CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
REVENUES
Utilities		$ 1,994	$ 2,133	$ 4,436	$ 4,555
Energy-related businesses		162	234	342	494
Total revenues		2,156	2,367	4,778	5,049
Utilities [Abstract]
Cost of natural gas		(183)	(239)	(494)	(585)
Cost of electric fuel and purchased power		(561)	(498)	(1,076)	(979)
Energy-related businesses [Abstract]
Cost of natural gas, electric fuel and purchased power		(62)	(73)	(118)	(171)
Other cost of sales		(226)	(42)	(261)	(77)
Operation and maintenance		(727)	(713)	(1,428)	(1,371)
Depreciation and amortization		(314)	(307)	(642)	(610)
Franchise fees and other taxes		(96)	(96)	(207)	(203)
Plant closure adjustment		0	0	0	21
Gain on sale of equity interest and assets		0	62	0	62
Equity Earnings Losses Before Income Tax [Abstract]
Equity earnings (losses), before income tax		14	27	(8)	46
Other income (expense), net		23	37	72	76
Interest income		6	10	12	17
Interest expense		(142)	(139)	(285)	(273)
Income (loss) before income taxes and equity earnings of certain unconsolidated subsidiaries		(112)	396	343	1,002
Income tax expense (benefit)		(106)	98	36	261
Equity earnings, net of income tax		33	22	50	37
Net income (loss)		27	320	357	778
Losses (earnings) attributable to noncontrolling interests		(10)	(24)	(21)	(45)
Preferred dividends of subsidiary		(1)	(1)	(1)	(1)
Earnings (losses)		$ 16	$ 295	$ 335	$ 732
Basic earnings per common share:
Basic earnings per common share		$ 0.06	$ 1.19	$ 1.34	$ 2.95
Basic earnings per common share, weighted-average number of shares outstanding (thousands)	[1]	250,096	248,108	249,915	247,916
Diluted earnings per common share:
Diluted earnings per common share		$ 0.06	$ 1.17	$ 1.33	$ 2.91
Diluted earnings per common share, weighted-average number of shares outstanding (thousands)		251,938	251,491	251,686	251,264
Dividends declared per share of common stock		$ 0.75	$ 0.7	$ 1.51	$ 1.4
San Diego Gas and Electric Company [Member]
Utility operating revenues
Electric		$ 897	$ 874	$ 1,740	$ 1,679
Natural gas		95	98	243	259
Total utility operating revenues		992	972	1,983	1,938
Utility operating expenses
Utility cost of electric fuel and purchased power		314	251	562	479
Utility cost of natural gas		25	31	64	85
Utility operation and maintenance		266	255	512	472
Utility depreciation and amortization		158	149	317	294
Utility franchise fees and other taxes		59	59	122	120
Utility plant closure adjustment		0	0	0	(21)
Total utility operating expenses		822	745	1,577	1,429
Utility operating income (loss)		170	227	406	509
Equity Earnings Losses Before Income Tax [Abstract]
Other income (expense), net		13	9	27	18
Interest expense		(48)	(52)	(96)	(104)
Income (loss) before income taxes and equity earnings of certain unconsolidated subsidiaries		135	184	337	423
Income tax expense (benefit)		48	54	120	142
Net income (loss)		87	130	217	281
Losses (earnings) attributable to noncontrolling interests		13	(4)	12	(8)
Earnings (losses)		100	126	229	273
Southern California Gas Company [Member]
Utility operating revenues
Total utility operating revenues		617	780	1,650	1,828
Utility operating expenses
Utility cost of natural gas		147	196	400	463
Utility operation and maintenance		339	346	666	660
Utility depreciation and amortization		112	113	234	226
Utility franchise fees and other taxes		30	31	67	65
Total utility operating expenses		628	686	1,367	1,414
Utility operating income (loss)		(11)	94	283	414
Equity Earnings Losses Before Income Tax [Abstract]
Other income (expense), net		6	9	16	17
Interest income		0	3	0	3
Interest expense		(24)	(19)	(46)	(38)
Income (loss) before income taxes and equity earnings of certain unconsolidated subsidiaries		(29)	87	253	396
Income tax expense (benefit)		(29)	16	58	111
Net income (loss)		0	71	195	285
Earnings (losses)		0	71	195	285
Preferred dividend requirements		(1)	(1)	(1)	(1)
Earnings (losses) attributable to common shares		$ (1)	$ 70	$ 194	$ 284

[1] Includes 568 and 501 average fully vested restricted stock units held in our Deferred Compensation Plan for the three months ended June 30, 2016 and 2015, respectively, and 562 and 476 of such units for the six months ended June 30, 2016 and 2015, 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.