CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net (loss) income	$ 435	$ (530)	$ 953	$ (172)
Other comprehensive income (loss):
Total other comprehensive (loss) income	(37)	(58)	(48)	41
Pretax amount [Member]
Net (loss) income	466	(1,118)	1,136	(454)
Other comprehensive income (loss):
Foreign currency translation adjustments	14	(86)	46	(62)
Financial instruments	(90)	35	(158)	123
Pension and other postretirement benefits	21	3	25	6
Total other comprehensive (loss) income	(55)	(48)	(87)	67
Comprehensive (loss) income	411	(1,166)	1,049	(387)
Preferred dividends of subsidiary	(1)	(1)	(1)	(1)
Comprehensive (loss) income, after preferred dividends of subsidiary	410	(1,167)	1,048	(388)
Income tax (expense) benefit [Member]
Net (loss) income	(76)	583	(269)	294
Other comprehensive income (loss):
Foreign currency translation adjustments	0	0	0	0
Financial instruments	30	(8)	52	(38)
Pension and other postretirement benefits	(6)	0	(7)	(1)
Total other comprehensive (loss) income	24	(8)	45	(39)
Comprehensive (loss) income	(52)	575	(224)	255
Preferred dividends of subsidiary	0	0	0	0
Comprehensive (loss) income, after preferred dividends of subsidiary	(52)	575	(224)	255
Net-of-tax amount [Member]
Net (loss) income	390	(535)	867	(160)
Other comprehensive income (loss):
Foreign currency translation adjustments	14	(86)	46	(62)
Financial instruments	(60)	27	(106)	85
Pension and other postretirement benefits	15	3	18	5
Total other comprehensive (loss) income	(31)	(56)	(42)	28
Comprehensive (loss) income	359	(591)	825	(132)
Preferred dividends of subsidiary	(1)	(1)	(1)	(1)
Comprehensive (loss) income, after preferred dividends of subsidiary	358	(592)	824	(133)
Noncontrolling Interests (after-tax) [Member]
Net (loss) income	45	5	86	(12)
Other comprehensive income (loss):
Foreign currency translation adjustments	2	(8)	6	(3)
Financial instruments	(8)	6	(12)	16
Pension and other postretirement benefits	0	0	0	0
Total other comprehensive (loss) income	(6)	(2)	(6)	13
Comprehensive (loss) income	39	3	80	1
Preferred dividends of subsidiary	0	0	0	0
Comprehensive (loss) income, after preferred dividends of subsidiary	39	3	80	1
Total [Member]
Net (loss) income	435	(530)	953	(172)
Other comprehensive income (loss):
Foreign currency translation adjustments	16	(94)	52	(65)
Financial instruments	(68)	33	(118)	101
Pension and other postretirement benefits	15	3	18	5
Total other comprehensive (loss) income	(37)	(58)	(48)	41
Comprehensive (loss) income	398	(588)	905	(131)
Preferred dividends of subsidiary	(1)	(1)	(1)	(1)
Comprehensive (loss) income, after preferred dividends of subsidiary	397	(589)	904	(132)
San Diego Gas and Electric Company [Member]
Net (loss) income	146	146	323	315
Other comprehensive income (loss):
Total other comprehensive (loss) income	1	1	2	5
San Diego Gas and Electric Company [Member] | Pretax amount [Member]
Net (loss) income	178	188	359	414
Other comprehensive income (loss):
Financial instruments		0	0	0
Pension and other postretirement benefits	1		1
Total other comprehensive (loss) income	1	0	1	0
Comprehensive (loss) income, after preferred dividends of subsidiary	179	188	360	414
San Diego Gas and Electric Company [Member] | Income tax (expense) benefit [Member]
Net (loss) income	(35)	(42)	(40)	(98)
Other comprehensive income (loss):
Financial instruments		0	0	0
Pension and other postretirement benefits	0		0
Total other comprehensive (loss) income	0	0	0	0
Comprehensive (loss) income, after preferred dividends of subsidiary	(35)	(42)	(40)	(98)
San Diego Gas and Electric Company [Member] | Net-of-tax amount [Member]
Net (loss) income	143	146	319	316
Other comprehensive income (loss):
Financial instruments		0	0	0
Pension and other postretirement benefits	1		1
Total other comprehensive (loss) income	1	0	1	0
Comprehensive (loss) income, after preferred dividends of subsidiary	144	146	320	316
San Diego Gas and Electric Company [Member] | Noncontrolling Interests (after-tax) [Member]
Net (loss) income	3	0	4	(1)
Other comprehensive income (loss):
Financial instruments		1	1	5
Pension and other postretirement benefits	0		0
Total other comprehensive (loss) income	0	1	1	5
Comprehensive (loss) income, after preferred dividends of subsidiary	3	1	5	4
San Diego Gas and Electric Company [Member] | Total [Member]
Net (loss) income	146	146	323	315
Other comprehensive income (loss):
Financial instruments		1	1	5
Pension and other postretirement benefits	1		1
Total other comprehensive (loss) income	1	1	2	5
Comprehensive (loss) income, after preferred dividends of subsidiary	147	147	325	320
Southern California Gas Company [Member]
Net (loss) income	31	34	295	259
Other comprehensive income (loss):
Total other comprehensive (loss) income	4	1	4	1
Southern California Gas Company [Member] | Pretax amount [Member]
Net (loss) income	27	57	310	341
Other comprehensive income (loss):
Pension and other postretirement benefits	6	1	6	1
Total other comprehensive (loss) income	6	1	6	1
Comprehensive (loss) income, after preferred dividends of subsidiary	33	58	316	342
Southern California Gas Company [Member] | Income tax (expense) benefit [Member]
Net (loss) income	4	(23)	(15)	(82)
Other comprehensive income (loss):
Pension and other postretirement benefits	(2)	0	(2)	0
Total other comprehensive (loss) income	(2)	0	(2)	0
Comprehensive (loss) income, after preferred dividends of subsidiary	2	(23)	(17)	(82)
Southern California Gas Company [Member] | Net-of-tax amount [Member]
Net (loss) income	31	34	295	259
Other comprehensive income (loss):
Pension and other postretirement benefits	4	1	4	1
Total other comprehensive (loss) income	4	1	4	1
Comprehensive (loss) income, after preferred dividends of subsidiary	$ 35	$ 35	$ 299	$ 260