CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 325		$ 754	[1]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	523		478	[1]
Deferred income taxes and investment tax credits	(53)		138	[1]
Remeasurement of equity method investments			(277)	[1]
Equity earnings	262		(47)	[1]
Fixed-price contracts and other derivatives	1		(2)	[1]
Other	1		(23)	[1]
Net change in other working capital components	28		75	[1]
Distributions from RBS Sempra Commodities LLP, operating activities			53	[1]
Changes in other assets	13		2	[1]
Changes in other liabilities	52		(12)	[1]
Net cash provided by operating activities	1,152		1,139	[1]
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(1,517)		(1,225)	[1]
Expenditures for investments	(303)		(682)	[1]
Proceeds from sale of joint venture	9
Distributions from RBS Sempra Commodities LLP, investing activities			276	[1]
Distributions from investments	31		29	[1]
Purchases of nuclear decommissioning and other trust assets	(327)		(97)	[1]
Proceeds from sales by nuclear decommissioning and other trusts	329		94	[1]
Decrease in restricted cash	68		388	[1]
Increase in restricted cash	(61)		(420)	[1]
Other cash flows from investing activities	(10)		(16)	[1]
Net cash used in investing activities	(1,781)		(1,653)	[1]
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(260)		(210)	[1]
Preferred dividends paid by subsidiaries	(3)		(5)	[1]
Issuances of common stock	45		20	[1]
Repurchases of common stock	(16)		(18)	[1]
Redemption of subsidiary preferred stock			(80)	[1]
Issuances of debt (maturities greater than 90 days)	1,167		870	[1]
Payments on debt (maturities greater than 90 days)	(559)		(270)	[1]
Increase (decrease) in short-term debt, net	241		(319)	[1]
Other cash flows from financing activities	(21)		10	[1]
Net cash provided by (used in) financing activities	594		(2)	[1]
Effect of exchange rate changes on cash and cash equivalents	4		(4)	[1]
Increase (decrease) in cash and cash equivalents	(31)		(520)	[1]
Cash and cash equivalents, beginning of period	252	[1],[2]	912	[1]
Cash and cash equivalents, end of period	221		392	[1]
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	209		211
Income tax payments, net of refunds	93		75
Acquisition Of Business [Abstract]
Assets acquired	29		2,815
Cash paid, net of cash acquired	(19)		(611)
Fair of equity method investments immediately prior to the acquisition			(882)
Fair value of noncontrolling interests			(279)
Additional consideration accrued			(32)
Liabilities Assumed	10		1,011
Accrued capital expenditures	354		273
Dividends declared but not paid	149		119
San Diego Gas and Electric Company and Subsidiary [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	213		147
Adjustments to reconcile net income to net cash provided by operating activities:
Utility depreciation and amortization	231		208
Deferred income taxes and investment tax credits	308		167
Fixed-price contracts and other derivatives	(6)		(6)
Other	(51)		(20)
Net change in other working capital components	(438)		52
Changes in other assets	14		15
Changes in other liabilities	38		(7)
Net cash provided by operating activities	309		556
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(729)		(714)
Purchases of nuclear decommissioning and other trust assets	(325)		(95)
Proceeds from sales by nuclear decommissioning and other trusts	320		90
Decrease in restricted cash	61		257
Increase in restricted cash	(48)		(329)
Net cash used in investing activities	(721)		(791)
CASH FLOWS FROM FINANCING ACTIVITIES
Capital contribution			200
Preferred dividends paid	(2)		(2)
Issuances of long-term debt	249
Payments on long-term debt	(5)		(5)
Increase (decrease) in short-term debt, net	173
Other cash flows from financing activities	(3)
Net cash provided by (used in) financing activities	412		193
Increase (decrease) in cash and cash equivalents			(42)
Cash and cash equivalents, beginning of period	29	[2]	127
Cash and cash equivalents, end of period	29		85
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	69		64
Income tax payments, net of refunds	(26)		29
Acquisition Of Business [Abstract]
Accrued capital expenditures	108		131
Dividends declared but not paid	1		1
Southern California Gas Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	120		128
Adjustments to reconcile net income to net cash provided by operating activities:
Utility depreciation and amortization	177		163
Deferred income taxes and investment tax credits	26		62
Other	(4)		(3)
Net change in other working capital components	385		74
Changes in other assets	1		16
Changes in other liabilities	7		(4)
Net cash provided by operating activities	712		436
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(316)		(325)
Increase (decrease) in loans to affiliates, net	(270)		(211)
Net cash used in investing activities	(586)		(536)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(150)		(50)
Preferred dividends paid	(1)		(1)
Payments on long-term debt			(250)
Net cash provided by (used in) financing activities	(151)		(301)
Increase (decrease) in cash and cash equivalents	(25)		(401)
Cash and cash equivalents, beginning of period	36	[2]	417
Cash and cash equivalents, end of period	11		16
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	31		34
Income tax payments, net of refunds	46		6
Acquisition Of Business [Abstract]
Accrued capital expenditures	$ 67		$ 78

[1] As adjusted for the retrospective effect of a change in accounting principle as we discuss in Note 1.

[2] Derived from audited financial statements.