CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 947	$ 518
Other comprehensive income (loss):
Total other comprehensive (loss) income	(283)	(11)
Pretax amount [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	610	670
Other comprehensive income (loss):
Foreign currency translation adjustments	(138)	32
Financial instruments	(188)	(68)
Pension and other postretirement benefits	24	4
Total other comprehensive (loss) income	(302)	(32)
Comprehensive (loss) income, after preferred dividends of subsidiary	308	638
Income tax (expense) benefit [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	186	(193)
Other comprehensive income (loss):
Foreign currency translation adjustments	0	0
Financial instruments	53	22
Pension and other postretirement benefits	(2)	(1)
Total other comprehensive (loss) income	51	21
Comprehensive (loss) income, after preferred dividends of subsidiary	237	(172)
Net-of-tax amount [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	796	477
Other comprehensive income (loss):
Foreign currency translation adjustments	(138)	32
Financial instruments	(135)	(46)
Pension and other postretirement benefits	22	3
Total other comprehensive (loss) income	(251)	(11)
Comprehensive (loss) income, after preferred dividends of subsidiary	545	466
Noncontrolling Interests (after-tax) [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	151	41
Other comprehensive income (loss):
Foreign currency translation adjustments	(20)	4
Financial instruments	(12)	(4)
Pension and other postretirement benefits	0	0
Total other comprehensive (loss) income	(32)	0
Comprehensive (loss) income, after preferred dividends of subsidiary	119	41
Total [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	947	518
Other comprehensive income (loss):
Foreign currency translation adjustments	(158)	36
Financial instruments	(147)	(50)
Pension and other postretirement benefits	22	3
Total other comprehensive (loss) income	(283)	(11)
Comprehensive (loss) income, after preferred dividends of subsidiary	664	507
San Diego Gas and Electric Company [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	262	177
Other comprehensive income (loss):
Total other comprehensive (loss) income		1
San Diego Gas and Electric Company [Member] | Pretax amount [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	320	181
Other comprehensive income (loss):
Financial instruments		0
Total other comprehensive (loss) income		0
Comprehensive (loss) income, after preferred dividends of subsidiary	320	181
San Diego Gas and Electric Company [Member] | Income tax (expense) benefit [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(58)	(5)
Other comprehensive income (loss):
Financial instruments		0
Total other comprehensive (loss) income		0
Comprehensive (loss) income, after preferred dividends of subsidiary	(58)	(5)
San Diego Gas and Electric Company [Member] | Net-of-tax amount [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	262	176
Other comprehensive income (loss):
Financial instruments		0
Total other comprehensive (loss) income		0
Comprehensive (loss) income, after preferred dividends of subsidiary	262	176
San Diego Gas and Electric Company [Member] | Noncontrolling Interests (after-tax) [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	0	1
Other comprehensive income (loss):
Financial instruments		1
Total other comprehensive (loss) income		1
Comprehensive (loss) income, after preferred dividends of subsidiary	0	2
San Diego Gas and Electric Company [Member] | Total [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	262	177
Other comprehensive income (loss):
Financial instruments		1
Total other comprehensive (loss) income		1
Comprehensive (loss) income, after preferred dividends of subsidiary	262	178
Southern California Gas Company [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	303	264
Southern California Gas Company [Member] | Pretax amount [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	355	283
Other comprehensive income (loss):
Comprehensive (loss) income, after preferred dividends of subsidiary	355	283
Southern California Gas Company [Member] | Income tax (expense) benefit [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(52)	(19)
Other comprehensive income (loss):
Comprehensive (loss) income, after preferred dividends of subsidiary	(52)	(19)
Southern California Gas Company [Member] | Net-of-tax amount [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	303	264
Other comprehensive income (loss):
Comprehensive (loss) income, after preferred dividends of subsidiary	$ 303	$ 264