CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,262,000,000us-gaap_ProfitLoss	$ 1,088,000,000us-gaap_ProfitLoss	$ 920,000,000us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,156,000,000us-gaap_DepreciationAndAmortization	1,113,000,000us-gaap_DepreciationAndAmortization	1,090,000,000us-gaap_DepreciationAndAmortization
Deferred income taxes and investment tax credits	146,000,000	334,000,000	(43,000,000)
Gains on sale of assets	(62,000,000)us-gaap_GainLossOnDispositionOfAssets	(114,000,000)us-gaap_GainLossOnDispositionOfAssets	(7,000,000)us-gaap_GainLossOnDispositionOfAssets
Loss from plant closure	6,000,000sre_LossFromPlantClosure	200,000,000sre_LossFromPlantClosure	0sre_LossFromPlantClosure
Equity earnings	(119,000,000)	(55,000,000)	324,000,000
Fixed-price contracts and other derivatives	(25,000,000)	(21,000,000)	(26,000,000)
Other adjustments to reconcile net income to net cash provided by operating activities	108,000,000us-gaap_OtherNoncashIncomeExpense	13,000,000us-gaap_OtherNoncashIncomeExpense	41,000,000us-gaap_OtherNoncashIncomeExpense
Net change in other working capital components [Abstract]
Net change in accounts and notes receivable	44,000,000	(273,000,000)	36,000,000
Net change in income taxes, net	62,000,000	(38,000,000)	(29,000,000)
Net change in inventories	(133,000,000)us-gaap_IncreaseDecreaseInInventories	116,000,000us-gaap_IncreaseDecreaseInInventories	(78,000,000)us-gaap_IncreaseDecreaseInInventories
Net change in other current assets	(10,000,000)	15,000,000	180,000,000
Net change in regulatory balancing accounts	(317,000,000)	(198,000,000)	(291,000,000)
Net change in regulatory assets and liabilities	8,000,000	1,000,000	(6,000,000)
Net change in accounts payable	109,000,000	(28,000,000)	3,000,000
Net change in other current liabilities	(138,000,000)	(215,000,000)	(445,000,000)
Net change in other working capital components	(375,000,000)	(620,000,000)	(630,000,000)
Changes in other assets	19,000,000	(171,000,000)	219,000,000
Changes in other liabilities	45,000,000	17,000,000	130,000,000
Net cash provided by (used in) operating activities	2,161,000,000	1,784,000,000	2,018,000,000
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(3,123,000,000)	(2,572,000,000)	(2,956,000,000)
Expeditures for investments and acquisition of businesses, net of cash acquired	(240,000,000)us-gaap_PaymentsToAcquireInvestments	(22,000,000)us-gaap_PaymentsToAcquireInvestments	(445,000,000)us-gaap_PaymentsToAcquireInvestments
Proceeds from sale of assets	149,000,000	570,000,000	74,000,000
Proceeds from U.S. Treasury grants	0sre_ProceedsFromUsTreasuryGrants	238,000,000sre_ProceedsFromUsTreasuryGrants	0sre_ProceedsFromUsTreasuryGrants
Distributions from investments	13,000,000	152,000,000	207,000,000
Purchases of nuclear decommissioning and other trust assets	(613,000,000)	(697,000,000)	(738,000,000)
Proceeds from sales by nuclear decommissioning and other trusts	601,000,000	695,000,000	733,000,000
Decrease in restricted cash	155,000,000us-gaap_DecreaseInRestrictedCash	329,000,000us-gaap_DecreaseInRestrictedCash	196,000,000us-gaap_DecreaseInRestrictedCash
Increase in restricted cash	(152,000,000)us-gaap_IncreaseInRestrictedCash	(356,000,000)us-gaap_IncreaseInRestrictedCash	(218,000,000)us-gaap_IncreaseInRestrictedCash
Advances to unconsolidated affiliates	(185,000,000)	(14,000,000)	0
Decrease (increase) in notes receivable to unconsolidated affiliates, net	18,000,000	0	0
Other cash flows from investing activities	35,000,000	(12,000,000)	(11,000,000)
Net cash provided by (used in) investing activities	(3,342,000,000)	(1,689,000,000)	(3,158,000,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(598,000,000)us-gaap_PaymentsOfDividendsCommonStock	(606,000,000)us-gaap_PaymentsOfDividendsCommonStock	(550,000,000)us-gaap_PaymentsOfDividendsCommonStock
Preferred dividends paid by subsidiaries	(1,000,000)	(5,000,000)	(6,000,000)
Redemptions of preferred stock of subsidiary	0	(82,000,000)	0
Issuances of common stock	56,000,000	62,000,000	78,000,000
Repurchases of common stock	(38,000,000)	(45,000,000)	(16,000,000)
Issuances of debt (maturities greater than 90 days)	3,272,000,000us-gaap_ProceedsFromIssuanceOfDebt	2,081,000,000us-gaap_ProceedsFromIssuanceOfDebt	3,097,000,000us-gaap_ProceedsFromIssuanceOfDebt
Payments on long-term debt	(2,034,000,000)us-gaap_RepaymentsOfLongTermDebt	(1,788,000,000)us-gaap_RepaymentsOfLongTermDebt	(1,112,000,000)us-gaap_RepaymentsOfLongTermDebt
