1,291	1,693
Repurchases of common stock	(19)						(19)					(19)
Noncontrolling interests activities: Distributions	(7)														(7)	(1)						(1)
Ending balance at Mar. 31, 2018	18,305				1,693		4,436	10,260			(545)	15,844			2,461	5,798		1,338	4,438	(8)	5,768	30	4,132	22	866	3,265	(21)
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	[1]			2,258		5,540	10,104			(764)	17,138			2,110	6,115	[1]	1,338	4,687	(10)	6,015	100	4,258	22	866	3,390	(20)
Net income (loss)	518							477				477			41	177			176		176	1	264			264
Other comprehensive (loss) income	(11)										(11)	(11)				1						1
Share-based compensation expense	21						21					21
Preferred stock dividends declared			$ (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 interests activities: Distributions	(4)														(4)
Noncontrolling interests activities: Purchase	(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)

[1] Derived from audited financial statements.