CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 953,000,000	$ (172,000,000)
Less: Income from discontinued operations, net of income tax	(36,000,000)	(83,000,000)
Income (loss) from continuing operations, net of income tax	917,000,000	(255,000,000)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	772,000,000	749,000,000
Deferred income taxes and investment tax credits	(12,000,000)	(432,000,000)
Impairment losses	0	1,300,000,000
Gain on sale of assets	(66,000,000)	0
Equity (earnings) losses	(219,000,000)	25,000,000
Share-based compensation expense	39,000,000	33,000,000
Fixed-price contracts and other derivatives	(28,000,000)	(9,000,000)
Other	(4,000,000)	45,000,000
Intercompany activities with discontinued operations, net	64,000,000	42,000,000
Net change in other working capital components	84,000,000	268,000,000
Insurance receivable for Aliso Canyon costs	80,000,000	(84,000,000)
Changes in other noncurrent assets and liabilities, net	(104,000,000)	(157,000,000)
Net cash provided by continuing operations	1,523,000,000	1,525,000,000
Net cash provided by discontinued operations	181,000,000	148,000,000
Net cash provided by operating activities	1,704,000,000	1,673,000,000
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(1,651,000,000)	(1,834,000,000)
Expenditures for investments and acquisition	(1,391,000,000)	(9,823,000,000)
Proceeds from sale of assets	902,000,000	1,000,000
Purchases of nuclear decommissioning trust assets	(497,000,000)	(487,000,000)
Proceeds from sales of nuclear decommissioning trust assets	497,000,000	487,000,000
Advances to unconsolidated affiliates	(16,000,000)	(81,000,000)
Repayments of advances to unconsolidated affiliates	9,000,000	1,000,000
Intercompany activities with discontinued operations, net	(2,000,000)	(8,000,000)
Other	13,000,000	39,000,000
Net cash used in continuing operations	(2,136,000,000)	(11,705,000,000)
Net cash used in discontinued operations	(131,000,000)	(112,000,000)
Net cash used in investing activities	(2,267,000,000)	(11,817,000,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(483,000,000)	(416,000,000)
Preferred dividends paid	(71,000,000)	(28,000,000)
Preferred dividends paid by subsidiary	(1,000,000)	(1,000,000)
Issuances of mandatory convertible preferred stock, net of $32 in offering costs	0	1,693,000,000
Issuances of common stock, net of $38 in offering costs in 2018	20,000,000	2,090,000,000
Repurchases of common stock	(18,000,000)	(20,000,000)
Issuances of debt (maturities greater than 90 days)	2,630,000,000	7,328,000,000
Payments on debt (maturities greater than 90 days) and finance leases	(871,000,000)	(1,799,000,000)
(Decrease) increase in short-term debt, net	(444,000,000)	1,265,000,000
Proceeds from sale of noncontrolling interest, net of offering costs.	0	85,000,000
Purchases of and distributions to noncontrolling interests	(31,000,000)	(9,000,000)
Intercompany activities with discontinued operations, net	0	70,000,000
Other	(37,000,000)	(104,000,000)
Net cash provided by continuing operations	694,000,000	10,154,000,000
Net cash used in discontinued operations	(83,000,000)	(44,000,000)
Net cash provided by financing activities	611,000,000	10,110,000,000
Effect of exchange rate changes in continuing operations	0	0
Effect of exchange rate changes in discontinued operations	0	(3,000,000)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	0	(3,000,000)
Increase (decrease) in cash, cash equivalents and restricted cash, including discontinued operations	48,000,000	(37,000,000)
Cash, cash equivalents and restricted cash, including discontinued operations, January 1	246,000,000	364,000,000
Cash, cash equivalents and restricted cash, including discontinued operations, June 30	294,000,000	327,000,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	514,000,000	332,000,000
Income tax payments, net of refunds	64,000,000	51,000,000
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Assets acquired	0	9,670,000,000
Liabilities assumed	0	(104,000,000)
Cash paid	0	9,566,000,000
Accrued capital expenditures	417,000,000	373,000,000
Increase in finance lease obligations for investment in property, plant and equipment	16,000,000	7,000,000
