CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net income	$ 282,000,000	$ 383,000,000	$ 1,060,000,000	$ 941,000,000
Comprehensive income, net of income tax
Preferred dividends of subsidiary	0	0	(1,000,000)	(1,000,000)
Before-Tax Amount [Member]
Net income	263,000,000	419,000,000	1,257,000,000	1,156,000,000
Comprehensive income, net of income tax
Foreign currency translation adjustments	(92,000,000)	(100,000,000)	(197,000,000)	(141,000,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	7,000,000	8,000,000	11,000,000	21,000,000
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	(128,000,000)	(4,000,000)	(122,000,000)	(24,000,000)
Other Comprehensive Income (Loss), Net of Tax, Total	(213,000,000)	(96,000,000)	(308,000,000)	(144,000,000)
Total Comprehensive Income	50,000,000	323,000,000	949,000,000	1,012,000,000
Preferred dividends of subsidiary			(1,000,000)	(1,000,000)
Total comprehensive income, after preferred dividends of subsidiaries			948,000,000	1,011,000,000
Income Tax (Expense) Benefit [Member]
Net income	(15,000,000)	(71,000,000)	(276,000,000)	(291,000,000)
Comprehensive income, net of income tax
Foreign currency translation adjustments	0	0	0	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(2,000,000)	(3,000,000)	(4,000,000)	(8,000,000)
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	50,000,000	1,000,000	48,000,000	9,000,000
Other Comprehensive Income (Loss), Net of Tax, Total	48,000,000	(2,000,000)	44,000,000	1,000,000
Total Comprehensive Income	33,000,000	(73,000,000)	(232,000,000)	(290,000,000)
Preferred dividends of subsidiary			0	0
Total comprehensive income, after preferred dividends of subsidiaries			(232,000,000)	(290,000,000)
Net-of-Tax Amount [Member]
Net income	248,000,000	348,000,000	981,000,000	865,000,000
Comprehensive income, net of income tax
Foreign currency translation adjustments	(92,000,000)	(100,000,000)	(197,000,000)	(141,000,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	5,000,000	5,000,000	7,000,000	13,000,000
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	(78,000,000)	(3,000,000)	(74,000,000)	(15,000,000)
Other Comprehensive Income (Loss), Net of Tax, Total	(165,000,000)	(98,000,000)	(264,000,000)	(143,000,000)
Total Comprehensive Income	83,000,000	250,000,000	717,000,000	722,000,000
Preferred dividends of subsidiary			(1,000,000)	(1,000,000)
Total comprehensive income, after preferred dividends of subsidiaries			716,000,000	721,000,000
Noncontrolling Interests [Member]
Net income	34,000,000	35,000,000	79,000,000	76,000,000
Comprehensive income, net of income tax
Foreign currency translation adjustments	(8,000,000)	(11,000,000)	(21,000,000)	(12,000,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	(3,000,000)	3,000,000	(2,000,000)	2,000,000
Other Comprehensive Income (Loss), Net of Tax, Total	(11,000,000)	(8,000,000)	(23,000,000)	(10,000,000)
Total Comprehensive Income	23,000,000	27,000,000	56,000,000	66,000,000
Preferred dividends of subsidiary			0	0
Total comprehensive income, after preferred dividends of subsidiaries			56,000,000	66,000,000
Total Equity [Member]
Net income	282,000,000	383,000,000	1,060,000,000	941,000,000
Comprehensive income, net of income tax
Foreign currency translation adjustments	(100,000,000)	(111,000,000)	(218,000,000)	(153,000,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	5,000,000	5,000,000	7,000,000	13,000,000
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	(81,000,000)	0	(76,000,000)	(13,000,000)
Other Comprehensive Income (Loss), Net of Tax, Total	(176,000,000)	(106,000,000)	(287,000,000)	(153,000,000)
Total Comprehensive Income	106,000,000	277,000,000	773,000,000	788,000,000
Preferred dividends of subsidiary			(1,000,000)	(1,000,000)
Total comprehensive income, after preferred dividends of subsidiaries			772,000,000	787,000,000
San Diego Gas and Electric Company [Member]
Net income	182,000,000	169,000,000	463,000,000	399,000,000
San Diego Gas and Electric Company [Member] | Before-Tax Amount [Member]
Net income	245,000,000	222,000,000	660,000,000	596,000,000
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		1,000,000		3,000,000
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	0	0		0
Other Comprehensive Income (Loss), Net of Tax, Total	0	1,000,000		3,000,000
Total Comprehensive Income	245,000,000	223,000,000	660,000,000	599,000,000
San Diego Gas and Electric Company [Member] | Income Tax (Expense) Benefit [Member]
Net income	(75,000,000)	(65,000,000)	(217,000,000)	(217,000,000)
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		0		(1,000,000)
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	0	0		0
Other Comprehensive Income (Loss), Net of Tax, Total	0	0		(1,000,000)
Total Comprehensive Income	(75,000,000)	(65,000,000)	(217,000,000)	(218,000,000)
San Diego Gas and Electric Company [Member] | Net-of-Tax Amount [Member]
Net income	170,000,000	157,000,000	443,000,000	379,000,000
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		1,000,000		2,000,000
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	0	0		0
Other Comprehensive Income (Loss), Net of Tax, Total	0	1,000,000		2,000,000
Total Comprehensive Income	170,000,000	158,000,000	443,000,000	381,000,000
San Diego Gas and Electric Company [Member] | Noncontrolling Interests [Member]
Net income	12,000,000	12,000,000	20,000,000	20,000,000
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		0		0
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	(1,000,000)	4,000,000		3,000,000
Other Comprehensive Income (Loss), Net of Tax, Total	(1,000,000)	4,000,000		3,000,000
Total Comprehensive Income	11,000,000	16,000,000	20,000,000	23,000,000
San Diego Gas and Electric Company [Member] | Total Equity [Member]
Net income	182,000,000	169,000,000	463,000,000	399,000,000
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		1,000,000		2,000,000
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	(1,000,000)	4,000,000		3,000,000
Other Comprehensive Income (Loss), Net of Tax, Total	(1,000,000)	5,000,000		5,000,000
Total Comprehensive Income	181,000,000	174,000,000	463,000,000	404,000,000
Southern California Gas Company [Member]
Net income	(8,000,000)	98,000,000	277,000,000	257,000,000
Southern California Gas Company [Member] | Before-Tax Amount [Member]
Net income	(28,000,000)	142,000,000	368,000,000	367,000,000
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		4,000,000		4,000,000
Other Comprehensive Income (Loss), Net of Tax, Total		4,000,000		4,000,000
Total Comprehensive Income	(28,000,000)	146,000,000	368,000,000	371,000,000
Southern California Gas Company [Member] | Income Tax (Expense) Benefit [Member]
Net income	20,000,000	(44,000,000)	(91,000,000)	(110,000,000)
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		(2,000,000)		(2,000,000)
Other Comprehensive Income (Loss), Net of Tax, Total		(2,000,000)		(2,000,000)
Total Comprehensive Income	20,000,000	(46,000,000)	(91,000,000)	(112,000,000)
Southern California Gas Company [Member] | Net-of-Tax Amount [Member]
Net income	(8,000,000)	98,000,000	277,000,000	257,000,000
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		2,000,000		2,000,000
Other Comprehensive Income (Loss), Net of Tax, Total		2,000,000		2,000,000
Total Comprehensive Income	$ (8,000,000)	$ 100,000,000	$ 277,000,000	$ 259,000,000