Proceeds from sale of noncontrolling interest, net of offering costs.	0	574,000,000	0
Increase (decrease) in short-term debt, net	412,000,000	256,000,000	(47,000,000)
Distributions to noncontrolling interests	(104,000,000)us-gaap_PaymentsToMinorityShareholders	(69,000,000)us-gaap_PaymentsToMinorityShareholders	(61,000,000)us-gaap_PaymentsToMinorityShareholders
Purchase of noncontrolling interests	(74,000,000)	0	(7,000,000)
Other cash flows from financing activities	(37,000,000)	(40,000,000)	(21,000,000)
Net cash provided by (used in) financing activities	854,000,000	338,000,000	1,355,000,000
Effect of exchange rate changes on cash and cash equivalents	(7,000,000)	(4,000,000)	8,000,000
Increase (decrease) in cash and cash equivalents	(334,000,000)	429,000,000	223,000,000
Cash and cash equivalents, beginning of period	904,000,000	475,000,000	252,000,000
Cash and cash equivalents, end of period	570,000,000	904,000,000	475,000,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	536,000,000us-gaap_InterestPaidNet	544,000,000us-gaap_InterestPaidNet	458,000,000us-gaap_InterestPaidNet
Income tax payments, net of refunds	102,000,000us-gaap_IncomeTaxesPaidNet	120,000,000us-gaap_IncomeTaxesPaidNet	130,000,000us-gaap_IncomeTaxesPaidNet
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Nuclear facility plant reclassified to regulatory asset, net of depreciation and amortization	0	512,000,000	0
Accrued capital expenditures	433,000,000	437,000,000	357,000,000
Capital expenditures recoverable by U. S. Treasury grants receivable	0	3,000,000	213,000,000
Sequestration of U.S. Treasury grants receivable	0	(23,000,000)	0
Dividends declared but not paid	166,000,000	157,000,000	150,000,000
Increase in capital lease obligations for investment in property, plant and equipment	60,000,000	0	0
Financing of build-to-suit property	61,000,000sre_FinancingOfBuildToSuitProperty	14,000,000sre_FinancingOfBuildToSuitProperty	0sre_FinancingOfBuildToSuitProperty
Acquisition Of Business [Abstract]
Assets acquired	0us-gaap_FairValueOfAssetsAcquired	13,000,000us-gaap_FairValueOfAssetsAcquired	29,000,000us-gaap_FairValueOfAssetsAcquired
Cash paid, net of cash acquired	0	(11,000,000)	(19,000,000)
Liabilities assumed	0us-gaap_LiabilitiesAssumed1	2,000,000us-gaap_LiabilitiesAssumed1	10,000,000us-gaap_LiabilitiesAssumed1
San Diego Gas and Electric Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	527,000,000	435,000,000	515,000,000
Adjustments to reconcile net income to net cash provided by operating activities:
Utility depreciation and amortization	530,000,000	494,000,000	490,000,000
Deferred income taxes and investment tax credits	223,000,000	171,000,000	285,000,000
Adjustment To Utility Loss From Plant Closure	6,000,000	200,000,000	0
Fixed-price contracts and other derivatives	(6,000,000)	(8,000,000)	(12,000,000)
Other adjustments to reconcile net income to net cash provided by operating activities	(23,000,000)	(37,000,000)	(63,000,000)
Net change in other working capital components [Abstract]
Net change in accounts and notes receivable	(47,000,000)	(40,000,000)	12,000,000
Net change in due to/from affiliates, net	(10,000,000)	38,000,000	29,000,000
Net change in income taxes, net	35,000,000	(50,000,000)	85,000,000
Net change in inventories	4,000,000	(14,000,000)	0
Net change in other current assets	(16,000,000)	7,000,000	208,000,000
Net change in regulatory balancing accounts	(208,000,000)	(140,000,000)	(322,000,000)
Net change in accounts payable	(23,000,000)	50,000,000	(42,000,000)
Net change in interest payable	0	4,000,000	5,000,000
Net change in other current liabilities	(104,000,000)	(260,000,000)	(419,000,000)
Net change in other working capital components	(369,000,000)	(405,000,000)	(444,000,000)
Changes in other assets	191,000,000	(150,000,000)	201,000,000
Changes in other liabilities	18,000,000	19,000,000	129,000,000
Net cash provided by (used in) operating activities	1,097,000,000	719,000,000	1,101,000,000
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(1,100,000,000)	(978,000,000)	(1,237,000,000)
Proceeds from sale of assets	0	11,000,000	0
Purchases of nuclear decommissioning trust assets	(609,000,000)	(692,000,000)	(732,000,000)
Proceeds from sales by nuclear decommissioning trusts	601,000,000	685,000,000	723,000,000
