CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net income	$ 452	$ 364	[1],[2]
Other comprehensive income (loss):
Comprehensive income	515	349
Pretax amount [Member]
Net income	736	461	[3]
Other comprehensive income (loss):
Foreign currency translation adjustments	46	68	[3]
Financial instruments	7	(159)	[3]
Pension and other postretirement benefits	3	2	[3]
Total other comprehensive income (loss)	56	(89)	[3]
Comprehensive income	792	372	[3]
Income tax (expense) benefit [Member]
Net income	(295)	(108)	[3]
Other comprehensive income (loss):
Foreign currency translation adjustments	0	0	[3]
Financial instruments	(3)	75	[3]
Pension and other postretirement benefits	(1)	(1)	[3]
Total other comprehensive income (loss)	(4)	74	[3]
Comprehensive income	(299)	(34)	[3]
Net-of-tax amount [Member]
Net income	441	353	[3]
Other comprehensive income (loss):
Foreign currency translation adjustments	46	68	[3]
Financial instruments	4	(84)	[3]
Pension and other postretirement benefits	2	1	[3]
Total other comprehensive income (loss)	52	(15)	[3]
Comprehensive income	493	338	[3]
Noncontrolling Interests (after-tax) [Member]
Net income	11	11	[3]
Other comprehensive income (loss):
Foreign currency translation adjustments	9	5	[3]
Financial instruments	2	(5)	[3]
Pension and other postretirement benefits	0	0	[3]
Total other comprehensive income (loss)	11	0	[3]
Comprehensive income	22	11	[3]
Total [Member]
Net income	452	364	[3]
Other comprehensive income (loss):
Foreign currency translation adjustments	55	73	[3]
Financial instruments	6	(89)	[3]
Pension and other postretirement benefits	2	1	[3]
Total other comprehensive income (loss)	63	(15)	[3]
Comprehensive income	515	349	[3]
San Diego Gas and Electric Company [Member]
Net income	157	137	[1],[2]
Other comprehensive income (loss):
Comprehensive income	160	135
San Diego Gas and Electric Company [Member] | Pretax amount [Member]
Net income	245	201	[3]
Other comprehensive income (loss):
Financial instruments	0	0	[3]
Total other comprehensive income (loss)	0	0	[3]
Comprehensive income	245	201	[3]
San Diego Gas and Electric Company [Member] | Income tax (expense) benefit [Member]
Net income	(90)	(65)	[3]
Other comprehensive income (loss):
Financial instruments	0	0	[3]
Total other comprehensive income (loss)	0	0	[3]
Comprehensive income	(90)	(65)	[3]
San Diego Gas and Electric Company [Member] | Net-of-tax amount [Member]
Net income	155	136	[3]
Other comprehensive income (loss):
Financial instruments	0	0	[3]
Total other comprehensive income (loss)	0	0	[3]
Comprehensive income	155	136	[3]
San Diego Gas and Electric Company [Member] | Noncontrolling Interests (after-tax) [Member]
Net income	2	1	[3]
Other comprehensive income (loss):
Financial instruments	3	(2)	[3]
Total other comprehensive income (loss)	3	(2)	[3]
Comprehensive income	5	(1)	[3]
San Diego Gas and Electric Company [Member] | Total [Member]
Net income	157	137	[3]
Other comprehensive income (loss):
Financial instruments	3	(2)	[3]
Total other comprehensive income (loss)	3	(2)	[3]
Comprehensive income	160	135	[3]
Southern California Gas Company [Member]
Other comprehensive income (loss):
Comprehensive income	203	199
Southern California Gas Company [Member] | Pretax amount [Member]
Net income	301	282	[3]
Other comprehensive income (loss):
Comprehensive income	301	282
Southern California Gas Company [Member] | Income tax (expense) benefit [Member]
Net income	(98)	(83)	[3]
Other comprehensive income (loss):
Comprehensive income	(98)	(83)
Southern California Gas Company [Member] | Net-of-tax amount [Member]
Net income	203	199	[3]
Other comprehensive income (loss):
Comprehensive income	$ 203	$ 199

[1] As adjusted for the adoption of ASU 2016-09 as of January 1, 2016.

[2] As adjusted for the adoption of ASU 2016-09 as of January 1, 2016.

[3] As adjusted for the adoption of ASU 2016-09 as of January 1, 2016.