CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013 USD ($)		Jun. 30, 2012 USD ($)	Jun. 30, 2013 San Diego Gas and Electric Company and Subsidiary [Member] USD ($)		Jun. 30, 2012 San Diego Gas and Electric Company and Subsidiary [Member] USD ($)	Jun. 30, 2013 Southern California Gas Company [Member] USD ($)		Jun. 30, 2012 Southern California Gas Company [Member] USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 445		$ 325	$ 154		$ 213	$ 165		$ 120
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	542		523
Utility depreciation and amortization				241		231	180		177
Deferred income taxes and investment tax credits	251		(53)	34		308	43		26
Gains on sale of assets	(74)		(7)
Loss from plant closure	200
Utility loss from plant closure				200
Equity earnings	(23)		262
Fixed-price contracts and other derivatives	(28)		1	(5)		(6)
Other	1		8	(9)		(51)	(3)		(4)
Net change in other working capital components	20		28	(115)		(438)	257		385
Changes in other assets	(237)		13	(177)		14	(73)		1
Changes in other liabilities	8		52	6		38	(6)		7
Net cash provided by operating activities	1,105		1,152	329		309	563		712
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(1,130)		(1,517)	(446)		(729)	(340)		(316)
Expenditures for investments	(5)		(303)
Proceeds from sale of assets and investment	384		9
Proceeds from U.S. Treasury grants	74
Distributions from investments	95		31
Purchases of nuclear decommissioning and other trust assets	(330)		(327)	(327)		(325)
Proceeds from sales by nuclear decommissioning and other trusts	326		329	326		320
Increase (decrease) in loans to affiliates, net							(235)		(270)
Decrease in restricted cash	143		68	40		61
Increase in restricted cash	(186)		(61)	(38)		(48)
Other cash flows from investing activities	2		(10)
Net cash used in investing activities	(627)		(1,781)	(445)		(721)	(575)		(586)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(299)		(260)				(50)		(150)
Preferred dividends paid				(2)		(2)	(1)		(1)
Preferred dividends paid by subsidiaries	(3)		(3)
Proceeds from issuances of common stock	22		45
Repurchases of common stock	(45)		(16)
Issuances of debt (maturities greater than 90 days)	894		1,167
Issuances of long-term debt						249
Payments on debt (maturities greater than 90 days)	(1,134)		(559)
Payments on long-term debt				(5)		(5)
Proceeds from sale of noncontrolling interests, net of $25 million in offering costs	574
Increase (decrease) in short-term debt, net	(10)		241	53		173
Distributions to noncontrolling interests	(13)		(10)
Other cash flows from financing activities	18		(11)	(4)		(3)
Net cash provided by (used in) financing activities	4		594	42		412	(51)		(151)
Effect of exchange rate changes on cash and cash equivalents	(3)		4
Increase (decrease) in cash and cash equivalents	479		(31)	(74)			(63)		(25)
Cash and cash equivalents, beginning of period	475	[1]	252	87	[1]	29	83	[1]	36
Cash and cash equivalents, end of period	954		221	13		29	20		11
Sale of noncontrolling interests offering costs	25
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	269		209	94		69	32		31
Income tax payments, net of refunds	78		93	19		(26)	58		46
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING ACTIVITIES
Nuclear facility plant reclassified to regulatory asset, net of depreciation and amortization	512			512
Accrued capital expenditures	214		354	68		108	81		67
Capital expenditures recoverable by U. S. Treasury grants receivable	3		42
Sequestration of U.S. Treasury grants receivable	(23)
Acquisition Of Business [Abstract]
Assets acquired			29
Cash paid, net of cash acquired			(19)
Liabilities Assumed			10
SUPPLEMENTAL DISCLOSURE OF NONCASH FINANCING ACTIVITIES
Dividends declared but not paid	$ 158		$ 149	$ 1		$ 1

[1] Derived from audited financial statements.