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]
Beginning 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			257		257	94	421		407		407	14	397			397
Other comprehensive loss	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)
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 principle					(3)
Net income	1,126			1,050		1,050	76	676		669		669	7	401			401
Other comprehensive loss	(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)
Cumulative-effect adjustment from change in accounting principle					(42)			0		2	(2)	0		(2)			2	(4)
Net income	2,362			2,198		2,198	164	774		767		767	7	642			642
Other comprehensive loss	(140)				(133)	(133)	(7)	(2)			(4)	(4)	2	1				1
Share-based compensation expense	75		75			75
Preferred stock dividends declared														(1)			(1)		$ (103)		$ (103)	$ (103)	$ (39)		$ (39)	$ (39)
Common stock dividends declared	(1,086)			(1,086)		(1,086)								(150)			(150)
Equity contribution from Sempra Energy								322	322			322
Preferred dividends of subsidiary	(1)			(1)		(1)
Issuances of stock	1,885		1,885			1,885
Repurchases of common stock	(26)		(26)			(26)
Equity contributed by noncontrolling interests	175						175	175					175
Distributions	(98)		5			5	(103)	(3)					(3)
Purchases of noncontrolling interests	(30)		(3)			(3)	(27)
Sale of noncontrolling interests, net of offering costs	5		4			4	1
Increase from acquisition from noncontrolling interests	3						3
Decrease from divestiture from noncontrolling interests	(440)						(440)	(281)					(281)
Ending balance at Dec. 31, 2019	$ 21,805	$ 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)