CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 2,362	$ 1,126	$ 351
Less: (Income) loss from discontinued operations, net of income tax	(363)	(188)	31
Income from continuing operations, net of income tax	1,999	938	382
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,569	1,491	1,436
Deferred income taxes and investment tax credits	189	(242)	889
Write-off of wildfire regulatory asset	0	0	351
Impairment losses	43	1,122	72
Gain on sale of assets	(63)	(513)	(2)
Equity earnings	(580)	(175)	(72)
Share-based compensation expense	75	83	82
Other	26	112	22
Net change in other working capital components:
Accounts receivable	(91)	(145)	29
Income taxes receivable/payable, net	(166)	88	(78)
Inventories	(22)	32	(42)
Other current assets	(88)	(79)	(6)
Accounts payable	12	96	84
Regulatory balancing accounts	13	263	108
Reserve for Aliso Canyon costs	(144)	56	31
Other current liabilities	(99)	52	(19)
Intercompany activities with discontinued operations, net	378	70	8
Insurance receivable for Aliso Canyon costs	122	(43)	188
Wildfire fund, current and noncurrent	(323)	0	0
Changes in other noncurrent assets and liabilities, net	(152)	14	(124)
Net cash provided by continuing operations	2,698	3,220	3,339
Net cash provided by discontinued operations	390	296	286
Net cash provided by operating activities	3,088	3,516	3,625
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(3,708)	(3,544)	(3,705)
Expenditures for investments and acquisitions, net of cash and cash equivalents acquired	(1,797)	(10,168)	(269)
Proceeds from sale of assets	899	1,580	15
Purchases of nuclear decommissioning trust assets	(914)	(890)	(1,314)
Proceeds from sales of nuclear decommissioning trust assets	914	890	1,314
Increase (decrease) in loans from affiliates, net	(16)	(95)	(505)
Repayments of advances to unconsolidated affiliates	3	3	9
Intercompany activities with discontinued operations, net	8	(22)	(18)
Other	30	41	24
Net cash used in continuing operations	(4,581)	(12,205)	(4,449)
Net cash used in discontinued operations	(12)	(265)	(436)
Net cash used in investing activities	(4,593)	(12,470)	(4,885)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(993)	(877)	(755)
Preferred dividends paid	(142)	(89)	0
Issuances of mandatory convertible preferred stock, net	0	2,258	0
Issuances of common stock, net	1,830	2,272	47
Repurchases of common stock	(26)	(21)	(15)
Issuances of debt (maturities greater than 90 days)	4,296	8,927	4,260
Payments on debt (maturities greater than 90 days) and finance leases	(3,667)	(3,342)	(2,587)
Increase (decrease) in short-term debt, net	656	(84)	(39)
Advances from unconsolidated affiliates	155	0	35
Proceeds from sale of noncontrolling interests, net	5	90	196
Payments To Acquire Noncontrolling Interest	30	7	0
Distributions to noncontrolling interest, net		(26)	(114)
Contributions from noncontrolling interests, net	98
Intercompany activities with discontinued operations, net	(266)	(109)	167
Other	(49)	(117)	(43)
Net cash provided by continuing operations	1,867	8,875	1,152
Net cash (used in) provided by discontinued operations	(392)	(25)	40
Net cash provided by financing activities	1,475	8,850	1,192
Effect of exchange rate changes on cash, cash equivalents and restricted cash	0	(2)	(2)
Effect of exchange rate changes in discontinued operations	1	(12)	9
Effect of exchange rate changes on cash, cash equivalents and restricted cash	1	(14)	7
Decrease in cash, cash equivalents and restricted cash, including discontinued operations	(29)	(118)	(61)
Cash, cash equivalents and restricted cash, including discontinued operations, January 1	246	364	425
Cash, cash equivalents and restricted cash, including discontinued operations, December 31	217	246	364
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	1,051	773	599
Income tax payments (refunds), net	254	107	122
Noncash acquisition of businesses:
Assets acquired, net of cash and cash equivalents acquired	0	9,670	436
Value of equity method investment immediately prior to acquisition	0	0	(28)
Liabilities assumed	0	(102)	(261)
Cash paid, net of cash and cash equivalents acquired	0	(9,568)	(147)
Other Noncash Investing and Financing Items [Abstract]
Accrued interest receivable from unconsolidated affiliate	55	62	22
Accrued capital expenditures	515	425	520
Accrued commercial paper proceeds	67	0	0
Increase in finance lease obligations for investment in property, plant and equipment	38	556	503
