CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
REVENUES
Utilities	$ 2,277	$ 2,264	$ 7,172	$ 6,700
Energy-related businesses	402	271	1,071	613
Total revenues	2,679	2,535	8,243	7,313
Utilities:
Cost of electric fuel and purchased power	(650)	(604)	(1,730)	(1,680)
Cost of natural gas	(190)	(208)	(903)	(702)
Energy-related businesses:
Cost of natural gas, electric fuel and purchased power	(97)	(95)	(226)	(213)
Other cost of sales	(21)	(32)	(5)	(293)
Operation and maintenance	(762)	(703)	(2,207)	(2,109)
Depreciation and amortization	(378)	(328)	(1,106)	(970)
Franchise fees and other taxes	(114)	(108)	(325)	(315)
Impairment of wildfire regulatory asset	(351)	0	(351)	0
Other impairment losses	(1)	(132)	(72)	(154)
Gain on sale of assets	2	131	2	131
Equity earnings, before income tax	10	12	31	4
Remeasurement of equity method investment	0	617	0	617
Operating expenses
Impairment of wildfire regulatory asset	351	0	351	0
Other impairment losses	1	132	72	154
Other income, net	41	26	301	98
Interest income	12	7	26	19
Interest expense	(165)	(136)	(493)	(421)
Income before income taxes and equity earnings (losses) of certain unconsolidated subsidiaries	15	982	1,185	1,325
Income tax benefit (expense)	84	(282)	(378)	(284)
Equity earnings (losses), net of income tax	3	19	(5)	69
Net income	102	719	802	1,110
(Earnings) losses attributable to noncontrolling interest	(45)	(97)	(44)	(118)
Preferred dividends of subsidiary	0	0	(1)	(1)
Earnings / Net Income	$ 57	$ 622	$ 757	$ 991
Basic earnings per common share (in dollars per share)	$ 0.23	$ 2.48	$ 3.01	$ 3.96
Weighted-average number of shares outstanding, basic	251,692	250,386	251,425	250,073
Diluted earnings per common share (in dollars per share)	$ 0.22	$ 2.46	$ 2.99	$ 3.93
Weighted-average number of shares outstanding, diluted	253,364	252,405	252,987	251,976
Dividends declared per share of common stock (in dollars per share)	$ 0.82	$ 0.76	$ 2.47	$ 2.27
San Diego Gas and Electric Company [Member]
Operating revenues
Electric	$ 1,131	$ 1,111	$ 2,952	$ 2,851
Natural gas	105	98	399	341
Total operating revenues	1,236	1,209	3,351	3,192
Energy-related businesses:
Impairment of wildfire regulatory asset	(351)		(351)	0
Operating expenses
Cost of electric fuel and purchased power	417	364	994	926
Cost of natural gas	29	25	132	89
Operation and maintenance	249	268	713	780
Depreciation and amortization	170	161	499	478
Franchise fees and other taxes	74	68	197	190
Impairment of wildfire regulatory asset	351		351	0
Total operating expenses	1,290	886	2,886	2,463
Operating (loss) income	(54)	323	465	729
Other income, net	16	11	49	38
Interest expense	(53)	(49)	(151)	(145)
Income before income taxes and equity earnings (losses) of certain unconsolidated subsidiaries	(91)	285	363	622
Income tax benefit (expense)	72	(91)	(72)	(204)
Net income	(19)	194	291	418
(Earnings) losses attributable to noncontrolling interest	(9)	(11)	(15)	1
Earnings attributable to common shares	(28)	183	276	419
Southern California Gas Company [Member]
Operating revenues
Total operating revenues	684	686	2,695	2,336
Energy-related businesses:
Other impairment losses	0	(1)	0	(23)
Operating expenses
Cost of natural gas	153	171	740	571
Operation and maintenance	355	322	1,044	966
Depreciation and amortization	132	121	384	355
Franchise fees and other taxes	34	33	107	100
Other impairment losses	0	1	0	23
Total operating expenses	674	648	2,275	2,015
Operating (loss) income	10	38	420	321
Other income, net	8	8	28	24
Interest income	1	0	1	0
Interest expense	(26)	(25)	(77)	(71)
Income before income taxes and equity earnings (losses) of certain unconsolidated subsidiaries	(7)	21	372	274
Income tax benefit (expense)	14	(21)	(103)	(75)
Net income	7	0	269	199
Dividends, Preferred Stock	0	0	1	1
Earnings attributable to common shares	$ 7	$ 0	268	198
Parent [Member]
Operating expenses
Preferred dividends of subsidiary			$ (1)	$ (1)