CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ 751	$ 3,673
Less: Income from discontinued operations, net of income tax	0	(1,850)
(Loss) income from continuing operations, net of income tax	751	1,823
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,376	1,242
Deferred income taxes and investment tax credits	(159)	(12)
Equity earnings	(1,022)	(822)
Foreign currency transaction losses, net	10	95
Share-based compensation expense	48	57
Fixed-price contracts and other derivatives	338	25
Other	70	107
Reserve for Aliso Canyon costs	1,525	259
Net change in other working capital components	(186)	(396)
Distributions from investments	727	429
Insurance receivable for Aliso Canyon costs	31	(165)
Changes in other noncurrent assets and liabilities, net	(528)	38
Net cash provided by continuing operations	2,981	2,680
Net cash used in discontinued operations	0	(1,051)
Net cash provided by operating activities	2,981	1,629
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(3,606)	(3,313)
Expenditures for investments and acquisitions	(216)	(229)
Proceeds from sale of assets	0	22
Distributions from investments	365	761
Purchases of nuclear decommissioning trust assets	(729)	(1,091)
Proceeds from sales of nuclear decommissioning trust assets	729	1,091
Advances to unconsolidated affiliates	(8)	(32)
Repayments of advances to unconsolidated affiliates	0	7
Other	9	13
Net cash used in continuing operations	(3,456)	(2,771)
Net cash provided by discontinued operations	0	5,186
Net cash (used in) provided by investing activities	(3,456)	2,415
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(981)	(872)
Preferred dividends paid	(77)	(107)
Issuances of preferred stock	0	890
Issuances of common stock	5	10
Repurchases of common stock	(39)	(565)
Issuances of debt (maturities greater than 90 days)	1,992	5,934
Payments on debt (maturities greater than 90 days) and finance leases	(2,315)	(4,387)
Increase (decrease) in short-term, debt, net	1,999	(1,871)
Advances from unconsolidated affiliates	40	64
Proceeds from sales of noncontrolling interests	7	0
Purchases of noncontrolling interests	(221)	(178)
Other	(13)	(29)
Net cash provided by (used in) continuing operations	397	(1,111)
Net cash provided by discontinued operations	0	401
Net cash provided by (used in) financing activities	397	(710)
Effect of exchange rate changes in continuing operations	0	(2)
Effect of exchange rate changes in discontinued operations	0	(3)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	0	(5)
(Decrease) increase in cash, cash equivalents and restricted cash, including discontinued operations	(78)	3,329
Cash, cash equivalents and restricted cash, including discontinued operations, January 1	985	217
Cash, cash equivalents and restricted cash, including discontinued operations, September 30	907	3,546
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	741	781
Income tax payments, including discontinued operations, net of refunds	101	1,376
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Increase in Cameron LNG JV investment for guarantee	22	0
Accrued capital expenditures	572	460
Increase in ARO for investment in PP&E	33	0
Increase in finance lease obligations for investment in PP&E	35	72
Derecognized PP&E for net investment in sales-type lease	44	0
Issuance of common stock in exchange for NCI and related AOCI	1,373	0
Contribution to Cameron LNG JV	0	50
Distribution from Cameron LNG JV	0	50
Distribution from Oncor Holdings	8	0
Equitization of long-term debt for deficit held by NCI	0	22
Conversion of mandatory convertible preferred stock	2,258	0
Common dividends issued in stock	0	23
Preferred stock [Member]
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Dividends declared but not paid	22	50
Common Stock [Member]
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Dividends declared but not paid	351	301
San Diego Gas and Electric Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	603	633
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	659	598
Deferred income taxes and investment tax credits	133	36
Other	(1)	13
Net change in other working capital components	(187)	(184)
Changes in other noncurrent assets and liabilities, net	(183)	(113)
Net cash provided by operating activities	1,024	983
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(1,560)	(1,323)
Purchases of nuclear decommissioning trust assets	(729)	(1,091)
Proceeds from sales of nuclear decommissioning trust assets	729	1,091
Other	7	8
Net cash (used in) provided by investing activities	(1,553)	(1,315)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	0	(200)
Issuances of debt (maturities greater than 90 days)	1,120	1,598
Payments on debt (maturities greater than 90 days) and finance leases	(606)	(252)
Increase (decrease) in short-term, debt, net	0	(80)
Debt issuance costs	(8)	(11)
Net cash provided by (used in) financing activities	506	1,055
(Decrease) increase in cash, cash equivalents and restricted cash, including discontinued operations	(23)	723
Cash, cash equivalents and restricted cash, including discontinued operations, January 1	262	10
Cash, cash equivalents and restricted cash, including discontinued operations, September 30	239	733
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	275	276
Income tax payments, including discontinued operations, net of refunds	64	20
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	217	184
Increase in ARO for investment in PP&E	18	0
Increase in finance lease obligations for investment in PP&E	23	26
Southern California Gas Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	(624)	426
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	533	486
Deferred income taxes and investment tax credits	(467)	(38)
Other	47	42
Reserve for Aliso Canyon costs	1,525	259
Net change in other working capital components	385	254
Insurance receivable for Aliso Canyon costs	31	(165)
Changes in other noncurrent assets and liabilities, net	(393)	124
Net cash provided by operating activities	1,037	1,388
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(1,417)	(1,345)
Net cash (used in) provided by investing activities	(1,417)	(1,345)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(75)	(50)
Preferred dividends paid	(1)	(1)
Equity contribution from Sempra Energy	800	0
Issuances of debt (maturities greater than 90 days)	0	949
Payments on finance leases	(9)	(9)
Increase (decrease) in short-term, debt, net	(113)	(630)
Debt issuance costs	0	(8)
Net cash provided by (used in) financing activities	602	251
(Decrease) increase in cash, cash equivalents and restricted cash, including discontinued operations	222	294
Cash, cash equivalents and restricted cash, including discontinued operations, January 1	4	10
Cash, cash equivalents and restricted cash, including discontinued operations, September 30	226	304
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	119	114
Income tax payments, including discontinued operations, net of refunds	170	1
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	205	146
Increase in finance lease obligations for investment in PP&E	12	46
Dividends declared but not paid	$ 0	$ 50