CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net income (loss)	$ 358	$ 452	[1],[2]
Other comprehensive income (loss):
Comprehensive income (loss)	457	515
Mandatory convertible preferred stock dividends	(28)	0	[2]
Pretax amount [Member]
Net income (loss)	664	736
Other comprehensive income (loss):
Foreign currency translation adjustments	24	46
Financial instruments	88	7
Pension and other postretirement benefits	3	3
Total other comprehensive income (loss)	115	56
Comprehensive income (loss)	779	792
Mandatory convertible preferred stock dividends	(28)
Comprehensive income (loss)	751
Income tax (expense) benefit [Member]
Net income (loss)	(289)	(295)
Other comprehensive income (loss):
Foreign currency translation adjustments	0	0
Financial instruments	(30)	(3)
Pension and other postretirement benefits	(1)	(1)
Total other comprehensive income (loss)	(31)	(4)
Comprehensive income (loss)	(320)	(299)
Mandatory convertible preferred stock dividends	0
Comprehensive income (loss)	(320)
Net-of-tax amount [Member]
Net income (loss)	375	441
Other comprehensive income (loss):
Foreign currency translation adjustments	24	46
Financial instruments	58	4
Pension and other postretirement benefits	2	2
Total other comprehensive income (loss)	84	52
Comprehensive income (loss)	459	493
Mandatory convertible preferred stock dividends	(28)
Comprehensive income (loss)	431
Noncontrolling Interests (after-tax) [Member]
Net income (loss)	(17)	11
Other comprehensive income (loss):
Foreign currency translation adjustments	5	9
Financial instruments	10	2
Pension and other postretirement benefits	0	0
Total other comprehensive income (loss)	15	11
Comprehensive income (loss)	(2)	22
Mandatory convertible preferred stock dividends	0
Comprehensive income (loss)	(2)
Total [Member]
Net income (loss)	358	452
Other comprehensive income (loss):
Foreign currency translation adjustments	29	55
Financial instruments	68	6
Pension and other postretirement benefits	2	2
Total other comprehensive income (loss)	99	63
Comprehensive income (loss)	457	515
Mandatory convertible preferred stock dividends	(28)
Comprehensive income (loss)	429
San Diego Gas and Electric Company [Member]
Net income (loss)	169	157	[1],[2]
Other comprehensive income (loss):
Comprehensive income (loss)	173	160
San Diego Gas and Electric Company [Member] | Pretax amount [Member]
Net income (loss)	226	245
Other comprehensive income (loss):
Financial instruments	0	0
Total other comprehensive income (loss)	0	0
Comprehensive income (loss)	226	245
San Diego Gas and Electric Company [Member] | Income tax (expense) benefit [Member]
Net income (loss)	(56)	(90)
Other comprehensive income (loss):
Financial instruments	0	0
Total other comprehensive income (loss)	0	0
Comprehensive income (loss)	(56)	(90)
San Diego Gas and Electric Company [Member] | Net-of-tax amount [Member]
Net income (loss)	170	155
Other comprehensive income (loss):
Financial instruments	0	0
Total other comprehensive income (loss)	0	0
Comprehensive income (loss)	170	155
San Diego Gas and Electric Company [Member] | Noncontrolling Interests (after-tax) [Member]
Net income (loss)	(1)	2
Other comprehensive income (loss):
Financial instruments	4	3
Total other comprehensive income (loss)	4	3
Comprehensive income (loss)	3	5
San Diego Gas and Electric Company [Member] | Total [Member]
Net income (loss)	169	157
Other comprehensive income (loss):
Financial instruments	4	3
Total other comprehensive income (loss)	4	3
Comprehensive income (loss)	173	160
Southern California Gas Company [Member]
Net income (loss)	225	203	[1]
Other comprehensive income (loss):
Comprehensive income (loss)	225	203
Southern California Gas Company [Member] | Pretax amount [Member]
Net income (loss)	284	301
Other comprehensive income (loss):
Comprehensive income (loss)	284	301
Southern California Gas Company [Member] | Income tax (expense) benefit [Member]
Net income (loss)	(59)	(98)
Other comprehensive income (loss):
Comprehensive income (loss)	(59)	(98)
Southern California Gas Company [Member] | Net-of-tax amount [Member]
Net income (loss)	225	203
Other comprehensive income (loss):
Comprehensive income (loss)	$ 225	$ 203

[1] As adjusted for the retrospective adoption of ASU 2016-18, which we discuss in Note 2.

[2] As adjusted for the retrospective adoption of ASU 2017-07, which we discuss in Note 2, and a reclassification to conform to current year presentation, which we discuss in Note 1.