CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 518,000,000	$ 358,000,000
Loss (income) from discontinued operations, net of income tax	42,000,000	(28,000,000)
Income from continuing operations, net of income tax	560,000,000	330,000,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	383,000,000	372,000,000
Deferred income taxes and investment tax credits	24,000,000	202,000,000
Equity (earnings) losses	(101,000,000)	21,000,000
Share-based compensation expense	21,000,000	15,000,000
Fixed-price contracts and other derivatives	(27,000,000)	(35,000,000)
Other	13,000,000	7,000,000
Intercompany activities with discontinued operations, net	31,000,000	0
Net change in other working capital components	169,000,000	101,000,000
Insurance receivable for Aliso Canyon costs	(16,000,000)	(29,000,000)
Changes in other noncurrent assets and liabilities, net	(199,000,000)	(94,000,000)
Net cash provided by continuing operations	858,000,000	890,000,000
Net cash provided by discontinued operations	93,000,000	76,000,000
Net cash provided by operating activities	951,000,000	966,000,000
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(783,000,000)	(979,000,000)
Expenditures for investments and acquisitions, net of cash and cash equivalents acquired	(94,000,000)	(9,617,000,000)
Proceeds from sale of assets	327,000,000	0
Purchases of nuclear decommissioning trust assets	(225,000,000)	(210,000,000)
Proceeds from sales by nuclear decommissioning trusts	225,000,000	210,000,000
Advances to unconsolidated affiliates	0	(81,000,000)
Repayments of advances to unconsolidated affiliates	3,000,000	1,000,000
Intercompany activities with discontinued operations, net	0	(3,000,000)
Other	7,000,000	35,000,000
Net cash used in continuing operations	(540,000,000)	(10,644,000,000)
Net cash used in discontinued operations	(70,000,000)	(58,000,000)
Net cash used in investing activities	(610,000,000)	(10,702,000,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Common dividends paid	(232,000,000)	(194,000,000)
Preferred dividends paid	(36,000,000)	0
Issuances of mandatory convertible preferred stock, net of $32 in offering costs	0	1,693,000,000
Issuances of common stock, net of $24 in offering costs in 2018	11,000,000	1,278,000,000
Repurchases of common stock	(14,000,000)	(19,000,000)
Issuances of debt (maturities greater than 90 days)	304,000,000	5,949,000,000
Payments on debt (maturities greater than 90 days) and finance leases	(837,000,000)	(154,000,000)
Payments on finance leases	(5,000,000)
Increase (decrease) in short-term debt, net	497,000,000	1,149,000,000
Purchases of and distributions to noncontrolling interests	(27,000,000)	(3,000,000)
Intercompany activities with discontinued operations, net	(2,000,000)	67,000,000
Other	0	(82,000,000)
Net cash (used in) provided by continuing operations	(336,000,000)	9,684,000,000
Net cash used in discontinued operations	(45,000,000)	(6,000,000)
Net cash (used in) provided by financing activities	(381,000,000)	9,678,000,000
Effect of exchange rate changes in continuing operations	0	1,000,000
Effect of exchange rate changes in discontinued operations	1,000,000	0
Effect of exchange rate changes on cash, cash equivalents and restricted cash	1,000,000	1,000,000
Increase (decrease) in cash, cash equivalents and restricted cash, including discontinued operations	(39,000,000)	(57,000,000)
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, March 31	207,000,000	307,000,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	257,000,000	108,000,000
Income tax payments, net of refunds	16,000,000	18,000,000
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	388,000,000	316,000,000
Accrued Merger-related transaction and financing costs	0	6,000,000
Increase in finance lease obligations for investment in property, plant and equipment	7,000,000	5,000,000
Common dividends issued in stock	13,000,000	13,000,000
Preferred stock [Member]
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Dividends declared but not paid	36,000,000	28,000,000
Common Stock [Member]
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Dividends declared but not paid	265,000,000	236,000,000
San Diego Gas and Electric Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	177,000,000	169,000,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	186,000,000	166,000,000
Deferred income taxes and investment tax credits	(28,000,000)	(11,000,000)
Other	1,000,000	3,000,000
Net change in other working capital components	96,000,000	102,000,000
Changes in other noncurrent assets and liabilities, net	11,000,000	(25,000,000)
Net cash provided by operating activities	443,000,000	404,000,000
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(356,000,000)	(475,000,000)
Purchases of nuclear decommissioning trust assets	(225,000,000)	(210,000,000)
Proceeds from sales by nuclear decommissioning trusts	225,000,000	210,000,000
Net cash used in investing activities	(356,000,000)	(475,000,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Payments on debt (maturities greater than 90 days) and finance leases	(22,000,000)	(20,000,000)
Payments on finance leases	(4,000,000)
Increase (decrease) in short-term debt, net	(53,000,000)	87,000,000
Net cash (used in) provided by financing activities	(75,000,000)	67,000,000
Increase (decrease) in cash, cash equivalents and restricted cash, including discontinued operations	12,000,000	(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, March 31	49,000,000	25,000,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	86,000,000	39,000,000
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	100,000,000	97,000,000
Increase in finance lease obligations for investment in property, plant and equipment	4,000,000	0
Southern California Gas Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	264,000,000	225,000,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	147,000,000	135,000,000
Deferred income taxes and investment tax credits	(65,000,000)	47,000,000
Other	5,000,000	21,000,000
Net change in other working capital components	287,000,000	76,000,000
Insurance receivable for Aliso Canyon costs	(16,000,000)	(29,000,000)
Changes in other noncurrent assets and liabilities, net	(246,000,000)	(56,000,000)
Net cash provided by operating activities	376,000,000	419,000,000
CASH FLOWS FROM INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(324,000,000)	(403,000,000)
Other	0	3,000,000
Net cash used in investing activities	(324,000,000)	(400,000,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Payments on finance leases	(1,000,000)	0
Increase (decrease) in short-term debt, net	(66,000,000)	(16,000,000)
Net cash (used in) provided by financing activities	(67,000,000)	(16,000,000)
Increase (decrease) in cash, cash equivalents and restricted cash, including discontinued operations	(15,000,000)	3,000,000
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, March 31	3,000,000	11,000,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Interest payments, net of amounts capitalized	26,000,000	18,000,000
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	163,000,000	159,000,000
Increase in finance lease obligations for investment in property, plant and equipment	$ 3,000,000	$ 5,000,000