CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 USD ($)		Mar. 31, 2012 USD ($)	Mar. 31, 2013 San Diego Gas and Electric Company and Subsidiary [Member] USD ($)		Mar. 31, 2012 San Diego Gas and Electric Company and Subsidiary [Member] USD ($)	Mar. 31, 2013 Southern California Gas Company [Member] USD ($)		Mar. 31, 2012 Southern California Gas Company [Member] USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 178		$ 251	$ 81		$ 112	$ 46		$ 66
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	295		257
Utility depreciation and amortization				134		112	100		87
Gains on sale of assets	(74)
Deferred income taxes and investment tax credits	252		31	36		152	18		14
Equity earnings	(14)		(23)
Fixed-price contracts and other derivatives	17		(12)	(2)		(3)
Other	6		14	5		(27)			(1)
Net change in other working capital components	149		168	(2)		(85)	250		280
Changes in other assets	17		12	4		8	3		3
Changes in other liabilities	9		1	8		(3)	(6)
Net cash provided by operating activities	835		699	264		266	411		449
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(531)		(811)	(237)		(398)	(179)		(165)
Expenditures for investments	(5)		(51)
Proceeds from sale of assets	371
Distributions from investments	15		8
Purchases of nuclear decommissioning and other trust assets	(136)		(134)	(135)		(133)
Proceeds from sales by nuclear decommissioning and other trusts	134		135	134		131
Increase (decrease) in loans to affiliates, net							(243)		(200)
Decrease in restricted cash	52		39	17		37
Increase in restricted cash	(60)		(40)	(19)		(36)
Other cash flows from investing activities	(2)		(5)
Net cash used in investing activities	(162)		(859)	(240)		(399)	(422)		(365)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(145)		(115)						(50)
Preferred dividends paid				(1)		(1)
Preferred dividends paid by subsidiaries	(2)		(2)
Proceeds from issuances of common stock	15		13
Repurchases of common stock	(45)		(16)
Issuances of debt (maturities greater than 90 days)	608		1,008
Issuances of long-term debt						249
Payments on debt (maturities greater than 90 days)	(645)		(347)
Payments on long-term debt				(3)		(3)
Proceeds from sale of noncontrolling interests, net of $25 million in offering costs	574
Increase (decrease) in short-term debt, net	(43)		(224)
Distributions to noncontrolling interests	(1)		(3)	(1)
Other cash flows from financing activities	4		(4)			(2)
Net cash provided by (used in) financing activities	320		310	(5)		243			(50)
Effect of exchange rate changes on cash and cash equivalents	3		2
Increase (decrease) in cash and cash equivalents	996		152	19		110	(11)		34
Cash and cash equivalents, beginning of period	475	[1]	252	87	[1]	29	83	[1]	36
Cash and cash equivalents, end of period	1,471		404	106		139	72		70
Sale of noncontrolling interests offering costs	25
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	87		62	28		17	12		5
Income tax payments, net of refunds	14		38			62			17
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING ACTIVITIES
Accrued capital expenditures	275		336	102		134	76		64
U. S. Treasury grants receivable	(22)		17
SUPPLEMENTAL DISCLOSURE OF NONCASH FINANCING ACTIVITIES
Dividends declared but not paid	$ 160		$ 151	$ 1		$ 1

[1] Derived from audited financial statements.