CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
REVENUES
Utilities		$ 2,213	$ 2,463	$ 6,768	$ 7,318
Energy-related businesses		268	352	762	970
Total revenues		2,481	2,815	7,530	8,288
Utilities [Abstract]
Cost of natural gas		(201)	(293)	(786)	(1,308)
Cost of electric fuel and purchased power		(666)	(680)	(1,645)	(1,761)
Energy-related businesses [Abstract]
Cost of natural gas, electric fuel and purchased power		(91)	(163)	(262)	(427)
Other cost of sales		(34)	(42)	(111)	(122)
Operation and maintenance		(701)	(726)	(2,072)	(2,131)
Depreciation and amortization		(315)	(292)	(925)	(866)
Plant closure adjustment (loss)		0	0	21	13
Franchise fees and other taxes		(111)	(104)	(314)	(301)
Gain on sale of equity interest and assets		0	19	62	48
Equity (losses) earnings before income tax
Equity (losses) earnings, other		33	22	79	62
Other income (expense), net		12	29	88	118
Interest income		6	6	23	15
Interest expense		(143)	(144)	(416)	(418)
Income (loss) before income taxes and equity earnings of certain unconsolidated subsidiaries		270	447	1,272	1,210
Income tax (expense) benefit		(15)	(71)	(276)	(291)
Equity earnings, net of income tax		27	7	64	22
Net income (loss)		282	383	1,060	941
Losses (earnings) attributable to noncontrolling interests		(34)	(35)	(79)	(76)
Preferred dividends of subsidiary		0	0	(1)	(1)
Earnings (losses)		$ 248	$ 348	$ 980	$ 864
Basic earnings per common share:
Basic earnings per common share		$ 1	$ 1.41	$ 3.95	$ 3.52
Basic earnings per common share, weighted-average number of shares outstanding (thousands)	[1]	248,432	246,137	248,090	245,703
Diluted earnings per common share:
Diluted earnings per common share		$ 0.99	$ 1.39	$ 3.91	$ 3.45
Diluted earnings per common share, weighted-average number of shares outstanding (thousands)		251,024	250,771	250,665	250,278
Dividends declared per share of common stock		$ 0.7	$ 0.66	$ 2.1	$ 1.98
San Diego Gas and Electric Company [Member]
Utility operating revenues
Electric		$ 1,140	$ 1,133	$ 2,819	$ 2,892
Natural gas		90	100	349	391
Total utility operating revenues		1,230	1,233	3,168	3,283
Utility operating expenses
Utility cost of natural gas		27	39	112	165
Utility cost of electric fuel and purchased power		427	441	906	1,036
Utility operation and maintenance		251	276	723	784
Utility depreciation		152	134	446	395
Utility franchise fees and other taxes		73	67	193	177
Utility plant closure (adjustment) loss		0	0	(21)	(13)
Total utility operating expenses		930	957	2,359	2,544
Utility operating income (loss)		300	276	809	739
Equity (losses) earnings before income tax
Other income (expense), net		8	9	26	29
Interest expense		(51)	(51)	(155)	(152)
Income (loss) before income taxes and equity earnings of certain unconsolidated subsidiaries		257	234	680	616
Income tax (expense) benefit		(75)	(65)	(217)	(217)
Net income (loss)		182	169	463	399
Losses (earnings) attributable to noncontrolling interests		(12)	(12)	(20)	(20)
Earnings (losses)		170	157	443	379
Southern California Gas Company [Member]
Utility operating revenues
Total utility operating revenues		620	855	2,448	2,857
Utility operating expenses
Utility cost of natural gas		163	237	626	1,066
Utility operation and maintenance		325	326	985	968
Utility depreciation		116	109	342	321
Utility franchise fees and other taxes		29	30	94	98
Total utility operating expenses		633	702	2,047	2,453
Utility operating income (loss)		(13)	153	401	404
Equity (losses) earnings before income tax
Other income (expense), net		8	6	25	13
Interest income		0	0	3	0
Interest expense		(23)	(17)	(61)	(50)
Income (loss) before income taxes and equity earnings of certain unconsolidated subsidiaries		(28)	142	368	367
Income tax (expense) benefit		20	(44)	(91)	(110)
Net income (loss)		(8)	98	277	257
Earnings (losses)		(8)	98	277	257
Preferred dividend requirements		0	0	(1)	(1)
Earnings (losses) attributable to common shares		$ (8)	$ 98	$ 276	$ 256

[1] Includes fully vested restricted stock units of 504 and 222 held in our Deferred Compensation Plan for the three months ended September 30, 2015 and 2014, respectively, and 486 and 209 for the nine months ended September 30, 2015 and 2014, respectively. These fully vested restricted stock units are included in weighted-average common shares outstanding for basic EPS because there are no conditions under which the corresponding shares will not be issued.