Decrease in restricted cash	96,000,000	82,000,000	92,000,000
Increase in restricted cash	(84,000,000)	(81,000,000)	(81,000,000)
Other cash flows from investing activities	(30,000,000)	0	0
Net cash provided by (used in) investing activities	(1,126,000,000)	(973,000,000)	(1,235,000,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(200,000,000)	0	0
Preferred dividends paid	0	(5,000,000)	(5,000,000)
Redemptions of preferred stock of subsidiary	0	(82,000,000)	0
Issuances of long-term debt	100,000,000	450,000,000	249,000,000
Payments on long-term debt	(24,000,000)	(199,000,000)	(10,000,000)
Increase (decrease) in short-term debt, net	187,000,000	59,000,000	0
Distributions to noncontrolling interests	(53,000,000)	(26,000,000)	(40,000,000)
Other cash flows from financing activities	0	(3,000,000)	(2,000,000)
Net cash provided by (used in) financing activities	10,000,000	194,000,000	192,000,000
Increase (decrease) in cash and cash equivalents	(19,000,000)	(60,000,000)	58,000,000
Cash and cash equivalents, beginning of period	27,000,000	87,000,000	29,000,000
Cash and cash equivalents, end of period	8,000,000	27,000,000	87,000,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	196,000,000	187,000,000	162,000,000
Income tax payments, net of refunds	(4,000,000)	84,000,000	(242,000,000)
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Nuclear facility plant reclassified to regulatory asset, net of depreciation and amortization	0	512,000,000	0
Accrued capital expenditures	217,000,000	182,000,000	153,000,000
Dividends declared but not paid	0	0	1,000,000
Increase in capital lease obligations for investment in property, plant and equipment	60,000,000	0	0
Southern California Gas Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	333,000,000	365,000,000	290,000,000
Adjustments to reconcile net income to net cash provided by operating activities:
Utility depreciation and amortization	431,000,000	383,000,000	362,000,000
Deferred income taxes and investment tax credits	130,000,000	117,000,000	128,000,000
Other adjustments to reconcile net income to net cash provided by operating activities	(7,000,000)	(5,000,000)	(12,000,000)
Net change in other working capital components [Abstract]
Net change in accounts and notes receivable	30,000,000	(113,000,000)	37,000,000
Net change in due to/from affiliates, net	(1,000,000)	(57,000,000)	51,000,000
Net change in income taxes, net	17,000,000	51,000,000	(83,000,000)
Net change in inventories	(113,000,000)	82,000,000	(1,000,000)
Net change in other current assets	(3,000,000)	3,000,000	(6,000,000)
Net change in regulatory balancing accounts	(109,000,000)	(58,000,000)	31,000,000
Net change in accounts payable	156,000,000	(54,000,000)	54,000,000
Net change in customer deposits	0	(1,000,000)	1,000,000
Net change in other current liabilities	3,000,000	24,000,000	(24,000,000)
Net change in other working capital components	(20,000,000)	(123,000,000)	60,000,000
Changes in other assets	(131,000,000)	(52,000,000)	14,000,000
Changes in other liabilities	29,000,000	(4,000,000)	4,000,000
Net cash provided by (used in) operating activities	765,000,000	681,000,000	846,000,000
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(1,104,000,000)	(762,000,000)	(639,000,000)
Decrease (increase) in notes receivable to unconsolidated affiliates, net	0	34,000,000	(4,000,000)
Net cash provided by (used in) investing activities	(1,104,000,000)	(728,000,000)	(643,000,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(100,000,000)	(50,000,000)	(250,000,000)
Preferred dividends paid	(1,000,000)	(1,000,000)	(1,000,000)
Issuances of long-term debt	747,000,000	0	348,000,000
Payments on long-term debt	(250,000,000)	0	(250,000,000)
Increase (decrease) in short-term debt, net	8,000,000	42,000,000	0
Debt issuance costs	(7,000,000)	0	(3,000,000)
Net cash provided by (used in) financing activities	397,000,000	(9,000,000)	(156,000,000)
Increase (decrease) in cash and cash equivalents	58,000,000	(56,000,000)	47,000,000
Cash and cash equivalents, beginning of period	27,000,000	83,000,000	36,000,000
Cash and cash equivalents, end of period	85,000,000	27,000,000	83,000,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	62,000,000	65,000,000	62,000,000
Income tax payments, net of refunds	(10,000,000)	(52,000,000)	16,000,000
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	$ 168,000,000	$ 130,000,000	$ 115,000,000

