CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues
Energy-related businesses	$ 1,345	$ 1,381	$ 1,563
Utilities	10,025	9,448	8,539
Total revenues	11,370	10,829	10,102
Operating expenses
Operation and maintenance	(3,940)	(3,466)	(3,150)
Aliso canyon litigation and regulatory matters	(307)	0	0
Depreciation and amortization	(1,666)	(1,569)	(1,491)
Franchise fees and other taxes	(543)	(496)	(472)
Impairment losses	(1)	(43)	(1,122)
(Loss) gain on sale of assets	(3)	63	513
Operating expenses
Aliso canyon litigation and regulatory matters	307	0	0
Impairment losses	1	43	1,122
Other (expense) income, net	(48)	77	58
Interest income	96	87	85
Interest expense	(1,081)	(1,077)	(886)
Income before income taxes	1,489	1,734	714
Income tax (expense) benefit	(249)	(315)	49
Equity earnings	1,015	580	175
Net of income tax	2,255	1,999	938
Income from discontinued operations, net of income tax	1,850	363	188
Net income	4,105	2,362	1,126
Earnings attributable to noncontrolling interest	(172)	(164)	(76)
Preferred dividends	(168)	(142)	(125)
Preferred dividends of subsidiary	(1)	(1)	(1)
Earnings attributable to common shares	$ 3,764	$ 2,055	$ 924
Basic EPS:
Earnings from continuing operations attributable to common shares	$ 6.61	$ 6.22	$ 2.86
Earnings (losses) from discontinued operations attributable to common shares	6.32	1.18	0.59
Basic earnings per common share (in shares)	$ 12.93	$ 7.40	$ 3.45
Weighted-average number of shares outstanding, basic (in shares)	291,077	277,904	268,072
Diluted EPS:
Earnings from continuing operations (in dollars per share)	$ 6.58	$ 6.13	$ 2.84
Earnings (losses) from discontinued operations (in dollars per share)	6.30	1.16	0.58
Diluted earnings per common share (in dollars per share)	$ 12.88	$ 7.29	$ 3.42
Weighted-average number of shares outstanding, diluted (in shares)	292,252	282,033	269,852
San Diego Gas and Electric Company [Member]
Revenues
Electric	$ 4,619	$ 4,267	$ 4,003
Natural Gas	694	658	565
Utilities	5,313	4,925	4,568
Operating expenses
Cost of electric fuel and purchased power	1,191	1,194	1,370
Cost of natural gas	162	176	152
Operation and maintenance	1,455	1,181	1,058
Depreciation and amortization	801	760	688
Franchise fees and other taxes	331	301	290
Total operating expenses	3,940	3,612	3,558
Operating income	1,373	1,313	1,010
Other (expense) income, net	52	39	56
Interest income	2	4	4
Interest expense	(413)	(411)	(221)
Income before income taxes	1,014	945	849
Income tax (expense) benefit	(190)	(171)	(173)
Net income	824	774	676
Earnings attributable to noncontrolling interest	0	(7)	(7)
Earnings attributable to common shares	824	767	669
Southern California Gas Company [Member]
Revenues
Utilities	4,748	4,525	3,962
Operating expenses
Aliso canyon litigation and regulatory matters	(307)	0	0
Impairment losses	0	(37)	0
Operating expenses
Cost of natural gas	783	977	1,048
Operation and maintenance	2,029	1,780	1,613
Aliso canyon litigation and regulatory matters	307	0	0
Depreciation and amortization	654	602	556
Franchise fees and other taxes	190	173	154
Impairment losses	0	37	0
Total operating expenses	3,963	3,569	3,371
Operating income	785	956	591
Other (expense) income, net	(28)	(55)	15
Interest income	2	2	2
Interest expense	(158)	(141)	(115)
Income before income taxes	601	762	493
Income tax (expense) benefit	(96)	(120)	(92)
Net income	505	642	401
Preferred dividends	(1)	(1)	(1)
Earnings attributable to common shares	504	641	400
Cost of natural gas [Member]
Operating expenses
Operating expenses	(925)	(1,139)	(1,208)
Cost of electric fuel and purchased power [Member]
Operating expenses
Operating expenses	(1,187)	(1,188)	(1,358)
Energy-related businesses cost of sales [Member]
Operating expenses
Operating expenses	$ (276)	$ (344)	$ (357)