CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net income	$ 928	$ 947
Other comprehensive income (loss):
Total other comprehensive (loss) income	115	(283)
Pretax amount [Member]
Net income	1,053	610
Other comprehensive income (loss):
Foreign currency translation adjustments	(5)	(138)
Financial instruments	121	(188)
Pension and other postretirement benefits	17	24
Total other comprehensive (loss) income	133	(302)
Comprehensive income	1,186	308
Income tax (expense) benefit [Member]
Net income	(158)	186
Other comprehensive income (loss):
Foreign currency translation adjustments	0	0
Financial instruments	(29)	53
Pension and other postretirement benefits	(3)	(2)
Total other comprehensive (loss) income	(32)	51
Comprehensive income	(190)	237
Net-of-tax amount [Member]
Net income	895	796
Other comprehensive income (loss):
Foreign currency translation adjustments	(5)	(138)
Financial instruments	92	(135)
Pension and other postretirement benefits	14	22
Total other comprehensive (loss) income	101	(251)
Comprehensive income	996	545
Noncontrolling Interests (after-tax) [Member]
Net income	33	151
Other comprehensive income (loss):
Foreign currency translation adjustments	(1)	(20)
Financial instruments	15	(12)
Pension and other postretirement benefits	0	0
Total other comprehensive (loss) income	14	(32)
Comprehensive income	47	119
Total [Member]
Net income	928	947
Other comprehensive income (loss):
Foreign currency translation adjustments	(6)	(158)
Financial instruments	107	(147)
Pension and other postretirement benefits	14	22
Total other comprehensive (loss) income	115	(283)
Comprehensive income	1,043	664
San Diego Gas and Electric Company [Member]
Net income	212	262
San Diego Gas and Electric Company [Member] | Pretax amount [Member]
Net income	257	320
Other comprehensive income (loss):
Comprehensive (loss) income, after preferred dividends of subsidiary	257	320
San Diego Gas and Electric Company [Member] | Income tax (expense) benefit [Member]
Net income	(45)	(58)
Other comprehensive income (loss):
Comprehensive (loss) income, after preferred dividends of subsidiary	(45)	(58)
San Diego Gas and Electric Company [Member] | Net-of-tax amount [Member]
Net income	212	262
Other comprehensive income (loss):
Comprehensive (loss) income, after preferred dividends of subsidiary	212	262
Southern California Gas Company [Member]
Net income	407	303
Southern California Gas Company [Member] | Pretax amount [Member]
Net income	501	355
Other comprehensive income (loss):
Comprehensive (loss) income, after preferred dividends of subsidiary	501	355
Southern California Gas Company [Member] | Income tax (expense) benefit [Member]
Net income	(94)	(52)
Other comprehensive income (loss):
Comprehensive (loss) income, after preferred dividends of subsidiary	(94)	(52)
Southern California Gas Company [Member] | Net-of-tax amount [Member]
Net income	407	303
Other comprehensive income (loss):
Comprehensive (loss) income, after preferred dividends of subsidiary	$ 407	$ 303