Common dividends issued in stock	55	54	53
San Diego Gas and Electric Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	774	676	421
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	760	688	670
Deferred income taxes and investment tax credits	105	39	(10)
Write-off of wildfire regulatory asset	0	0	351
Other	13	(17)	(24)
Net change in other working capital components:
Accounts receivable	(15)	30	(76)
Due to/from affiliates, net	(8)	(2)	(10)
Income taxes receivable/payable, net	126	(23)	(136)
Inventories	4	3	(25)
Other current assets	(19)	(6)	9
Accounts payable	32	(1)	75
Regulatory balancing accounts	(101)	138	56
Other current liabilities	4	4	4
Wildfire fund, current and noncurrent	(323)	0	0
Changes in other noncurrent assets and liabilities, net	(10)	9	(30)
Net cash provided by operating activities	1,090	1,584	1,547
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(1,522)	(1,542)	(1,555)
Decrease in cash from deconsolidation of Otay Mesa VIE	(8)	0	0
Purchases of nuclear decommissioning trust assets	(914)	(890)	(1,314)
Proceeds from sales of nuclear decommissioning trust assets	914	890	1,314
Decrease in loans to affiliate, net	0	0	31
Other	8	0	9
Net cash used in investing activities	(1,522)	(1,542)	(1,515)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	0	(250)	(450)
Equity contribution from Sempra Energy	322	0	0
Issuances of debt (maturities greater than 90 days)	400	618	398
Payments on debt (maturities greater than 90 days) and finance leases	(274)	(492)	(186)
Increase (decrease) in short-term debt, net	(211)	38	253
Distributions to noncontrolling interest, net			(34)
Contributions from noncontrolling interests, net	172	57
Debt issuance costs	(4)	(5)	(4)
Net cash provided by financing activities	405	(34)	(23)
Decrease in cash, cash equivalents and restricted cash, including discontinued operations	(27)	8	9
Cash, cash equivalents and restricted cash, January 1	37	29	20
Cash, cash equivalents and restricted cash, December 31	10	37	29
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	405	214	195
Income tax payments (refunds), net	191	112	27
Other Noncash Investing and Financing Items [Abstract]
Accrued capital expenditures	174	159	217
Increase in finance lease obligations for investment in property, plant and equipment	16	550	500
Southern California Gas Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	642	401	397
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	602	556	515
Deferred income taxes and investment tax credits	88	78	137
Impairment losses	37	0	0
Other	(5)	(7)	11
Net change in other working capital components:
Accounts receivable	(73)	(87)	72
Due to/from affiliates, net	(1)	(10)	7
Income taxes receivable/payable, net	(156)	14	(5)
Inventories	1	(2)	(66)
Other current assets	(9)	11	0
Accounts payable	(7)	71	39
Regulatory balancing accounts	114	125	53
Reserve for Aliso Canyon costs	(144)	56	31
Other current liabilities	(21)	(6)	20
Insurance receivable for Aliso Canyon costs	122	(43)	188
Changes in other noncurrent assets and liabilities, net	(322)	(144)	(93)
Net cash provided by operating activities	868	1,013	1,306
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(1,439)	(1,538)	(1,367)
Other	1	7	4
Net cash used in investing activities	(1,438)	(1,531)	(1,363)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(150)	(50)	0
Preferred dividends paid	(1)	(1)	(1)
Issuances of debt (maturities greater than 90 days)	349	949	0
Payments on debt (maturities greater than 90 days) and finance leases	(6)	(500)	0
Increase (decrease) in short-term debt, net	374	140	54
Debt issuance costs	(4)	(10)	0
Net cash provided by financing activities	562	528	53
Decrease in cash, cash equivalents and restricted cash, including discontinued operations	(8)	10	(4)
Cash, cash equivalents and restricted cash, January 1	18	8	12
Cash, cash equivalents and restricted cash, December 31	10	18	8
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	126	105	97
Income tax payments (refunds), net	188	0	28
Other Noncash Investing and Financing Items [Abstract]
Accrued capital expenditures	205	191	208
Increase in finance lease obligations for investment in property, plant and equipment	22	6	3
Preferred Stock [Member]
Other Noncash Investing and Financing Items [Abstract]
Dividends declared but not paid	36	36	0
Common Stock [Member]
Other Noncash Investing and Financing Items [Abstract]
Dividends declared but not paid	$ 283	$ 245	$ 207