CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
REVENUES
Utilities	$ 2,422us-gaap_RegulatedOperatingRevenue	$ 2,485us-gaap_RegulatedOperatingRevenue
Energy-related businesses	260us-gaap_UnregulatedOperatingRevenue	310us-gaap_UnregulatedOperatingRevenue
Total revenues	2,682	2,795
Utilities [Abstract]
Cost of natural gas	(346)us-gaap_CostOfNaturalGasPurchases	(620)us-gaap_CostOfNaturalGasPurchases
Cost of electric fuel and purchased power	(481)us-gaap_CostOfDomesticRegulatedElectric	(510)us-gaap_CostOfDomesticRegulatedElectric
Energy-related businesses [Abstract]
Cost of natural gas, electric fuel and purchased power	(98)	(138)
Other cost of sales	(35)	(38)
Operation and maintenance	(658)us-gaap_OtherCostAndExpenseOperating	(676)us-gaap_OtherCostAndExpenseOperating
Depreciation and amortization	(303)us-gaap_DepreciationAndAmortization	(286)us-gaap_DepreciationAndAmortization
Plant closure adjustment (loss)	21sre_LossFromPlantClosurePretax	13sre_LossFromPlantClosurePretax
Franchise fees and other taxes	(107)us-gaap_TaxesOther	(105)us-gaap_TaxesOther
Gain on sale of equity interest and assets	0us-gaap_GainLossOnDispositionOfAssets	27us-gaap_GainLossOnDispositionOfAssets
Equity (losses) earnings before income tax
Equity (losses) earnings, other	19	17
Other income (expense), net	39us-gaap_NonoperatingIncomeExpense	40us-gaap_NonoperatingIncomeExpense
Interest income	7us-gaap_InvestmentIncomeInterest	4us-gaap_InvestmentIncomeInterest
Interest expense	(134)us-gaap_InterestExpense	(136)us-gaap_InterestExpense
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	606	387
Income tax (expense) benefit	(163)us-gaap_IncomeTaxExpenseBenefit	(127)us-gaap_IncomeTaxExpenseBenefit
Equity earnings, net of income tax	15	6
Net income	458us-gaap_ProfitLoss	266us-gaap_ProfitLoss
Losses (earnings) attributable to noncontrolling interests	(21)	(19)
Earnings	437us-gaap_NetIncomeLoss	247us-gaap_NetIncomeLoss
Basic earnings per common share:
Basic earnings per common share	$ 1.76us-gaap_EarningsPerShareBasic	$ 1.01us-gaap_EarningsPerShareBasic
Basic earnings per common share, weighted-average number of shares outstanding (thousands)	247,722	245,277
Diluted earnings per common share:
Diluted earnings per common share	$ 1.74us-gaap_EarningsPerShareDiluted	$ 0.99us-gaap_EarningsPerShareDiluted
Diluted earnings per common share, weighted-average number of shares outstanding (thousands)	251,206	249,669
Dividends declared per share of common stock	$ 0.7	$ 0.66
San Diego Gas and Electric Company [Member]
Utility operating revenues
Electric	805	811
Natural gas	161	176
Total utility operating revenues	966	987
Utility operating expenses
Utility cost of natural gas	54	75
Utility cost of electric fuel and purchased power	228	266
Utility operation and maintenance	217	252
Utility depreciation	145	130
Utility franchise fees and other taxes	61	56
Utility plant closure (adjustment) loss	(21)	(13)
Total utility operating expenses	684	766
Utility operating income	282	221
Equity (losses) earnings before income tax
Other income (expense), net	9	13
Interest expense	(52)	(50)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	239	184
Income tax (expense) benefit	(88)	(83)
Net income	151	101
Losses (earnings) attributable to noncontrolling interests	(4)	(2)
Earnings	147	99
Southern California Gas Company [Member]
Utility operating revenues
Total utility operating revenues	1,048	1,085
Utility operating expenses
Utility cost of natural gas	267	508
Utility operation and maintenance	314	305
Utility depreciation	113	105
Utility franchise fees and other taxes	34	38
Total utility operating expenses	728	956
Utility operating income	320	129
Equity (losses) earnings before income tax
Other income (expense), net	8	4
Interest expense	(19)	(17)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	309	116
Income tax (expense) benefit	(95)	(38)
Net income	214	78
Earnings	$ 214	$ 78

Energy-related businesses cost of electric fuel and purchased power recorded during the period.

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