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Capital expenditures recoverable by U S Treasury grants receivable.

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Financing of build to suit property.

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Loss from plant closure.

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Nuclear facility plant reclassified to regulatory asset, net of depreciation and amortization.

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The cash inflow for the sales of nuclear decommissioning and other trust assets.

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Redemptions of preferred stock of subsidiary.

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Utility loss from plant closure, pretax.

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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The fair value of assets acquired in noncash investing or financing activities.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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This element represents the undistributed income (or loss) of equity method investments, net of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations; such investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The increase (decrease) during the reporting period in receivables to be collected from an entity that is controlling, under the control of, or within the same control group as the reporting entity by means of direct or indirect ownership.

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The increase (decrease) during the reporting period of the sum of amounts due within one year (or one business cycle) from customers for the credit sale of goods and services; and from note holders for outstanding loans.

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The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.

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The increase (decrease) during the reporting period in the asset created by the regulatory convention in which costs and revenues associated with certain utility expenses (such as fuel) are accumulated but on which no return is earned.

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The increase (decrease) during the period in the amount of customer money held in customer accounts, including security deposits, collateral for a current or future transactions, initial payment of the cost of acquisition or for the right to enter into a contract or agreement.

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The increase (decrease) during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity.

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The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

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The increase (decrease) during the reporting period in other noncurrent operating assets not separately disclosed in the statement of cash flows.

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No definition available.

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The increase (decrease) during the reporting period in other noncurrent operating liabilities not separately disclosed in the statement of cash flows.

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No definition available.

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The increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets.

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The increase (decrease) during the reporting period in other liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current liabilities, other noncurrent liabilities, or a combination of other current and noncurrent liabilities.

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The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined.

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Amount of cash outflow associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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No definition available.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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The fair value of liabilities assumed in noncash investing or financing activities.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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The cash outflow to reacquire common stock during the period.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity.

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The cash outflow associated with the purchase of noncontrolling interest during the period.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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The cash outflow associated with extending a long-term loan to a related party. Alternate caption: Payments for Advances to Affiliates.

+ References

No definition available.

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The cash outflow for the purchase of investments that will be held in a decommissioning trust fund.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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The cash inflow from the sale of assets held in a decommissioning trust fund.

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Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.

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No definition available.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow or outflow associated with long-term loans for related parties where one party can exercise control or significant influence over another party, including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from (Payments for) Advances to Affiliates.

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash inflow from a borrowing net of the cash outflow from repayment of a borrowing having initial term of repayment within three months.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Amount of operating expense for depreciation and amortization of regulated operation.

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-Subparagraph (SX 210.5-03.2(b))

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