CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended		9 Months Ended		21 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 909	$ 334	$ 1,862	$ 162
Less: Income from discontinued operations, net of income tax	(256)	(54)	(292)	(137)
Income from continuing operations, net of income tax	653	280	1,570	25
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	402	366	1,174	1,115
Deferred income taxes and investment tax credits			12	(328)
Impairment losses	43	4	43	1,304
Gain on sale of assets	3	0	(63)	0
Equity earnings			(485)	(49)
Share-based compensation expense			56	50
Fixed-price contracts and other derivatives			(12)	(44)
Other			16	36
Intercompany activities with discontinued operations, net			184	72
Net change in other working capital components			(200)	491
Insurance receivable for Aliso Canyon costs			107	(56)
Wildfire fund, current and noncurrent			(323)	0
Changes in other noncurrent assets and liabilities, net			(250)	(177)
Net cash provided by continuing operations			1,829	2,439
Net cash provided by discontinued operations			289	220
Net cash provided by operating activities			2,118	2,659
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment			(2,590)	(2,654)
Expenditures for investments and acquisition			(1,449)	(9,921)
Proceeds from sale of assets			899	1
Decrease in cash from deconsolidation of Otay Mesa VIE			(8)	0
Purchases of nuclear decommissioning trust assets			(728)	(703)
Proceeds from sales of nuclear decommissioning trust assets			728	703
Advances to unconsolidated affiliates			(16)	(81)
Repayments of advances to unconsolidated affiliates			12	4
Intercompany activities with discontinued operations, net			(257)	(18)
Other			33	38
Net cash used in continuing operations			(3,376)	(12,631)
Net cash used in discontinued operations			(63)	(161)
Net cash used in investing activities			(3,439)	(12,792)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid			(734)	(645)
Preferred dividends paid			(107)	(53)
Issuances of mandatory convertible preferred stock, net			0	2,259
Issuances of common stock, net			757	2,261
Repurchases of common stock			(23)	(20)
Issuances of debt (maturities greater than 90 days)			3,269	8,458
Payments on debt (maturities greater than 90 days) and finance leases			(2,500)	(2,836)
Increase (decrease) in short-term debt, net			888	715
Proceeds from sale of noncontrolling interests, net			5	90
Purchases of noncontrolling interests			(30)	0
Contributions from (distributions to) noncontrolling interests, net			171	(88)
Intercompany activities with discontinued operations, net			(128)	70
Other			(42)	(112)
Net cash provided by continuing operations			1,526	10,099
Net cash provided by (used in) discontinued operations			49	(34)
Net cash provided by financing activities			1,575	10,065
Effect of exchange rate changes in continuing operations			0	0
Effect of exchange rate changes in discontinued operations			(3)	(8)
Effect of exchange rate changes on cash, cash equivalents and restricted cash			(3)	(8)
Increase (decrease) in cash, cash equivalents and restricted cash, including discontinued operations			251	(76)
Cash, cash equivalents and restricted cash, including discontinued operations, January 1			246	364	$ 364
Cash, cash equivalents and restricted cash, including discontinued operations, September 30	497	288	497	288	497
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized			766	555
Income tax payments, net of refunds			289	69
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Assets acquired			0	9,670
Liabilities assumed			0	(104)
Cash paid			0	9,566
Accrued interest receivable from unconsolidated affiliate	55	45	55	45	55
Accrued capital expenditures			390	396
Increase in finance lease obligations for investment in property, plant and equipment			27	7
Common dividends receivable from discontinued operations	422	0	422	0	422
Common dividends issued in stock	41	41	41	41	41
Preferred stock [Member]
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Dividends declared but not paid	36	36	36	36	36
Common Stock [Member]
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Dividends declared but not paid	272	244	272	244	272
San Diego Gas and Electric Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	266	216	589	531
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	196	174	571	509
Deferred income taxes and investment tax credits			(20)	88
Other			7	(31)
Net change in other working capital components			(60)	150
Wildfire fund, current and noncurrent			(323)	0
Changes in other noncurrent assets and liabilities, net			(10)	(16)
Net cash provided by operating activities			754	1,231
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment			(1,071)	(1,194)
Decrease in cash from deconsolidation of Otay Mesa VIE			(8)	0
Purchases of nuclear decommissioning trust assets			(728)	(703)
Proceeds from sales of nuclear decommissioning trust assets			728	703
Increase in loans to affiliate, net			(25)	0
Other			7	0
Net cash used in investing activities			(1,097)	(1,194)
CASH FLOWS FROM FINANCING ACTIVITIES
Equity contribution from Sempra Energy			322	0
Issuances of debt (maturities greater than 90 days)			400	398
Payments on debt (maturities greater than 90 days) and finance leases			(269)	(204)
Increase (decrease) in short-term debt, net			(291)	(205)
Contributions from (distributions to) noncontrolling interests, net			172	(8)
Debt issuance costs			(4)	(3)
Net cash provided by financing activities			330	(22)
Increase (decrease) in cash, cash equivalents and restricted cash, including discontinued operations			(13)	15
Cash, cash equivalents and restricted cash, including discontinued operations, January 1			37	29	29
Cash, cash equivalents and restricted cash, including discontinued operations, September 30	24	44	24	44	24
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized			285	139
Income tax payments, net of refunds			131	79
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures			117	113
Increase in finance lease obligations for investment in property, plant and equipment			12	0
Dividends declared but not paid	0	250	0	250	0
Southern California Gas Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	143	(14)	438	245
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	154	141	449	414
Deferred income taxes and investment tax credits			(79)	70
Impairment losses	37	0	37	0
Other			(5)	(4)
Net change in other working capital components			194	391
Insurance receivable for Aliso Canyon costs			107	(56)
Changes in other noncurrent assets and liabilities, net			(328)	(178)
Net cash provided by operating activities			813	882
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment			(1,019)	(1,127)
Increase in loans to affiliate, net			0	(88)
Other			1	6
Net cash used in investing activities			(1,018)	(1,209)
CASH FLOWS FROM FINANCING ACTIVITIES
Preferred dividends paid by subsidiary			(1)	(1)
Issuances of debt (maturities greater than 90 days)			349	949
Payments on debt (maturities greater than 90 days) and finance leases			(4)	(500)
Increase (decrease) in short-term debt, net			(148)	(116)
Debt issuance costs			(4)	(9)
Net cash provided by financing activities			192	323
Increase (decrease) in cash, cash equivalents and restricted cash, including discontinued operations			(13)	(4)
Cash, cash equivalents and restricted cash, including discontinued operations, January 1			18	8	8
Cash, cash equivalents and restricted cash, including discontinued operations, September 30	5	4	5	4	5
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized			92	71
Income tax payments, net of refunds			115	(1)
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures			167	178
Increase in finance lease obligations for investment in property, plant and equipment			15	7
Dividends declared but not paid	$ 150	$ 50	$ 150	$ 50	$ 150