CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net income	$ 909	$ 334	$ 1,862	$ 162
Other comprehensive income (loss):
Total other comprehensive (loss) income	(142)	(9)	(190)	32
Pretax amount [Member]
Net income	762	477	1,898	23
Other comprehensive income (loss):
Foreign currency translation adjustments	(91)	(16)	(45)	(78)
Financial instruments	(55)	22	(213)	145
Pension and other postretirement benefits	(3)	(14)	22	(8)
Total other comprehensive (loss) income	(149)	(8)	(236)	59
Comprehensive income			1,662	82
Preferred dividends of subsidiary			(1)	(1)
Comprehensive (loss) income, after preferred dividends of subsidiary	613	469	1,661	81
Income tax (expense) benefit [Member]
Net income	87	(167)	(182)	127
Other comprehensive income (loss):
Foreign currency translation adjustments	0	0	0	0
Financial instruments	18	(7)	70	(45)
Pension and other postretirement benefits	1	4	(6)	3
Total other comprehensive (loss) income	19	(3)	64	(42)
Comprehensive income			(118)	85
Preferred dividends of subsidiary			0	0
Comprehensive (loss) income, after preferred dividends of subsidiary	106	(170)	(118)	85
Net-of-tax amount [Member]
Net income	849	310	1,716	150
Other comprehensive income (loss):
Foreign currency translation adjustments	(91)	(16)	(45)	(78)
Financial instruments	(37)	15	(143)	100
Pension and other postretirement benefits	(2)	(10)	16	(5)
Total other comprehensive (loss) income	(130)	(11)	(172)	17
Comprehensive income			1,544	167
Preferred dividends of subsidiary			(1)	(1)
Comprehensive (loss) income, after preferred dividends of subsidiary	719	299	1,543	166
Noncontrolling Interests (after-tax) [Member]
Net income	60	24	146	12
Other comprehensive income (loss):
Foreign currency translation adjustments	(8)	(2)	(2)	(5)
Financial instruments	(4)	4	(16)	20
Pension and other postretirement benefits	0	0	0	0
Total other comprehensive (loss) income	(12)	2	(18)	15
Comprehensive income			128	27
Preferred dividends of subsidiary			0	0
Comprehensive (loss) income, after preferred dividends of subsidiary	48	26	128	27
Total [Member]
Net income	909	334	1,862	162
Other comprehensive income (loss):
Foreign currency translation adjustments	(99)	(18)	(47)	(83)
Financial instruments	(41)	19	(159)	120
Pension and other postretirement benefits	(2)	(10)	16	(5)
Total other comprehensive (loss) income	(142)	(9)	(190)	32
Comprehensive income			1,672	194
Preferred dividends of subsidiary			(1)	(1)
Comprehensive (loss) income, after preferred dividends of subsidiary	767	325	1,671	193
San Diego Gas and Electric Company [Member]
Net income	266	216	589	531
Other comprehensive income (loss):
Total other comprehensive (loss) income	1	(4)	3	1
San Diego Gas and Electric Company [Member] | Pretax amount [Member]
Net income	334	258	693	672
Other comprehensive income (loss):
Financial instruments	0	0	0	0
Pension and other postretirement benefits		(8)	1	(8)
Total other comprehensive (loss) income	0	(8)	1	(8)
Comprehensive (loss) income, after preferred dividends of subsidiary	334	250	694	664
San Diego Gas and Electric Company [Member] | Income tax (expense) benefit [Member]
Net income	(71)	(53)	(111)	(151)
Other comprehensive income (loss):
Financial instruments	0	0	0	0
Pension and other postretirement benefits		2	0	2
Total other comprehensive (loss) income	0	2	0	2
Comprehensive (loss) income, after preferred dividends of subsidiary	(71)	(51)	(111)	(149)
San Diego Gas and Electric Company [Member] | Net-of-tax amount [Member]
Net income	263	205	582	521
Other comprehensive income (loss):
Financial instruments	0	0	0	0
Pension and other postretirement benefits		(6)	1	(6)
Total other comprehensive (loss) income	0	(6)	1	(6)
Comprehensive (loss) income, after preferred dividends of subsidiary	263	199	583	515
San Diego Gas and Electric Company [Member] | Noncontrolling Interests (after-tax) [Member]
Net income	3	11	7	10
Other comprehensive income (loss):
Financial instruments	1	2	2	7
Pension and other postretirement benefits		0	0	0
Total other comprehensive (loss) income	1	2	2	7
Comprehensive (loss) income, after preferred dividends of subsidiary	4	13	9	17
San Diego Gas and Electric Company [Member] | Total [Member]
Net income	266	216	589	531
Other comprehensive income (loss):
Financial instruments	1	2	2	7
Pension and other postretirement benefits		(6)	1	(6)
Total other comprehensive (loss) income	1	(4)	3	1
Comprehensive (loss) income, after preferred dividends of subsidiary	267	212	592	532
Southern California Gas Company [Member]
Net income	143	(14)	438	245
Other comprehensive income (loss):
Total other comprehensive (loss) income	1		5	1
Southern California Gas Company [Member] | Pretax amount [Member]
Net income	178	(21)	488	320
Other comprehensive income (loss):
Financial instruments	1		1
Pension and other postretirement benefits			6	1
Total other comprehensive (loss) income	1		7	1
Comprehensive (loss) income, after preferred dividends of subsidiary	179	(21)	495	321
Southern California Gas Company [Member] | Income tax (expense) benefit [Member]
Net income	(35)	7	(50)	(75)
Other comprehensive income (loss):
Financial instruments	0		0
Pension and other postretirement benefits			(2)	0
Total other comprehensive (loss) income	0		(2)	0
Comprehensive (loss) income, after preferred dividends of subsidiary	(35)	7	(52)	(75)
Southern California Gas Company [Member] | Net-of-tax amount [Member]
Net income	143	(14)	438	245
Other comprehensive income (loss):
Financial instruments	1		1
Pension and other postretirement benefits			4	1
Total other comprehensive (loss) income	1		5	1
Comprehensive (loss) income, after preferred dividends of subsidiary	$ 144	$ (14)	$ 443	$ 246