CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
REVENUES
Utilities operating revenue	$ 1,895	$ 1,820	$ 4,410	$ 4,010
Energy-related businesses	335	355	718	701
Total revenues	2,230	2,175	5,128	4,711
Operating expenses
Operation and maintenance	(838)	(742)	(1,670)	(1,483)
Depreciation and amortization	(389)	(377)	(772)	(749)
Franchise fees and other taxes	(112)	(104)	(242)	(221)
Operating expenses
Impairment losses	0	(1,300)	0	(1,300)
Gain on sale of assets	66	0	66	0
Other income (expense), net	28	(56)	110	96
Interest income	21	18	42	47
Interest expense	(258)	(228)	(518)	(434)
Income (loss) from continuing operations before income taxes and equity earnings (losses)	286	(1,183)	787	(590)
Income tax (expense) benefit	(47)	602	(89)	360
Equity earnings (losses)	118	(4)	219	(25)
Income (loss) from continuing operations, net of income tax	357	(585)	917	(255)
Income from discontinued operations, net of income tax	78	55	36	83
Net income (loss)	435	(530)	953	(172)
(Earnings) losses attributable to noncontrolling interests	(45)	(5)	(86)	12
Mandatory convertible preferred stock dividends	(35)	(25)	(71)	(53)
Preferred dividends of subsidiary	(1)	(1)	(1)	(1)
Earnings (losses) attributable to common shares	$ 354	$ (561)	$ 795	$ (214)
Basic earnings (losses) per common share:
Earnings (losses) from continuing operations attributable to common shares (in usd per share)	$ 1.03	$ (2.29)	$ 2.82	$ (1.08)
Earnings from discontinued operations attributable to common shares (in usd per share)	0.26	0.18	0.07	0.26
Earnings (losses) attributable to common shares (in usd per share)	$ 1.29	$ (2.11)	$ 2.89	$ (0.82)
Weighted-average common shares outstanding	274,987	265,837	274,831	261,906
Earnings Per Share, Diluted [Abstract]
Earnings (losses) from continuing operations attributable to common shares (in usd per share)	$ 1.01	$ (2.29)	$ 2.78	$ (1.08)
Earnings from discontinued operations attributable to common shares (in usd per share)	0.25	0.18	0.07	0.26
Earnings (losses) from continuing operations attributable to common shares (n usd per share)	$ 1.26	$ (2.11)	$ 2.85	$ (0.82)
Weighted-average common share outstanding, diluted	279,619	265,837	278,424	261,906
Natural gas [Member]
Operating expenses
Operating expenses	$ (136)	$ (179)	$ (667)	$ (527)
Electric fuel and purchased power [Member]
Operating expenses
Operating expenses	(263)	(320)	(519)	(591)
Energy-related businesses [Member]
Operating expenses
Operating expenses	(63)	(70)	(171)	(139)
San Diego Gas and Electric Company [Member]
REVENUES
Electric	973	938	1,913	1,822
Natural gas	121	113	326	284
Utilities operating revenue	1,094	1,051	2,239	2,106
Operating expenses
Cost of electric fuel and purchased power	265	323	523	597
Cost of natural gas	34	30	113	80
Operation and maintenance	276	251	562	499
Depreciation and amortization	189	169	375	335
Franchise fees and other taxes	67	63	141	132
Total operating expenses	831	836	1,714	1,643
Operating income	263	215	525	463
Other income (expense), net	19	25	41	53
Interest income	1	1	2	2
Interest expense	(102)	(53)	(205)	(105)
Income (loss) from continuing operations before income taxes and equity earnings (losses)	181	188	363	413
Income tax (expense) benefit	(35)	(42)	(40)	(98)
Net income (loss)	146	146	323	315
(Earnings) losses attributable to noncontrolling interests	(3)	0	(4)	1
Earnings (losses) attributable to common shares	143	146	319	316
Southern California Gas Company [Member]
REVENUES
Utilities operating revenue	806	772	2,167	1,898
Operating expenses
Cost of natural gas	104	150	559	439
Operation and maintenance	454	382	864	766
Depreciation and amortization	148	138	295	273
Franchise fees and other taxes	41	33	89	73
Total operating expenses	747	703	1,807	1,551
Operating income	59	69	360	347
Other income (expense), net	1	13	17	46
Interest income	1	1	1	1
Interest expense	(34)	(26)	(68)	(53)
Income (loss) from continuing operations before income taxes and equity earnings (losses)	27	57	310	341
Income tax (expense) benefit	4	(23)	(15)	(82)
Net income (loss)	31	34	295	259
Preferred stock dividends declared	(1)	(1)	(1)	(1)
Earnings (losses) attributable to common shares	$ 30	$ 33	$ 294	$ 258