CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net income	$ 320,000,000	$ 292,000,000	$ 778,000,000	$ 558,000,000
Comprehensive income, net of income tax
Preferred dividends of subsidiary	(1,000,000)	(1,000,000)	(1,000,000)	(1,000,000)
Before-Tax Amount [Member]
Net income	394,000,000	363,000,000	994,000,000	737,000,000
Comprehensive income, net of income tax
Foreign currency translation adjustments	(43,000,000)	2,000,000	(105,000,000)	(41,000,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	2,000,000	8,000,000	4,000,000	13,000,000
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	95,000,000	(12,000,000)	6,000,000	(20,000,000)
Other Comprehensive Income (Loss), Net of Tax, Total	54,000,000	(2,000,000)	(95,000,000)	(48,000,000)
Total Comprehensive Income	448,000,000	361,000,000	899,000,000	689,000,000
Preferred dividends of subsidiary	(1,000,000)	(1,000,000)	(1,000,000)	(1,000,000)
Total comprehensive income, after preferred dividends of subsidiaries	447,000,000	360,000,000	898,000,000	688,000,000
Income Tax (Expense) Benefit [Member]
Net income	(98,000,000)	(93,000,000)	(261,000,000)	(220,000,000)
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	(1,000,000)	(3,000,000)	(2,000,000)	(5,000,000)
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	(36,000,000)	5,000,000	(2,000,000)	8,000,000
Other Comprehensive Income (Loss), Net of Tax, Total	(37,000,000)	2,000,000	(4,000,000)	3,000,000
Total Comprehensive Income	(135,000,000)	(91,000,000)	(265,000,000)	(217,000,000)
Preferred dividends of subsidiary	0	0	0	0
Total comprehensive income, after preferred dividends of subsidiaries	(135,000,000)	(91,000,000)	(265,000,000)	(217,000,000)
Net-of-Tax Amount [Member]
Net income	296,000,000	270,000,000	733,000,000	517,000,000
Comprehensive income, net of income tax
Foreign currency translation adjustments	(43,000,000)	2,000,000	(105,000,000)	(41,000,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	1,000,000	5,000,000	2,000,000	8,000,000
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	59,000,000	(7,000,000)	4,000,000	(12,000,000)
Other Comprehensive Income (Loss), Net of Tax, Total	17,000,000	0	(99,000,000)	(45,000,000)
Total Comprehensive Income	313,000,000	270,000,000	634,000,000	472,000,000
Preferred dividends of subsidiary	(1,000,000)	(1,000,000)	(1,000,000)	(1,000,000)
Total comprehensive income, after preferred dividends of subsidiaries	312,000,000	269,000,000	633,000,000	471,000,000
Noncontrolling Interests [Member]
Net income	24,000,000	22,000,000	45,000,000	41,000,000
Comprehensive income, net of income tax
Foreign currency translation adjustments	(5,000,000)	1,000,000	(13,000,000)	(1,000,000)
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	6,000,000	(1,000,000)	1,000,000	(1,000,000)
Other Comprehensive Income (Loss), Net of Tax, Total	1,000,000	0	(12,000,000)	(2,000,000)
Total Comprehensive Income	25,000,000	22,000,000	33,000,000	39,000,000
Preferred dividends of subsidiary	0	0	0	0
Total comprehensive income, after preferred dividends of subsidiaries	25,000,000	22,000,000	33,000,000	39,000,000
Total Equity [Member]
Net income	320,000,000	292,000,000	778,000,000	558,000,000
Comprehensive income, net of income tax
Foreign currency translation adjustments	(48,000,000)	3,000,000	(118,000,000)	(42,000,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	1,000,000	5,000,000	2,000,000	8,000,000
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	65,000,000	(8,000,000)	5,000,000	(13,000,000)
Other Comprehensive Income (Loss), Net of Tax, Total	18,000,000	0	(111,000,000)	(47,000,000)
Total Comprehensive Income	338,000,000	292,000,000	667,000,000	511,000,000
Preferred dividends of subsidiary	(1,000,000)	(1,000,000)	(1,000,000)	(1,000,000)
Total comprehensive income, after preferred dividends of subsidiaries	337,000,000	291,000,000	666,000,000	510,000,000
San Diego Gas and Electric Company [Member]
Net income	130,000,000	129,000,000	281,000,000	230,000,000
San Diego Gas and Electric Company [Member] | Before-Tax Amount [Member]
Net income	180,000,000	192,000,000	415,000,000	374,000,000
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), Derivatives Qualifying As Hedges, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Total	0	2,000,000	0	2,000,000
Total Comprehensive Income	180,000,000	194,000,000	415,000,000	376,000,000
San Diego Gas and Electric Company [Member] | Income Tax (Expense) Benefit [Member]
Net income	(54,000,000)	(69,000,000)	(142,000,000)	(152,000,000)
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		(1,000,000)		(1,000,000)
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Total	0	(1,000,000)	0	(1,000,000)
Total Comprehensive Income	(54,000,000)	(70,000,000)	(142,000,000)	(153,000,000)
San Diego Gas and Electric Company [Member] | Net-of-Tax Amount [Member]
Net income	126,000,000	123,000,000	273,000,000	222,000,000
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		1,000,000		1,000,000
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Total	0	1,000,000	0	1,000,000
Total Comprehensive Income	126,000,000	124,000,000	273,000,000	223,000,000
San Diego Gas and Electric Company [Member] | Noncontrolling Interests [Member]
Net income	4,000,000	6,000,000	8,000,000	8,000,000
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	3,000,000	(1,000,000)	1,000,000	(1,000,000)
Other Comprehensive Income (Loss), Net of Tax, Total	3,000,000	(1,000,000)	1,000,000	(1,000,000)
Total Comprehensive Income	7,000,000	5,000,000	9,000,000	7,000,000
San Diego Gas and Electric Company [Member] | Total Equity [Member]
Net income	130,000,000	129,000,000	281,000,000	230,000,000
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		1,000,000		1,000,000
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	3,000,000	(1,000,000)	1,000,000	(1,000,000)
Other Comprehensive Income (Loss), Net of Tax, Total	3,000,000	0	1,000,000	0
Total Comprehensive Income	133,000,000	129,000,000	282,000,000	230,000,000
Southern California Gas Company [Member]
Net income	71,000,000	81,000,000	285,000,000	159,000,000
Southern California Gas Company [Member] | Before-Tax Amount [Member]
Net income	87,000,000	109,000,000	396,000,000	225,000,000
Comprehensive income, net of income tax
Total Comprehensive Income	87,000,000	109,000,000	396,000,000	225,000,000
Southern California Gas Company [Member] | Income Tax (Expense) Benefit [Member]
Net income	(16,000,000)	(28,000,000)	(111,000,000)	(66,000,000)
Comprehensive income, net of income tax
Total Comprehensive Income	(16,000,000)	(28,000,000)	(111,000,000)	(66,000,000)
Southern California Gas Company [Member] | Net-of-Tax Amount [Member]
Net income	71,000,000	81,000,000	285,000,000	159,000,000
Comprehensive income, net of income tax
Total Comprehensive Income	$ 71,000,000	$ 81,000,000	$ 285,000,000	$ 159,000,000