CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
REVENUES
Utilities	$ 2,264	$ 2,213	$ 6,700	$ 6,768
Energy-related businesses	271	268	613	762
Total revenues	2,535	2,481	7,313	7,530
Utilities:
Cost of natural gas	(208)	(201)	(702)	(786)
Cost of electric fuel and purchased power	(604)	(666)	(1,680)	(1,645)
Energy-related businesses:
Cost of natural gas, electric fuel and purchased power	(95)	(91)	(213)	(262)
Other cost of sales	(32)	(34)	(293)	(111)
Operation and maintenance	(703)	(701)	(2,109)	(2,072)
Depreciation and amortization	(328)	(315)	(970)	(925)
Franchise fees and other taxes	(108)	(111)	(315)	(314)
Impairment losses	(132)	0	(154)	0
Plant closure adjustment	0	0	0	21
Gain on sale of assets	131	0	131	62
Equity earnings, before income tax	12	33	4	79
Remeasurement of equity method investment	617	0	617	0
Operating expenses
Impairment losses	132	0	154	0
Other income, net	26	12	98	88
Interest income	7	6	19	23
Interest expense	(136)	(143)	(421)	(416)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	982	270	1,325	1,272
Income tax expense	(282)	(15)	(284)	(276)
Equity earnings, net of income tax	19	27	69	64
Net (loss) income	719	282	1,110	1,060
(Earnings) losses attributable to noncontrolling interest	(97)	(34)	(118)	(79)
Preferred dividends of subsidiary	0	0	(1)	(1)
Earnings	$ 622	$ 248	$ 991	$ 980
Basic earnings per common share (in dollars per share)	$ 2.48	$ 1.00	$ 3.96	$ 3.95
Weighted-average number of shares outstanding, basic	250,386	248,432	250,073	248,090
Diluted earnings per common share (in dollars per share)	$ 2.46	$ 0.99	$ 3.93	$ 3.91
Weighted-average number of shares outstanding, diluted	252,405	251,024	251,976	250,665
Dividends declared per share of common stock (in dollars per share)	$ 0.76	$ 0.70	$ 2.27	$ 2.10
San Diego Gas and Electric Company [Member]
Operating revenues
Electric	$ 1,111	$ 1,140	$ 2,851	$ 2,819
Natural gas	98	90	341	349
Total operating revenues	1,209	1,230	3,192	3,168
Operating expenses
Cost of electric fuel and purchased power	364	427	926	906
Cost of natural gas	25	27	89	112
Operation and maintenance	268	251	780	723
Depreciation and amortization	161	152	478	446
Franchise fees and other taxes	68	73	190	193
Plant closure adjustment	0	0	0	(21)
Total operating expenses	886	930	2,463	2,359
Operating income	323	300	729	809
Other income, net	11	8	38	26
Interest expense	(49)	(51)	(145)	(155)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	285	257	622	680
Income tax expense	(91)	(75)	(204)	(217)
Net (loss) income	194	182	418	463
(Earnings) losses attributable to noncontrolling interest	(11)	(12)	1	(20)
(Losses) earnings attributable to common shares	183	170	419	443
Southern California Gas Company [Member]
Operating revenues
Total operating revenues	686	620	2,336	2,448
Energy-related businesses:
Impairment losses	(1)	0	(23)	0
Operating expenses
Cost of natural gas	171	163	571	626
Operation and maintenance	322	325	966	985
Depreciation and amortization	121	116	355	342
Franchise fees and other taxes	33	29	100	94
Impairment losses	1	0	23	0
Total operating expenses	648	633	2,015	2,047
Operating income	38	(13)	321	401
Other income, net	8	8	24	25
Interest income	0	0	0	3
Interest expense	(25)	(23)	(71)	(61)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	21	(28)	274	368
Income tax expense	(21)	20	(75)	(91)
Net (loss) income	0	(8)	199	277
Preferred dividend requirements	0	0	(1)	(1)
(Losses) earnings attributable to common shares	$ 0	$ (8)	$ 198	$ 276