CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
REVENUES
Utilities operating revenue	$ 2,515	$ 2,190
Energy-related businesses	383	346
Total revenues	2,898	2,536
Operating expenses
Operation and maintenance	(832)	(741)
Depreciation and amortization	(383)	(372)
Franchise fees and other taxes	(130)	(117)
Operating expenses
Other income, net	82	152
Interest income	21	29
Interest expense	(260)	(206)
Income from continuing operations before income taxes and equity earnings (losses) of unconsolidated entities	501	593
Income tax expense	(42)	(242)
Equity earnings (losses)	101	(21)
Income from continuing operations, net of income tax	560	330
(Loss) income from discontinued operations, net of income tax	(42)	28
Net income	518	358
(Earnings) losses attributable to noncontrolling interest	(41)	17
Mandatory convertible preferred stock dividends	(36)	(28)
Earnings attributable to common shares	$ 441	$ 347
Basic earnings (losses) per common share:
Earnings from continuing operations attributable to common shares (in usd per share)	$ 1.79	$ 1.26
(Losses) earnings from discontinued operations attributable to common shares (in usd per share)	(0.19)	0.08
Earnings attributable to common shares (in usd per share)	$ 1.60	$ 1.34
Weighted-average common shares outstanding	274,674	257,932
Earnings Per Share, Diluted [Abstract]
Earnings from continuing operations attributable to common shares (in usd per share)	$ 1.78	$ 1.25
(Losses) earnings from discontinued operations attributable to common shares (in usd per share)	(0.19)	0.08
Earnings from continuing operations attributable to common shares (n usd per share)	$ 1.59	$ 1.33
Weighted-average common share outstanding, diluted	277,228	259,490
Natural gas [Member]
Operating expenses
Operating expenses	$ (531)	$ (348)
Electric fuel and purchased power [Member]
Operating expenses
Operating expenses	(256)	(271)
Energy-related businesses [Member]
Operating expenses
Operating expenses	(108)	(69)
San Diego Gas and Electric Company [Member]
REVENUES
Electric	940	884
Natural gas	205	171
Utilities operating revenue	1,145	1,055
Operating expenses
Cost of electric fuel and purchased power	258	274
Cost of natural gas	79	50
Operation and maintenance	286	248
Depreciation and amortization	186	166
Franchise fees and other taxes	74	69
Total operating expenses	883	807
Operating income	262	248
Other income, net	22	28
Interest income	1	1
Interest expense	(103)	(52)
Income from continuing operations before income taxes and equity earnings (losses) of unconsolidated entities	182	225
Income tax expense	(5)	(56)
Net income	177	169
(Earnings) losses attributable to noncontrolling interest	(1)	1
Earnings attributable to common shares	176	170
Southern California Gas Company [Member]
REVENUES
Utilities operating revenue	1,361	1,126
Operating expenses
Cost of natural gas	455	289
Operation and maintenance	410	384
Depreciation and amortization	147	135
Franchise fees and other taxes	48	40
Total operating expenses	1,060	848
Operating income	301	278
Other income, net	16	33
Interest expense	(34)	(27)
Income from continuing operations before income taxes and equity earnings (losses) of unconsolidated entities	283	284
Income tax expense	(19)	(59)
Net income	264	225
Earnings attributable to common shares	$ 264	$ 225