CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016		Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 330		$ 458
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	328		303
Deferred income taxes and investment tax credits	112		131
Plant closure (adjustment) loss	0		(21)
Equity earnings	5		(34)
Fixed-price contracts and other derivatives	4		11
Other	2		(27)
Net change in other working capital components	165		19
Insurance Receivable For Aliso Canyon Costs	(335)		0
Changes in other assets	(29)		(42)
Changes in other liabilities	10		13
Net cash provided by operating activities	592		811
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(971)		(780)
Expenditures for investments	(30)		(34)
Distributions from investments	9		1
Purchases of nuclear decommissioning and other trust assets	(94)		(95)
Proceeds from sales by nuclear decommissioning and other trusts	93		94
Decrease in restricted cash	20		25
Increase in restricted cash	(16)		(18)
Advances to unconsolidated affiliates	(6)		(5)
Proceeds From Payments For Long Term Loans For Related Parties	9		33
Other cash flows from investing activities	(3)		9
Net cash used in investing activities	(989)		(770)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(161)		(149)
Proceeds from issuances of common stock	15		17
Repurchases of common stock	(54)		(65)
Issuances of long-term debt	55		938
Payments on long-term debt	(54)		(654)
Increase (decrease) in short-term debt, net	531		(363)
Excess Tax Benefit From Share Based Compensation Financing Activities	34		52
Other cash flows from financing activities	(2)		(7)
Net cash provided by (used in) financing activities	364		(231)
Effect of exchange rate changes on cash and cash equivalents	6		(3)
Increase (decrease) in cash and cash equivalents	(27)		(193)
Cash and cash equivalents, beginning of period	403	[1]	570
Cash and cash equivalents, end of period	376		377
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	97		83
Income tax payments, net of refunds	41		42
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	423		272
Financing of build-to-suit property	0		27
Common dividends issued in stock	13		13
Dividends declared but not paid	197		181
Acquisition Of Business [Abstract]
Assets acquired	0		10
Liabilities Assumed	0		(2)
Accrued purchase price	0		(6)
Cash paid	0		2
San Diego Gas and Electric Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	130		151
Adjustments to reconcile net income to net cash provided by operating activities:
Utility depreciation and amortization	159		145
Deferred income taxes and investment tax credits	20		56
Utility plant closure (adjustment) loss	0		(21)
Fixed-price contracts and other derivatives	(1)		(1)
Other	(9)		(1)
Net change in other working capital components	103		7
Changes in other assets	(34)		(48)
Changes in other liabilities	1		11
Net cash provided by operating activities	369		299
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(329)		(355)
Purchases of nuclear decommissioning trust assets	(93)		(94)
Proceeds from sales by nuclear decommissioning trusts	93		94
Decrease in restricted cash	10		10
Increase in restricted cash	(10)		(10)
Other cash flows from investing activities	(1)		0
Increase (Decrease) in loans to affiliates, net	0		(66)
Net cash used in investing activities	(330)		(421)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	0		388
Payments on long-term debt	(20)		(3)
Increase (decrease) in short-term debt, net	(2)		(246)
Distributions to noncontrolling interests	(1)		(2)
Net cash provided by (used in) financing activities	(23)		137
Increase (decrease) in cash and cash equivalents	16		15
Cash and cash equivalents, beginning of period	20	[1]	8
Cash and cash equivalents, end of period	36		23
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	46		39
Income tax payments, net of refunds	(8)		31
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	104		103
Southern California Gas Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	195		214
Adjustments to reconcile net income to net cash provided by operating activities:
Utility depreciation and amortization	122		113
Deferred income taxes and investment tax credits	59		(9)
Other	(7)		(6)
Net change in other working capital components	243		85
Insurance Receivable For Aliso Canyon Costs	(335)		0
Changes in other assets	(37)		(19)
Changes in other liabilities	1		(3)
Net cash provided by operating activities	241		375
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(340)		(315)
Increase (Decrease) in loans to affiliates, net	50		(74)
Net cash used in investing activities	(290)		(389)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (decrease) in short-term debt, net	5		(50)
Net cash provided by (used in) financing activities	5		(50)
Increase (decrease) in cash and cash equivalents	(44)		(64)
Cash and cash equivalents, beginning of period	58	[1]	85
Cash and cash equivalents, end of period	14		21
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	17		17
Income tax payments, net of refunds	3		(3)
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	$ 148		$ 129

[1] Derived from audited financial statements.