CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues
Energy-related businesses	$ 1,381	$ 1,563	$ 1,350
Utilities	9,448	8,539	8,290
Total revenues	10,829	10,102	9,640
Operating expenses
Operation and maintenance	(3,466)	(3,150)	(2,947)
Depreciation and amortization	(1,569)	(1,491)	(1,436)
Franchise fees and other taxes	(496)	(472)	(436)
Write-off of wildfire regulatory asset	0	0	(351)
Impairment losses	(43)	(1,122)	(72)
Gain on sale of assets	63	513	2
Other Income, net	77	58	220
Operating expenses
Impairment losses	43	1,122	72
Write-off of wildfire regulatory asset	0	0	351
Interest income	87	85	24
Interest expense	(1,077)	(886)	(622)
Income before income taxes	1,734	714	1,248
Income tax (expense) benefit	(315)	49	(938)
Equity earnings	580	175	72
Net of income tax	1,999	938	382
Income (loss) from discontinued operations, net of income tax	363	188	(31)
Net income	2,362	1,126	351
Earnings attributable to noncontrolling interest	(164)	(76)	(94)
Preferred dividends of subsidiary	(1)	(1)	(1)
Mandatory convertible preferred stock dividends	(142)	(125)	0
Earnings attributable to common shares	$ 2,055	$ 924	$ 256
Earnings Per Share, Basic [Abstract]
Earnings from continuing operations attributable to common shares	$ 6.22	$ 2.86	$ 1.25
Earnings (losses) from discontinued operations attributable to common shares	1.18	0.59	(0.23)
Basic earnings per common share (in shares)	$ 7.40	$ 3.45	$ 1.02
Weighted-average number of shares outstanding, basic (in shares)	277,904	268,072	251,545
Earnings Per Share, Diluted [Abstract]
Earnings from continuing operations (in dollars per share)	$ 6.13	$ 2.84	$ 1.24
Earnings (losses) from discontinued operations (in dollars per share)	1.16	0.58	(0.23)
Diluted earnings per common share (in dollars per share)	$ 7.29	$ 3.42	$ 1.01
Weighted-average number of shares outstanding, diluted (in shares)	282,033	269,852	252,300
San Diego Gas and Electric Company [Member]
Revenues
Electric	$ 4,267	$ 4,003	$ 3,935
Natural Gas	658	565	541
Utilities	4,925	4,568	4,476
Operating expenses
Write-off of wildfire regulatory asset	0	0	(351)
Other Income, net	39	56	70
Operating expenses
Cost of electric fuel and purchased power	1,194	1,370	1,293
Cost of natural gas	176	152	164
Operation and maintenance	1,181	1,058	1,024
Depreciation and amortization	760	688	670
Franchise fees and other taxes	301	290	265
Write-off of wildfire regulatory asset	0	0	351
Total operating expenses	3,612	3,558	3,767
Operating income	1,313	1,010	709
Interest income	4	4	0
Interest expense	(411)	(221)	(203)
Income before income taxes	945	849	576
Income tax (expense) benefit	(171)	(173)	(155)
Net income	774	676	421
Earnings attributable to noncontrolling interest	(7)	(7)	(14)
Earnings attributable to common shares	767	669	407
Southern California Gas Company [Member]
Revenues
Utilities	4,525	3,962	3,785
Operating expenses
Impairment losses	(37)	0	0
Other Income, net	(55)	15	31
Operating expenses
Cost of natural gas	977	1,048	1,025
Operation and maintenance	1,780	1,613	1,474
Depreciation and amortization	602	556	515
Franchise fees and other taxes	173	154	144
Impairment losses	37	0	0
Total operating expenses	3,569	3,371	3,158
Operating income	956	591	627
Interest income	2	2	1
Interest expense	(141)	(115)	(102)
Income before income taxes	762	493	557
Income tax (expense) benefit	(120)	(92)	(160)
Net income	642	401	397
Preferred dividends of subsidiary	(1)	(1)	(1)
Earnings attributable to common shares	641	400	396
Cost of natural gas [Member]
Operating expenses
Operating expenses	(1,139)	(1,208)	(1,190)
Cost of electric fuel and purchased power [Member]
Operating expenses
Operating expenses	(1,188)	(1,358)	(1,293)
Energy-related businesses cost of sales [Member]
Operating expenses
Operating expenses	$ (344)	$ (357)	$ (291)