CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	[1]	Dec. 31, 2016	[1]
Revenues
Energy-related businesses	$ 1,641,000,000	$ 1,431,000,000		$ 922,000,000
Utilities	10,046,000,000	9,776,000,000		9,261,000,000
Total revenues	11,687,000,000	11,207,000,000		10,183,000,000
Operating expenses
Operation and maintenance	(3,309,000,000)	(3,096,000,000)		(2,976,000,000)
Depreciation and amortization	(1,549,000,000)	(1,490,000,000)		(1,312,000,000)
Franchise fees and other taxes	(472,000,000)	(436,000,000)		(426,000,000)
Write-off of wildfire regulatory asset	0	(351,000,000)		0
Impairment losses	(1,122,000,000)	(72,000,000)		(153,000,000)
Gain on sale of assets	524,000,000	3,000,000		134,000,000
Operating expenses
Impairment losses	1,122,000,000	72,000,000		153,000,000
Write-off of wildfire regulatory asset	0	351,000,000		0
Remeasurement of equity method investment	0	0		617,000,000
Other income, net	72,000,000	233,000,000		138,000,000
Interest income	104,000,000	46,000,000		26,000,000
Interest expense	(925,000,000)	(659,000,000)		(553,000,000)
Income before income taxes	1,046,000,000	1,551,000,000		1,824,000,000
Income tax expense	(96,000,000)	(1,276,000,000)		(389,000,000)
Equity earnings	176,000,000	76,000,000		84,000,000
Net income	1,126,000,000	351,000,000		1,519,000,000
(Earnings) losses attributable to noncontrolling interest	(76,000,000)	(94,000,000)		(148,000,000)
Preferred stock dividends	(125,000,000)	0		0
Preferred dividends of subsidiary	(1,000,000)	(1,000,000)		(1,000,000)
Earnings attributable to common shares	$ 924,000,000	$ 256,000,000		$ 1,370,000,000
Earnings Per Share, Basic [Abstract]
Basic earnings per common share (in dollars per share)	$ 3.45	$ 1.02		$ 5.48
Weighted-average number of shares outstanding, basic (in shares)	268,072	251,545		250,217
Earnings Per Share, Diluted [Abstract]
Diluted earnings per common share (in dollars per share)	$ 3.42	$ 1.01		$ 5.46
Weighted-average number of shares outstanding, diluted (in shares)	269,852	252,300		251,155
San Diego Gas and Electric Company [Member]
Revenues
Electric	$ 4,003,000,000	$ 3,935,000,000		$ 3,754,000,000
Regulated Operating Revenue, Gas	565,000,000	541,000,000		499,000,000
Utilities	4,568,000,000	4,476,000,000		4,253,000,000
Operating expenses
Write-off of wildfire regulatory asset	0	(351,000,000)		0
Operating expenses
Cost of electric fuel and purchased power	1,370,000,000	1,293,000,000		1,187,000,000
Cost of natural gas	152,000,000	164,000,000		127,000,000
Operation and maintenance	1,058,000,000	1,024,000,000		1,062,000,000
Depreciation and amortization	688,000,000	670,000,000		646,000,000
Franchise fees and other taxes	290,000,000	265,000,000		255,000,000
Write-off of wildfire regulatory asset	0	351,000,000		0
Total operating expenses	3,558,000,000	3,767,000,000		3,277,000,000
Operating income	1,010,000,000	709,000,000		976,000,000
Other income, net	56,000,000	70,000,000		64,000,000
Interest income	4,000,000	0		0
Interest expense	(221,000,000)	(203,000,000)		(195,000,000)
Income before income taxes	849,000,000	576,000,000		845,000,000
Income tax expense	(173,000,000)	(155,000,000)		(280,000,000)
Net income	676,000,000	421,000,000		565,000,000
(Earnings) losses attributable to noncontrolling interest	(7,000,000)	(14,000,000)		5,000,000
Earnings attributable to common shares	669,000,000	407,000,000		570,000,000
Southern California Gas Company [Member]
Revenues
Utilities	3,962,000,000	3,785,000,000		3,471,000,000
Operating expenses
Impairment losses	0	0		(22,000,000)
Operating expenses
Cost of natural gas	1,048,000,000	1,025,000,000		891,000,000
Operation and maintenance	1,613,000,000	1,474,000,000		1,391,000,000
Depreciation and amortization	556,000,000	515,000,000		476,000,000
Franchise fees and other taxes	154,000,000	144,000,000		140,000,000
Impairment losses	0	0		22,000,000
Total operating expenses	3,371,000,000	3,158,000,000		2,920,000,000
Operating income	591,000,000	627,000,000		551,000,000
Other income, net	15,000,000	31,000,000		38,000,000
Interest income	2,000,000	1,000,000		1,000,000
Interest expense	(115,000,000)	(102,000,000)		(97,000,000)
Income before income taxes	493,000,000	557,000,000		493,000,000
Income tax expense	(92,000,000)	(160,000,000)		(143,000,000)
Net income	401,000,000	397,000,000		350,000,000
Preferred stock dividends	(1,000,000)	(1,000,000)		(1,000,000)
Earnings attributable to common shares	400,000,000	396,000,000		349,000,000
Cost of electric fuel and purchased power [Member]
Operating expenses
Operating expenses	(2,323,000,000)	(2,281,000,000)		(2,188,000,000)
Cost of natural gas [Member]
Operating expenses
Operating expenses	(1,208,000,000)	(1,190,000,000)		(1,067,000,000)
Cost of natural gas, electric fuel and purchased power [Member]
Operating expenses
Operating expenses	(355,000,000)	(339,000,000)		(277,000,000)
Other cost of sales [Member]
Operating expenses
Operating expenses	$ (78,000,000)	$ (24,000,000)		$ (322,000,000)

[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.