CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 458		$ 266
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	303		286
Deferred income taxes and investment tax credits	131		95
Gain on sale of equity interest and assets	0		(27)
Plant closure (adjustment) loss	(21)		(13)
Equity earnings	(34)		(23)
Fixed-price contracts and other derivatives	11		(3)
Other	(27)		(24)
Net change in other working capital components	19		234
Changes in other assets	(42)		94
Changes in other liabilities	13		19
Net cash provided by operating activities	811		904
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(780)		(801)
Expenditures for investments	(34)		(12)
Proceeds from sale of equity interest and assets, net of cash sold	0		66
Distributions from investments	1		3
Purchases of nuclear decommissioning and other trust assets	(95)		(198)
Proceeds from sales by nuclear decommissioning and other trusts	94		195
Decrease in restricted cash	25		23
Increase in restricted cash	(18)		(27)
Advances to unconsolidated affiliates	(5)		(17)
Other cash flows from investing activities	9		(2)
Proceeds From Payments For Long Term Loans For Related Parties	33		0
Net cash used in investing activities	(770)		(770)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(149)		(154)
Proceeds from issuances of common stock	17		11
Repurchases of common stock	(65)		(37)
Issuances of long-term debt	938		1,188
Payments on long-term debt	(654)		(1,138)
Increase (decrease) in short-term debt, net	(363)		(69)
Other cash flows from financing activities	45		6
Net cash provided by (used in) financing activities	(231)		(193)
Effect of exchange rate changes on cash and cash equivalents	(3)		(1)
Increase (decrease) in cash and cash equivalents	(193)		(60)
Cash and cash equivalents, beginning of period	570	[1]	904
Cash and cash equivalents, end of period	377		844
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	83		91
Income tax payments, net of refunds	42		41
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	272		249
Increase in capital lease obligations for investments in property, plant and equipment	0		60
Acquisition Of Business [Abstract]
Assets acquired	10		0
Accrued purchase price	(6)		0
Liabilities Assumed	(2)		0
Cash paid	2		0
Dividends declared but not paid	181		168
Financing of build-to-suit property	27		9
San Diego Gas and Electric Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	151		101
Adjustments to reconcile net income to net cash provided by operating activities:
Utility depreciation and amortization	145		130
Deferred income taxes and investment tax credits	56		57
Utility plant closure (adjustment) loss	(21)		(13)
Fixed-price contracts and other derivatives	(1)		(2)
Other	(1)		(9)
Net change in other working capital components	7		(76)
Changes in other assets	(48)		63
Changes in other liabilities	11		10
Net cash provided by operating activities	299		261
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(355)		(294)
Purchases of nuclear decommissioning trust assets	(94)		(198)
Proceeds from sales by nuclear decommissioning trusts	94		195
Decrease in restricted cash	10		10
Increase in restricted cash	(10)		(10)
Increase in loans to affiliates, net	(66)		0
Net cash used in investing activities	(421)		(297)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	388		0
Payments on long-term debt	(3)		(3)
Increase (decrease) in short-term debt, net	(246)		31
Distributions to noncontrolling interests	(2)		(7)
Net cash provided by (used in) financing activities	137		21
Increase (decrease) in cash and cash equivalents	15		(15)
Cash and cash equivalents, beginning of period	8	[1]	27
Cash and cash equivalents, end of period	23		12
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	39		36
Income tax payments, net of refunds	31		0
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	103		99
Increase in capital lease obligations for investments in property, plant and equipment	0		60
Southern California Gas Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	214		78
Adjustments to reconcile net income to net cash provided by operating activities:
Utility depreciation and amortization	113		105
Deferred income taxes and investment tax credits	(9)		26
Other	(6)		0
Net change in other working capital components	85		197
Changes in other assets	(19)		18
Changes in other liabilities	(3)		3
Net cash provided by operating activities	375		427
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(315)		(260)
Advances to unconsolidated affiliates	(74)		(117)
Net cash used in investing activities	(389)		(377)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	0		248
Payments on long-term debt	0		(250)
Increase (decrease) in short-term debt, net	(50)		(42)
Other cash flows from financing activities	0		(1)
Net cash provided by (used in) financing activities	(50)		(45)
Increase (decrease) in cash and cash equivalents	(64)		5
Cash and cash equivalents, beginning of period	85	[1]	27
Cash and cash equivalents, end of period	21		32
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	17		12
Income tax payments, net of refunds	(3)		30
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	$ 129		$ 111

[1] Derived from audited financial statements.