CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income	$ 2,362	$ 1,126	$ 351
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Total other comprehensive (loss) income	(140)	(133)	142
Preferred dividends of subsidiary	(1)	(1)	(1)
Pretax amount [Member]
Net income	2,585	1,146	1,533
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	(161)
Foreign currency translation adjustments	(43)	(144)	107
Financial instruments		64	2
Pension and other postretirement benefits	25	(38)	20
Total other comprehensive (loss) income	(179)	(118)	129
Comprehensive income	2,406	1,028	1,662
Preferred dividends of subsidiary	(1)	(1)	(1)
Total comprehensive income, after preferred dividends of subsidiaries	2,405	1,027	1,661
Income tax (expense) benefit [Member]
Net income	(387)	(96)	(1,276)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	53
Foreign currency translation adjustments	0	0	0
Financial instruments		(21)	1
Pension and other postretirement benefits	(7)	4	(8)
Total other comprehensive (loss) income	46	(17)	(7)
Comprehensive income	(341)	(113)	(1,283)
Preferred dividends of subsidiary	0	0	0
Total comprehensive income, after preferred dividends of subsidiaries	(341)	(113)	(1,283)
Net-of-tax amount [Member]
Net income	2,198	1,050	257
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	(108)
Foreign currency translation adjustments	(43)	(144)	107
Financial instruments		43	3
Pension and other postretirement benefits	18	(34)	12
Total other comprehensive (loss) income	(133)	(135)	122
Comprehensive income	2,065	915	379
Preferred dividends of subsidiary	(1)	(1)	(1)
Total comprehensive income, after preferred dividends of subsidiaries	2,064	914	378
Noncontrolling interests (after-tax) [Member]
Net income	164	76	94
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	(10)
Foreign currency translation adjustments	3	(11)	8
Financial instruments		13	12
Pension and other postretirement benefits	0	0	0
Total other comprehensive (loss) income	(7)	2	20
Comprehensive income	157	78	114
Preferred dividends of subsidiary	0	0	0
Total comprehensive income, after preferred dividends of subsidiaries	157	78	114
Total [Member]
Net income	2,362	1,126	351
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	(118)
Foreign currency translation adjustments	(40)	(155)	115
Financial instruments		56	15
Pension and other postretirement benefits	18	(34)	12
Total other comprehensive (loss) income	(140)	(133)	142
Comprehensive income	2,222	993	493
Preferred dividends of subsidiary	(1)	(1)	(1)
Total comprehensive income, after preferred dividends of subsidiaries	2,221	992	492
San Diego Gas and Electric Company [Member]
Net income	774	676	421
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Total other comprehensive (loss) income	(2)	6	11
San Diego Gas and Electric Company [Member] | Pretax amount [Member]
Net income	938	842	562
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	0
Financial instruments		0	0
Pension and other postretirement benefits	(6)	(2)	(1)
Total other comprehensive (loss) income	(6)	(2)	(1)
Comprehensive income	932	840	561
San Diego Gas and Electric Company [Member] | Income tax (expense) benefit [Member]
Net income	(171)	(173)	(155)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	0
Financial instruments		0	0
Pension and other postretirement benefits	2	0	1
Total other comprehensive (loss) income	2	0	1
Comprehensive income	(169)	(173)	(154)
San Diego Gas and Electric Company [Member] | Net-of-tax amount [Member]
Net income	767	669	407
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	0
Financial instruments		0	0
Pension and other postretirement benefits	(4)	(2)	0
Total other comprehensive (loss) income	(4)	(2)	0
Comprehensive income	763	667	407
San Diego Gas and Electric Company [Member] | Noncontrolling interests (after-tax) [Member]
Net income	7	7	14
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	2
Financial instruments		8	11
Pension and other postretirement benefits	0	0	0
Total other comprehensive (loss) income	2	8	11
Comprehensive income	9	15	25
San Diego Gas and Electric Company [Member] | Total [Member]
Net income	774	676	421
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	2
Financial instruments		8	11
Pension and other postretirement benefits	(4)	(2)	0
Total other comprehensive (loss) income	(2)	6	11
Comprehensive income	772	682	432
Southern California Gas Company [Member]
Net income	642	401	397
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Total other comprehensive (loss) income	1	1	1
Southern California Gas Company [Member] | Pretax amount [Member]
Net income	762	493	557
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	1
Financial instruments		1
Pension and other postretirement benefits	1		1
Total other comprehensive (loss) income	2	1	1
Comprehensive income	764	494	558
Southern California Gas Company [Member] | Income tax (expense) benefit [Member]
Net income	(120)	(92)	(160)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	0
Financial instruments		0
Pension and other postretirement benefits	(1)		0
Total other comprehensive (loss) income	(1)	0	0
Comprehensive income	(121)	(92)	(160)
Southern California Gas Company [Member] | Net-of-tax amount [Member]
Net income	642	401	397
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Financial instruments	1
Financial instruments		1
Pension and other postretirement benefits	0		1
Total other comprehensive (loss) income	1	1	1
Comprehensive income	$ 643	$ 402	$ 398