CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net (loss) income	$ (632)	$ 421	$ 751	$ 3,673
Other comprehensive income (loss):
Foreign currency translation adjustments	(6)	8	(6)	517
Financial instruments	29	25	118	(135)
Pension and other postretirement benefits	(5)	5	9	24
Total other comprehensive (loss) income	18	38	121	406
Comprehensive (loss) income	(614)	459	872	4,079
Preferred dividends of subsidiary			(1)	(1)
Comprehensive (loss) income, after preferred dividends of subsidiary			871	4,078
Pretax amount [Member]
Net (loss) income	(979)	489	658	4,718
Other comprehensive income (loss):
Foreign currency translation adjustments	(4)	9	(4)	533
Financial instruments	38	36	145	(167)
Pension and other postretirement benefits	(7)	6	11	27
Total other comprehensive (loss) income	27	51	152	393
Comprehensive (loss) income	(952)	540	810	5,111
Preferred dividends of subsidiary			(1)	(1)
Comprehensive (loss) income, after preferred dividends of subsidiary			809	5,110
Income tax (expense) benefit [Member]
Net (loss) income	342	(90)	45	(1,246)
Other comprehensive income (loss):
Foreign currency translation adjustments	0	0	0	0
Financial instruments	(9)	(16)	(36)	41
Pension and other postretirement benefits	2	(1)	(2)	(3)
Total other comprehensive (loss) income	(7)	(17)	(38)	38
Comprehensive (loss) income	335	(107)	7	(1,208)
Preferred dividends of subsidiary			0	0
Comprehensive (loss) income, after preferred dividends of subsidiary			7	(1,208)
Net-of-tax amount [Member]
Net (loss) income	(637)	399	703	3,472
Other comprehensive income (loss):
Foreign currency translation adjustments	(4)	9	(4)	533
Financial instruments	29	20	109	(126)
Pension and other postretirement benefits	(5)	5	9	24
Total other comprehensive (loss) income	20	34	114	431
Comprehensive (loss) income	(617)	433	817	3,903
Preferred dividends of subsidiary			(1)	(1)
Comprehensive (loss) income, after preferred dividends of subsidiary			816	3,902
Noncontrolling Interests (after-tax) [Member]
Net (loss) income	5	22	48	201
Other comprehensive income (loss):
Foreign currency translation adjustments	(2)	(1)	(2)	(16)
Financial instruments	0	5	9	(9)
Pension and other postretirement benefits	0	0	0	0
Total other comprehensive (loss) income	(2)	4	7	(25)
Comprehensive (loss) income	3	26	55	176
Preferred dividends of subsidiary			0	0
Comprehensive (loss) income, after preferred dividends of subsidiary			55	176
San Diego Gas and Electric Company [Member]
Net (loss) income			603	633
San Diego Gas and Electric Company [Member] | Pretax amount [Member]
Net (loss) income	295	211	771	794
Other comprehensive income (loss):
Pension and other postretirement benefits	1		1	5
Total other comprehensive (loss) income	1		1	5
Comprehensive (loss) income, after preferred dividends of subsidiary	296	211	772	799
San Diego Gas and Electric Company [Member] | Income tax (expense) benefit [Member]
Net (loss) income	(90)	(33)	(168)	(161)
Other comprehensive income (loss):
Pension and other postretirement benefits	0		0	(1)
Total other comprehensive (loss) income	0		0	(1)
Comprehensive (loss) income, after preferred dividends of subsidiary	(90)	(33)	(168)	(162)
San Diego Gas and Electric Company [Member] | Net-of-tax amount [Member]
Net (loss) income	205	178	603	633
Other comprehensive income (loss):
Pension and other postretirement benefits	1		1	4
Total other comprehensive (loss) income	1		1	4
Comprehensive (loss) income, after preferred dividends of subsidiary	206	178	604	637
Southern California Gas Company [Member]
Net (loss) income	(1,126)	(24)	(624)	426
Other comprehensive income (loss):
Total other comprehensive (loss) income	1		2	1
Southern California Gas Company [Member] | Pretax amount [Member]
Net (loss) income	(1,563)	(30)	(959)	521
Other comprehensive income (loss):
Pension and other postretirement benefits	1		2	1
Total other comprehensive (loss) income	1		2	1
Comprehensive (loss) income, after preferred dividends of subsidiary	(1,562)	(30)	(957)	522
Southern California Gas Company [Member] | Income tax (expense) benefit [Member]
Net (loss) income	437	6	335	(95)
Other comprehensive income (loss):
Pension and other postretirement benefits	0		0	0
Total other comprehensive (loss) income	0		0	0
Comprehensive (loss) income, after preferred dividends of subsidiary	437	6	335	(95)
Southern California Gas Company [Member] | Net-of-tax amount [Member]
Net (loss) income	(1,126)	(24)	(624)	426
Other comprehensive income (loss):
Pension and other postretirement benefits	1		2	1
Total other comprehensive (loss) income	1		2	1
Comprehensive (loss) income, after preferred dividends of subsidiary	$ (1,125)	$ (24)	$ (622)	$ 427