CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015		Sep. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,060		$ 941
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	925		866
Deferred income taxes and investment tax credits	179		131
Gain on sale of equity interest and assets	(62)		(48)
Plant closure (adjustment) loss	(21)		(13)
Equity earnings	(143)		(84)
Fixed-price contracts and other derivatives	(20)		(19)
Other	28		32
Net change in other working capital components	260		(215)
Changes in other assets	(112)		28
Changes in other liabilities	(5)		42
Net cash provided by operating activities	2,089		1,661
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(2,227)		(2,320)
Expenditures for investments	(183)		(192)
Proceeds from sale of equity interest and assets, net of cash sold	347		92
Distributions from investments	14		15
Purchases of nuclear decommissioning and other trust assets	(407)		(505)
Proceeds from sales by nuclear decommissioning and other trusts	431		498
Decrease in restricted cash	68		156
Increase in restricted cash	(81)		(139)
Advances to unconsolidated affiliates	(24)		(100)
Proceeds From Payments For Long Term Loans For Related Parties	74		19
Other cash flows from investing activities	9		10
Net cash used in investing activities	(1,979)		(2,466)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(468)		(450)
Preferred dividends paid by subsidiaries	(1)		(1)
Proceeds from issuances of common stock	41		43
Repurchases of common stock	(74)		(38)
Issuances of long-term debt	2,058		3,063
Payments on long-term debt	(1,316)		(1,845)
Increase (decrease) in short-term debt, net	(201)		(111)
Distributions to noncontrolling interests	(57)		(84)
Other cash flows from financing activities	47		(5)
Net cash provided by (used in) financing activities	29		572
Effect of exchange rate changes on cash and cash equivalents	(12)		(4)
Increase (decrease) in cash and cash equivalents	127		(237)
Cash and cash equivalents, beginning of period	570	[1]	904
Cash and cash equivalents, end of period	697		667
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	355		359
Income tax payments, net of refunds	37		154
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	459		385
Redemption of industrial development bonds	79		0
Increase in capital lease obligations for investments in property, plant and equipment	0		60
Dividends declared but not paid	179		166
Financing of build-to-suit property	61		49
Common dividends issued in stock	41		28
Acquisition Of Business [Abstract]
Assets acquired	10		0
Accrued purchase price	(5)		0
Liabilities Assumed	(2)		0
Cash paid	3		0
San Diego Gas and Electric Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	463		399
Adjustments to reconcile net income to net cash provided by operating activities:
Utility depreciation and amortization	446		395
Deferred income taxes and investment tax credits	170		193
Utility plant closure (adjustment) loss	(21)		(13)
Fixed-price contracts and other derivatives	(3)		(5)
Other	(14)		(30)
Net change in other working capital components	136		(252)
Changes in other assets	(93)		106
Changes in other liabilities	10		28
Net cash provided by operating activities	1,094		821
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(835)		(790)
Purchases of nuclear decommissioning trust assets	(404)		(501)
Proceeds from sales by nuclear decommissioning trusts	431		498
Decrease in restricted cash	27		109
Increase in restricted cash	(29)		(96)
Other cash flows from investing activities	0		(16)
Net cash used in investing activities	(810)		(796)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(150)		0
Issuances of long-term debt	388		100
Payments on long-term debt	(294)		(22)
Increase (decrease) in short-term debt, net	(202)		(59)
Distributions to noncontrolling interests	(14)		(38)
Net cash provided by (used in) financing activities	(272)		(19)
Increase (decrease) in cash and cash equivalents	12		6
Cash and cash equivalents, beginning of period	8	[1]	27
Cash and cash equivalents, end of period	20		33
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	141		136
Income tax payments, net of refunds	62		(4)
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	142		118
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	277		257
Adjustments to reconcile net income to net cash provided by operating activities:
Utility depreciation and amortization	342		321
Deferred income taxes and investment tax credits	98		94
Other	(18)		(2)
Net change in other working capital components	48		(19)
Changes in other assets	(57)		(70)
Changes in other liabilities	0		15
Net cash provided by operating activities	690		596
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(946)		(764)
Increase in loans to affiliates, net	(250)		(281)
Net cash used in investing activities	(1,196)		(1,045)
CASH FLOWS FROM FINANCING ACTIVITIES
Preferred dividends paid	(1)		(1)
Issuances of long-term debt	599		747
Payments on long-term debt	0		(250)
Increase (decrease) in short-term debt, net	(50)		(42)
Other cash flows from financing activities	(4)		(7)
Net cash provided by (used in) financing activities	544		447
Increase (decrease) in cash and cash equivalents	38		(2)
Cash and cash equivalents, beginning of period	85	[1]	27
Cash and cash equivalents, end of period	123		25
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	53		43
Income tax payments, net of refunds	11		19
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	172		137
Dividends declared but not paid	$ 50		$ 0

[1] Derived from audited financial statements.