CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013 USD ($)		Sep. 30, 2012 USD ($)	Sep. 30, 2013 San Diego Gas and Electric Company and Subsidiary [Member] USD ($)		Sep. 30, 2012 San Diego Gas and Electric Company and Subsidiary [Member] USD ($)	Sep. 30, 2013 Southern California Gas Company [Member] USD ($)		Sep. 30, 2012 Southern California Gas Company [Member] USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 768		$ 615	$ 293		$ 401	$ 267		$ 191
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	828		803
Utility depreciation and amortization				367		359	280		268
Deferred income taxes and investment tax credits	327		(45)	100		262	72		39
Gains on sale of assets	(113)		(7)
Loss from plant closure	200		0
Utility loss from plant closure				200		0
Equity earnings	(34)		346
Fixed-price contracts and other derivatives	(25)		1	(7)		(9)
Other	23		(1)	(9)		(55)	(6)		(9)
Net change in other working capital components	(454)		(373)	(284)		(518)	(56)		240
Changes in other assets	(203)		202	(164)		201	(65)		4
Changes in other liabilities	13		147	13		129	(5)		13
Net cash provided by operating activities	1,330		1,688	509		770	487		746
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(1,785)		(2,241)	(679)		(998)	(521)		(462)
Expenditures for investments	(21)		(359)
Proceeds from sale of assets and investment	566		9
Proceeds from sale of assets				8		0
Proceeds from U.S. Treasury grants	238		0
Distributions from investments	141		43
Purchases of nuclear decommissioning and other trust assets	(514)		(534)	(511)		(530)
Proceeds from sales by nuclear decommissioning and other trusts	510		534	507		524
Increase (decrease) in loans to affiliates, net							17		(257)
Decrease in restricted cash	285		89	54		74
Increase in restricted cash	(311)		(105)	(52)		(62)
Other cash flows from investing activities	(10)		(12)	(5)		0
Net cash used in investing activities	(901)		(2,576)	(678)		(992)	(504)		(719)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(452)		(405)				(50)		(150)
Preferred dividends paid				(4)		(4)	(1)		(1)
Preferred dividends paid by subsidiaries	(5)		(5)
Proceeds from issuances of common stock	57		50
Repurchases of common stock	(45)		(16)
Issuances of debt (maturities greater than 90 days)	1,404		2,294
Issuances of long-term debt				450		249	0		348
Payments on debt (maturities greater than 90 days)	(1,444)		(563)
Payments on long-term debt				(183)		(7)
Proceeds from sale of noncontrolling interests, net of $25 million in offering costs	574		0
Increase (decrease) in short-term debt, net	81		(142)	0		2
Distributions to noncontrolling interests	(28)		(36)	(12)		(22)
Debt issuances costs							0		(3)
Other cash flows from financing activities	15		(20)	(2)		(3)
Net cash provided by (used in) financing activities	157		1,157	249		215	(51)		194
Effect of exchange rate changes on cash and cash equivalents	0		9
Increase (decrease) in cash and cash equivalents	586		278	80		(7)	(68)		221
Cash and cash equivalents, beginning of period	475	[1]	252	87	[1]	29	83	[1]	36
Cash and cash equivalents, end of period	1,061		530	167		22	15		257
Sale of noncontrolling interests offering costs	25
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	359		278	127		96	44		36
Income tax payments, net of refunds	106		99	33		(121)	66		46
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING ACTIVITIES
Nuclear facility plant reclassified to regulatory asset, net of depreciation and amortization	512		0	512		0
Accrued capital expenditures	285		315	108		87	97		69
Capital expenditures recoverable by U. S. Treasury grants receivable	3		136
Sequestration of U.S. Treasury grants receivable	(23)		0
Acquisition Of Business [Abstract]
Assets acquired	13		29
Cash paid, net of cash acquired	(11)		(19)
Liabilities Assumed	2		10
SUPPLEMENTAL DISCLOSURE OF NONCASH FINANCING ACTIVITIES
Call premium on preferred stock of subsidiary	3		0
Call premium on preferred stock	3		0	3		0
Dividends declared but not paid	$ 158		$ 149	$ 1		$ 1

[1] Derived from audited financial statements.