CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total		Preferred Stock [Member]	Common Stock [Member]	Retained earnings [Member]	Accumulated other comprehensive income (loss) [Member]	Shareholders' equity [Member]	Non-controlling interests [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] Non-controlling interests [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]	Preferred Class A [Member]	Preferred Class A [Member] Preferred Stock [Member]	Preferred Class A [Member] Retained earnings [Member]	Preferred Class A [Member] Shareholders' equity [Member]	Preferred Class B [Member]	Preferred Class B [Member] Preferred Stock [Member]	Preferred Class B [Member] Retained earnings [Member]	Preferred Class B [Member] Shareholders' equity [Member]
Cumulative-effect adjustment from change in accounting priniciple	$ 107				$ 107		$ 107		$ 23			$ 23		$ 23		$ 15				$ 15
Beginning Balance at Dec. 31, 2015	12,579		$ 0	$ 2,621	9,994	$ (806)	11,809	$ 770	5,276		$ 1,338	3,893	$ (8)	5,223	$ 53	3,149		$ 22	$ 866	2,280	$ (19)
Net income	1,519	[1]			1,371		1,371	148	565	[1]		570		570	(5)	350	[1]			350
Other comprehensive (loss) income	52					38	38	14	10						10	(3)					(3)
Share-based compensation expense	52			52			52
Preferred stock dividends declared																(1)				(1)
Common stock dividends declared	(754)				(754)		(754)		(175)			(175)		(175)
Preferred dividends of subsidiary	(1)	[1]			(1)		(1)
Issuances of stock	104			104			104
Repurchases of common stock	(56)			(56)			(56)
Equity contributed by noncontrolling interests	3							3	2						2
Distributions	(65)							(65)	(23)						(23)
Sale of noncontrolling interests, net of offering costs	1,701			261		20	281	1,420
Ending balance at Dec. 31, 2016	15,241		0	2,982	10,717	(748)	12,951	2,290	5,678		1,338	4,311	(8)	5,641	37	3,510		22	866	2,644	(22)
Net income	351	[1]			257		257	94	421	[1]		407		407	14	397	[1]			397
Other comprehensive (loss) income	142					122	122	20	11						11	1					1
Share-based compensation expense	82			82			82
Preferred stock dividends declared																(1)				(1)
Common stock dividends declared	(826)				(826)		(826)		(450)			(450)		(450)
Preferred dividends of subsidiary	(1)	[1]			(1)		(1)
Issuances of stock	100			100			100
Repurchases of common stock	(15)			(15)			(15)
Equity contributed by noncontrolling interests	2							2	1						1
Distributions	(132)							(132)	(35)						(35)
Sale of noncontrolling interests, net of offering costs	196							196
Ending 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)
Cumulative-effect adjustment from change in accounting priniciple	(1)				2	(3)	(1)
Net income	1,126				1,050		1,050	76	676			669		669	7	401				401
Other comprehensive (loss) income	(133)					(135)	(135)	2	6				(2)	(2)	8	1					1
Share-based compensation expense	83			83			83
Preferred stock dividends declared																(1)				(1)		$ (105)		$ (105)	$ (105)	$ (20)		$ (20)	$ (20)
Common stock dividends declared	(969)				(969)		(969)		(250)			(250)		(250)		(50)				(50)
Preferred dividends of subsidiary	(1)				(1)		(1)
Issuances of stock	2,326			2,326			2,326															$ 1,693	$ 1,693		$ 1,693	$ 565	$ 565		$ 565
Repurchases of common stock	(21)			(21)			(21)
Equity contributed by noncontrolling interests	66							66	65						65
Distributions	(110)							(110)	(8)						(8)
Purchases of noncontrolling interests	(8)			(1)			(1)	(7)
Sale of noncontrolling interests, net of offering costs	90			4			4	86
Increase from acquisition from noncontrolling interests	13							13
Decrease from divestiture from noncontrolling interests	(486)							(486)
Ending 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)

[1] As adjusted for the retrospective adoption of ASU 2017-07, which we discuss in Note 2, and a reclassification to conform to current year presentation, which we discuss in Note 1.