CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income	$ 421	$ 909	$ 3,673	$ 1,862
Other comprehensive income (loss):
Total other comprehensive (loss) income	38	(142)	406	(190)
Pretax amount [Member]
Net income	489	762	4,718	1,898
Other comprehensive income (loss):
Foreign currency translation adjustments	9	(91)	533	(45)
Financial instruments	36	(55)	(167)	(213)
Pension and other postretirement benefits	6	(3)	27	22
Total other comprehensive (loss) income	51	(149)	393	(236)
Comprehensive income	540	613	5,111	1,662
Preferred dividends of subsidiary			(1)	(1)
Comprehensive (loss) income, after preferred dividends of subsidiary			5,110	1,661
Income tax (expense) benefit [Member]
Net income	(90)	87	(1,246)	(182)
Other comprehensive income (loss):
Foreign currency translation adjustments	0	0	0	0
Financial instruments	(16)	18	41	70
Pension and other postretirement benefits	(1)	1	(3)	(6)
Total other comprehensive (loss) income	(17)	19	38	64
Comprehensive income	(107)	106	(1,208)	(118)
Preferred dividends of subsidiary			0	0
Comprehensive (loss) income, after preferred dividends of subsidiary			(1,208)	(118)
Net-of-tax amount [Member]
Net income	399	849	3,472	1,716
Other comprehensive income (loss):
Foreign currency translation adjustments	9	(91)	533	(45)
Financial instruments	20	(37)	(126)	(143)
Pension and other postretirement benefits	5	(2)	24	16
Total other comprehensive (loss) income	34	(130)	431	(172)
Comprehensive income	433	719	3,903	1,544
Preferred dividends of subsidiary			(1)	(1)
Comprehensive (loss) income, after preferred dividends of subsidiary			3,902	1,543
Noncontrolling Interests (after-tax) [Member]
Net income	22	60	201	146
Other comprehensive income (loss):
Foreign currency translation adjustments	(1)	(8)	(16)	(2)
Financial instruments	5	(4)	(9)	(16)
Pension and other postretirement benefits	0	0	0	0
Total other comprehensive (loss) income	4	(12)	(25)	(18)
Comprehensive income	26	48	176	128
Preferred dividends of subsidiary			0	0
Comprehensive (loss) income, after preferred dividends of subsidiary			176	128
Total [Member]
Net income	421	909	3,673	1,862
Other comprehensive income (loss):
Foreign currency translation adjustments	8	(99)	517	(47)
Financial instruments	25	(41)	(135)	(159)
Pension and other postretirement benefits	5	(2)	24	16
Total other comprehensive (loss) income	38	(142)	406	(190)
Comprehensive income	459	767	4,079	1,672
Preferred dividends of subsidiary			(1)	(1)
Comprehensive (loss) income, after preferred dividends of subsidiary			4,078	1,671
San Diego Gas and Electric Company [Member]
Net income	178	266	633	589
Other comprehensive income (loss):
Total other comprehensive (loss) income		1	4	3
San Diego Gas and Electric Company [Member] | Pretax amount [Member]
Net income	211	334	794	693
Other comprehensive income (loss):
Financial instruments		0		0
Pension and other postretirement benefits			5	1
Total other comprehensive (loss) income		0	5	1
Comprehensive (loss) income, after preferred dividends of subsidiary	211	334	799	694
San Diego Gas and Electric Company [Member] | Income tax (expense) benefit [Member]
Net income	(33)	(71)	(161)	(111)
Other comprehensive income (loss):
Financial instruments		0		0
Pension and other postretirement benefits			(1)	0
Total other comprehensive (loss) income		0	(1)	0
Comprehensive (loss) income, after preferred dividends of subsidiary	(33)	(71)	(162)	(111)
San Diego Gas and Electric Company [Member] | Net-of-tax amount [Member]
Net income	178	263	633	582
Other comprehensive income (loss):
Financial instruments		0		0
Pension and other postretirement benefits			4	1
Total other comprehensive (loss) income		0	4	1
Comprehensive (loss) income, after preferred dividends of subsidiary	178	263	637	583
San Diego Gas and Electric Company [Member] | Noncontrolling Interests (after-tax) [Member]
Net income	0	3	0	7
Other comprehensive income (loss):
Financial instruments		1		2
Pension and other postretirement benefits			0	0
Total other comprehensive (loss) income		1	0	2
Comprehensive (loss) income, after preferred dividends of subsidiary	0	4	0	9
San Diego Gas and Electric Company [Member] | Total [Member]
Net income	178	266	633	589
Other comprehensive income (loss):
Financial instruments		1		2
Pension and other postretirement benefits			4	1
Total other comprehensive (loss) income		1	4	3
Comprehensive (loss) income, after preferred dividends of subsidiary	178	267	637	592
Southern California Gas Company [Member]
Net income	(24)	143	426	438
Other comprehensive income (loss):
Total other comprehensive (loss) income		1	1	5
Southern California Gas Company [Member] | Pretax amount [Member]
Net income	(30)	178	521	488
Other comprehensive income (loss):
Financial instruments		1		1
Pension and other postretirement benefits			1	6
Total other comprehensive (loss) income		1	1	7
Comprehensive (loss) income, after preferred dividends of subsidiary	(30)	179	522	495
Southern California Gas Company [Member] | Income tax (expense) benefit [Member]
Net income	6	(35)	(95)	(50)
Other comprehensive income (loss):
Financial instruments		0		0
Pension and other postretirement benefits			0	(2)
Total other comprehensive (loss) income		0	0	(2)
Comprehensive (loss) income, after preferred dividends of subsidiary	6	(35)	(95)	(52)
Southern California Gas Company [Member] | Net-of-tax amount [Member]
Net income	(24)	143	426	438
Other comprehensive income (loss):
Financial instruments		1		1
Pension and other postretirement benefits			1	4
Total other comprehensive (loss) income		1	1	5
Comprehensive (loss) income, after preferred dividends of subsidiary	$ (24)	$ 144	$ 427	$ 443