CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Net income	$ 1,126	$ 351	[1]	$ 1,519	[1]
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Total other comprehensive (loss) income	(133)	142		52
Preferred dividends of subsidiary	(1)	(1)	[1]	(1)	[1]
Pretax amount [Member]
Net income	1,146	1,533		1,760
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	(144)	107		42
Financial instruments	64	2		(6)
Pension and other postretirement benefits	(38)	20		(13)
Total other comprehensive (loss) income	(118)	129		23
Comprehensive income	1,028	1,662		1,783
Preferred dividends of subsidiary	(1)	(1)		(1)
Total comprehensive income, after preferred dividends of subsidiaries	1,027	1,661		1,782
Income tax (expense) benefit [Member]
Net income	(96)	(1,276)		(389)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	0	0		0
Financial instruments	(21)	1		11
Pension and other postretirement benefits	4	(8)		4
Total other comprehensive (loss) income	(17)	(7)		15
Comprehensive income	(113)	(1,283)		(374)
Preferred dividends of subsidiary	0	0		0
Total comprehensive income, after preferred dividends of subsidiaries	(113)	(1,283)		(374)
Net-of-tax amount [Member]
Net income	1,050	257		1,371
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	(144)	107		42
Financial instruments	43	3		5
Pension and other postretirement benefits	(34)	12		(9)
Total other comprehensive (loss) income	(135)	122		38
Comprehensive income	915	379		1,409
Preferred dividends of subsidiary	(1)	(1)		(1)
Total comprehensive income, after preferred dividends of subsidiaries	914	378		1,408
Noncontrolling interests (after-tax) [Member]
Net income	76	94		148
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	(11)	8		(3)
Financial instruments	13	12		17
Pension and other postretirement benefits	0	0		0
Total other comprehensive (loss) income	2	20		14
Comprehensive income	78	114		162
Preferred dividends of subsidiary	0	0		0
Total comprehensive income, after preferred dividends of subsidiaries	78	114		162
Total [Member]
Net income	1,126	351		1,519
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	(155)	115		39
Financial instruments	56	15		22
Pension and other postretirement benefits	(34)	12		(9)
Total other comprehensive (loss) income	(133)	142		52
Comprehensive income	993	493		1,571
Preferred dividends of subsidiary	(1)	(1)		(1)
Total comprehensive income, after preferred dividends of subsidiaries	992	492		1,570
San Diego Gas and Electric Company [Member]
Net income	676	421	[1]	565	[1]
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Total other comprehensive (loss) income	6	11		10
San Diego Gas and Electric Company [Member] | Pretax amount [Member]
Net income	842	562		850
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	0	0		0
Pension and other postretirement benefits	(2)	(1)
Total other comprehensive (loss) income	(2)	(1)		0
Comprehensive income	840	561		850
San Diego Gas and Electric Company [Member] | Income tax (expense) benefit [Member]
Net income	(173)	(155)		(280)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	0	0		0
Pension and other postretirement benefits	0	1
Total other comprehensive (loss) income	0	1		0
Comprehensive income	(173)	(154)		(280)
San Diego Gas and Electric Company [Member] | Net-of-tax amount [Member]
Net income	669	407		570
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	0	0		0
Pension and other postretirement benefits	(2)	0
Total other comprehensive (loss) income	(2)	0		0
Comprehensive income	667	407		570
San Diego Gas and Electric Company [Member] | Noncontrolling interests (after-tax) [Member]
Net income	7	14		(5)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	8	11		10
Pension and other postretirement benefits	0	0
Total other comprehensive (loss) income	8	11		10
Comprehensive income	15	25		5
San Diego Gas and Electric Company [Member] | Total [Member]
Net income	676	421		565
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	8	11		10
Pension and other postretirement benefits	(2)	0
Total other comprehensive (loss) income	6	11		10
Comprehensive income	682	432		575
Southern California Gas Company [Member]
Net income	401	397	[1]	350	[1]
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Total other comprehensive (loss) income	1	1		(3)
Southern California Gas Company [Member] | Pretax amount [Member]
Net income	493	557		493
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	1			1
Pension and other postretirement benefits		1		(6)
Total other comprehensive (loss) income	1	1		(5)
Comprehensive income	494	558		488
Southern California Gas Company [Member] | Income tax (expense) benefit [Member]
Net income	(92)	(160)		(143)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	0			0
Pension and other postretirement benefits		0		2
Total other comprehensive (loss) income	0	0		2
Comprehensive income	(92)	(160)		(141)
Southern California Gas Company [Member] | Net-of-tax amount [Member]
Net income	401	397		350
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	1			1
Pension and other postretirement benefits		1		(4)
Total other comprehensive (loss) income	1	1		(3)
Comprehensive income	$ 402	$ 398		$ 347

[1] As adjusted for the retrospective adoption of ASU 2017-07, which we discuss in Note 2, and a reclassification to conform to current year presentation, which we discuss in Note 1.