Common dividends issued in stock	27,000,000	27,000,000
Preferred stock [Member]
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Dividends declared but not paid	36,000,000	25,000,000
Common Stock [Member]
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Dividends declared but not paid	266,000,000	243,000,000
San Diego Gas and Electric Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	323,000,000	315,000,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	375,000,000	335,000,000
Deferred income taxes and investment tax credits	(27,000,000)	47,000,000
Other	(2,000,000)	(27,000,000)
Net change in other working capital components	(68,000,000)	(17,000,000)
Changes in other noncurrent assets and liabilities, net	19,000,000	(9,000,000)
Net cash provided by operating activities	620,000,000	644,000,000
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(708,000,000)	(851,000,000)
Purchases of nuclear decommissioning trust assets	(497,000,000)	(487,000,000)
Proceeds from sales of nuclear decommissioning trust assets	497,000,000	487,000,000
Other	0	6,000,000
Net cash used in investing activities	(708,000,000)	(845,000,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of debt (maturities greater than 90 days)	400,000,000	398,000,000
Payments on debt (maturities greater than 90 days) and finance leases	(36,000,000)	(23,000,000)
(Decrease) increase in short-term debt, net	(273,000,000)	(172,000,000)
Capital distributions made by VIE, net	(2,000,000)	(3,000,000)
Debt issuance costs	(4,000,000)	(3,000,000)
Net cash provided by financing activities	85,000,000	197,000,000
Increase (decrease) in cash, cash equivalents and restricted cash, including discontinued operations	(3,000,000)	(4,000,000)
Cash, cash equivalents and restricted cash, including discontinued operations, January 1	37,000,000	29,000,000
Cash, cash equivalents and restricted cash, including discontinued operations, June 30	34,000,000	25,000,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	201,000,000	100,000,000
Income tax payments, net of refunds	106,000,000	70,000,000
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	110,000,000	105,000,000
Increase in finance lease obligations for investment in property, plant and equipment	7,000,000	0
Southern California Gas Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	295,000,000	259,000,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	295,000,000	273,000,000
Deferred income taxes and investment tax credits	(75,000,000)	81,000,000
Other	13,000,000	0
Net change in other working capital components	217,000,000	326,000,000
Insurance receivable for Aliso Canyon costs	80,000,000	(84,000,000)
Changes in other noncurrent assets and liabilities, net	(151,000,000)	(106,000,000)
Net cash provided by operating activities	674,000,000	749,000,000
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(659,000,000)	(783,000,000)
Increase in loans to affiliate, net	(94,000,000)	0
Other	2,000,000	4,000,000
Net cash used in investing activities	(751,000,000)	(779,000,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Preferred dividends paid by subsidiary	(1,000,000)	(1,000,000)
Issuances of debt (maturities greater than 90 days)	349,000,000	400,000,000
Payments on debt (maturities greater than 90 days) and finance leases	(2,000,000)	(500,000,000)
(Decrease) increase in short-term debt, net	(256,000,000)	210,000,000
Debt issuance costs	(3,000,000)	(4,000,000)
Net cash provided by financing activities	87,000,000	105,000,000
Increase (decrease) in cash, cash equivalents and restricted cash, including discontinued operations	10,000,000	75,000,000
Cash, cash equivalents and restricted cash, including discontinued operations, January 1	18,000,000	8,000,000
Cash, cash equivalents and restricted cash, including discontinued operations, June 30	28,000,000	83,000,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	60,000,000	51,000,000
Income tax payments, net of refunds	87,000,000	(4,000,000)
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	178,000,000	151,000,000
Increase in finance lease obligations for investment in property, plant and equipment	$ 9,000,000	$ 7,000,000