CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net income	$ 458	$ 266
Before-Tax Amount [Member]
Net income	600	374
Comprehensive income, net of income tax
Foreign currency translation adjustments	(62)	(43)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	2	5
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	(89)	(8)
Other Comprehensive Income (Loss), Net of Tax, Total	(149)	(46)
Total Comprehensive Income	451	328
Income Tax (Expense) Benefit [Member]
Net income	(163)	(127)
Comprehensive income, net of income tax
Foreign currency translation adjustments	0	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(1)	(2)
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	34	3
Other Comprehensive Income (Loss), Net of Tax, Total	33	1
Total Comprehensive Income	(130)	(126)
Net-of-Tax Amount [Member]
Net income	437	247
Comprehensive income, net of income tax
Foreign currency translation adjustments	(62)	(43)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	1	3
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	(55)	(5)
Other Comprehensive Income (Loss), Net of Tax, Total	(116)	(45)
Total Comprehensive Income	321	202
Noncontrolling Interests [Member]
Net income	21	19
Comprehensive income, net of income tax
Foreign currency translation adjustments	(8)	(2)
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	(5)	0
Other Comprehensive Income (Loss), Net of Tax, Total	(13)	(2)
Total Comprehensive Income	8	17
Total Equity [Member]
Net income	458	266
Comprehensive income, net of income tax
Foreign currency translation adjustments	(70)	(45)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	1	3
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	(60)	(5)
Other Comprehensive Income (Loss), Net of Tax, Total	(129)	(47)
Total Comprehensive Income	329	219
San Diego Gas and Electric Company [Member]
Net income	151	101
San Diego Gas and Electric Company [Member] | Before-Tax Amount [Member]
Net income	235	182
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	0
Other Comprehensive Income (Loss), Net of Tax, Total	0
Total Comprehensive Income	235	182
San Diego Gas and Electric Company [Member] | Income Tax (Expense) Benefit [Member]
Net income	(88)	(83)
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	0
Other Comprehensive Income (Loss), Net of Tax, Total	0
Total Comprehensive Income	(88)	(83)
San Diego Gas and Electric Company [Member] | Net-of-Tax Amount [Member]
Net income	147	99
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	0
Other Comprehensive Income (Loss), Net of Tax, Total	0
Total Comprehensive Income	147	99
San Diego Gas and Electric Company [Member] | Noncontrolling Interests [Member]
Net income	4	2
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	(2)
Other Comprehensive Income (Loss), Net of Tax, Total	(2)
Total Comprehensive Income	2	2
San Diego Gas and Electric Company [Member] | Total Equity [Member]
Net income	151	101
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	(2)
Other Comprehensive Income (Loss), Net of Tax, Total	(2)
Total Comprehensive Income	149	101
Southern California Gas Company [Member]
Net income	214	78
Southern California Gas Company [Member] | Before-Tax Amount [Member]
Net income	309	116
Comprehensive income, net of income tax
Total Comprehensive Income	309	116
Southern California Gas Company [Member] | Income Tax (Expense) Benefit [Member]
Net income	(95)	(38)
Comprehensive income, net of income tax
Total Comprehensive Income	(95)	(38)
Southern California Gas Company [Member] | Net-of-Tax Amount [Member]
Net income	214	78
Comprehensive income, net of income tax
Total Comprehensive Income	$ 214	$ 78