CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net income	$ 455	$ 2,305	$ 1,383	$ 3,252
Other comprehensive income (loss):
Total other comprehensive (loss) income	(12)	651	103	368
Pretax amount [Member]
Net income	584	3,619	1,637	4,229
Other comprehensive income (loss):
Foreign currency translation adjustments	5	662		524
Financial instruments	(14)	(15)	107	(203)
Pension and other postretirement benefits	1	(3)	18	21
Total other comprehensive (loss) income	(8)	644	125	342
Comprehensive income	576	4,263	1,762	4,571
Preferred dividends of subsidiary	(1)	(1)	(1)	(1)
Comprehensive (loss) income, after preferred dividends of subsidiary	575	4,262	1,761	4,570
Income tax (expense) benefit [Member]
Net income	(139)	(1,342)	(297)	(1,156)
Other comprehensive income (loss):
Foreign currency translation adjustments	0	0		0
Financial instruments	2	4	(27)	57
Pension and other postretirement benefits	(1)	0	(4)	(2)
Total other comprehensive (loss) income	1	4	(31)	55
Comprehensive income	(138)	(1,338)	(328)	(1,101)
Preferred dividends of subsidiary	0	0	0	0
Comprehensive (loss) income, after preferred dividends of subsidiary	(138)	(1,338)	(328)	(1,101)
Net-of-tax amount [Member]
Net income	445	2,277	1,340	3,073
Other comprehensive income (loss):
Foreign currency translation adjustments	5	662		524
Financial instruments	(12)	(11)	80	(146)
Pension and other postretirement benefits	0	(3)	14	19
Total other comprehensive (loss) income	(7)	648	94	397
Comprehensive income	438	2,925	1,434	3,470
Preferred dividends of subsidiary	(1)	(1)	(1)	(1)
Comprehensive (loss) income, after preferred dividends of subsidiary	437	2,924	1,433	3,469
Noncontrolling Interests (after-tax) [Member]
Net income	10	28	43	179
Other comprehensive income (loss):
Foreign currency translation adjustments	1	5		(15)
Financial instruments	(6)	(2)	9	(14)
Pension and other postretirement benefits	0	0	0	0
Total other comprehensive (loss) income	(5)	3	9	(29)
Comprehensive income	5	31	52	150
Preferred dividends of subsidiary	0	0	0	0
Comprehensive (loss) income, after preferred dividends of subsidiary	5	31	52	150
Total [Member]
Net income	455	2,305	1,383	3,252
Other comprehensive income (loss):
Foreign currency translation adjustments	6	667		509
Financial instruments	(18)	(13)	89	(160)
Pension and other postretirement benefits	0	(3)	14	19
Total other comprehensive (loss) income	(12)	651	103	368
Comprehensive income	443	2,956	1,486	3,620
Preferred dividends of subsidiary	(1)	(1)	(1)	(1)
Comprehensive (loss) income, after preferred dividends of subsidiary	442	2,955	1,485	3,619
San Diego Gas and Electric Company [Member]
Net income			398	455
San Diego Gas and Electric Company [Member] | Pretax amount [Member]
Net income	219	263	476	583
Other comprehensive income (loss):
Pension and other postretirement benefits		5		5
Total other comprehensive (loss) income		5		5
Comprehensive (loss) income, after preferred dividends of subsidiary	219	268	476	588
San Diego Gas and Electric Company [Member] | Income tax (expense) benefit [Member]
Net income	(33)	(70)	(78)	(128)
Other comprehensive income (loss):
Pension and other postretirement benefits		(1)		(1)
Total other comprehensive (loss) income		(1)		(1)
Comprehensive (loss) income, after preferred dividends of subsidiary	(33)	(71)	(78)	(129)
San Diego Gas and Electric Company [Member] | Net-of-tax amount [Member]
Net income	186	193	398	455
Other comprehensive income (loss):
Pension and other postretirement benefits		4		4
Total other comprehensive (loss) income		4		4
Comprehensive (loss) income, after preferred dividends of subsidiary	186	197	398	459
Southern California Gas Company [Member]
Net income	95	147	502	450
Other comprehensive income (loss):
Total other comprehensive (loss) income	1	1	1	1
Southern California Gas Company [Member] | Pretax amount [Member]
Net income	103	196	604	551
Other comprehensive income (loss):
Pension and other postretirement benefits	1	1	1	1
Total other comprehensive (loss) income	1	1	1	1
Comprehensive (loss) income, after preferred dividends of subsidiary	104	197	605	552
Southern California Gas Company [Member] | Income tax (expense) benefit [Member]
Net income	(8)	(49)	(102)	(101)
Other comprehensive income (loss):
Pension and other postretirement benefits	0	0	0	0
Total other comprehensive (loss) income	0	0	0	0
Comprehensive (loss) income, after preferred dividends of subsidiary	(8)	(49)	(102)	(101)
Southern California Gas Company [Member] | Net-of-tax amount [Member]
Net income	95	147	502	450
Other comprehensive income (loss):
Pension and other postretirement benefits	1	1	1	1
Total other comprehensive (loss) income	1	1	1	1
Comprehensive (loss) income, after preferred dividends of subsidiary	$ 96	$ 148	$ 503	$ 451