CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016		Jun. 30, 2017	Jun. 30, 2016
Net income (loss)	$ 248,000,000	$ 27,000,000	[1]	$ 700,000,000	$ 391,000,000	[1],[2]
Other comprehensive income (loss):
Comprehensive income (loss)				739,000,000	346,000,000
Pretax amount [Member]
Net income (loss)	427,000,000	(89,000,000)		1,163,000,000	372,000,000	[3]
Other comprehensive income (loss):
Foreign currency translation adjustments	3,000,000	11,000,000		49,000,000	79,000,000	[3]
Financial instruments	(43,000,000)	(78,000,000)		(36,000,000)	(237,000,000)	[3]
Pension and other postretirement benefits	2,000,000	2,000,000		5,000,000	4,000,000	[3]
Total other comprehensive income (loss)	(38,000,000)	(65,000,000)		18,000,000	(154,000,000)	[3]
Comprehensive income (loss)	389,000,000	(154,000,000)		1,181,000,000	218,000,000	[3]
Preferred dividends	(1,000,000)	(1,000,000)		(1,000,000)	(1,000,000)	[3]
Comprehensive income (loss) after preferred dividends of subsidiary	388,000,000	(155,000,000)		1,180,000,000	217,000,000	[3]
Income tax (expense) benefit [Member]
Net income (loss)	(167,000,000)	106,000,000		(462,000,000)	(2,000,000)	[3]
Other comprehensive income (loss):
Foreign currency translation adjustments	0	0		0	0	[3]
Financial instruments	17,000,000	35,000,000		14,000,000	110,000,000	[3]
Pension and other postretirement benefits	(1,000,000)	(1,000,000)		(2,000,000)	(2,000,000)	[3]
Total other comprehensive income (loss)	16,000,000	34,000,000		12,000,000	108,000,000	[3]
Comprehensive income (loss)	(151,000,000)	140,000,000		(450,000,000)	106,000,000	[3]
Preferred dividends	0	0		0	0	[3]
Comprehensive income (loss) after preferred dividends of subsidiary	(151,000,000)	140,000,000		(450,000,000)	106,000,000	[3]
Net-of-tax amount [Member]
Net income (loss)	260,000,000	17,000,000		701,000,000	370,000,000	[3]
Other comprehensive income (loss):
Foreign currency translation adjustments	3,000,000	11,000,000		49,000,000	79,000,000	[3]
Financial instruments	(26,000,000)	(43,000,000)		(22,000,000)	(127,000,000)	[3]
Pension and other postretirement benefits	1,000,000	1,000,000		3,000,000	2,000,000	[3]
Total other comprehensive income (loss)	(22,000,000)	(31,000,000)		30,000,000	(46,000,000)	[3]
Comprehensive income (loss)	238,000,000	(14,000,000)		731,000,000	324,000,000	[3]
Preferred dividends	(1,000,000)	(1,000,000)		(1,000,000)	(1,000,000)	[3]
Comprehensive income (loss) after preferred dividends of subsidiary	237,000,000	(15,000,000)		730,000,000	323,000,000	[3]
Noncontrolling Interests (after-tax) [Member]
Net income (loss)	(12,000,000)	10,000,000		(1,000,000)	21,000,000	[3]
Other comprehensive income (loss):
Foreign currency translation adjustments	2,000,000	0		11,000,000	5,000,000	[3]
Financial instruments	(4,000,000)	1,000,000		(2,000,000)	(4,000,000)	[3]
Pension and other postretirement benefits	0	0		0	0	[3]
Total other comprehensive income (loss)	(2,000,000)	1,000,000		9,000,000	1,000,000	[3]
Comprehensive income (loss)	(14,000,000)	11,000,000		8,000,000	22,000,000	[3]
Preferred dividends	0	0		0	0	[3]
Comprehensive income (loss) after preferred dividends of subsidiary	(14,000,000)	11,000,000		8,000,000	22,000,000	[3]
Total [Member]
Net income (loss)	248,000,000	27,000,000		700,000,000	391,000,000	[3]
Other comprehensive income (loss):
Foreign currency translation adjustments	5,000,000	11,000,000		60,000,000	84,000,000	[3]
Financial instruments	(30,000,000)	(42,000,000)		(24,000,000)	(131,000,000)	[3]
Pension and other postretirement benefits	1,000,000	1,000,000		3,000,000	2,000,000	[3]
Total other comprehensive income (loss)	(24,000,000)	(30,000,000)		39,000,000	(45,000,000)	[3]
Comprehensive income (loss)	224,000,000	(3,000,000)		739,000,000	346,000,000	[3]
Preferred dividends	(1,000,000)	(1,000,000)		(1,000,000)	(1,000,000)	[3]
Comprehensive income (loss) after preferred dividends of subsidiary	223,000,000	(4,000,000)		738,000,000	345,000,000	[3]
San Diego Gas and Electric Company [Member]
Net income (loss)	153,000,000	87,000,000		310,000,000	224,000,000	[1]
Other comprehensive income (loss):
Comprehensive income (loss)				314,000,000	223,000,000
San Diego Gas and Electric Company [Member] | Pretax amount [Member]
Net income (loss)	203,000,000	148,000,000		448,000,000	349,000,000	[3]
Other comprehensive income (loss):
Financial instruments	0	0		0	0	[3]
Total other comprehensive income (loss)	0	0		0	0	[3]
Comprehensive income (loss)	203,000,000	148,000,000		448,000,000	349,000,000	[3]
San Diego Gas and Electric Company [Member] | Income tax (expense) benefit [Member]
Net income (loss)	(54,000,000)	(48,000,000)		(144,000,000)	(113,000,000)	[3]
Other comprehensive income (loss):
Financial instruments	0	0		0	0	[3]
Total other comprehensive income (loss)	0	0		0	0	[3]
Comprehensive income (loss)	(54,000,000)	(48,000,000)		(144,000,000)	(113,000,000)	[3]
San Diego Gas and Electric Company [Member] | Net-of-tax amount [Member]
Net income (loss)	149,000,000	100,000,000		304,000,000	236,000,000	[3]
Other comprehensive income (loss):
Financial instruments	0	0		0	0	[3]
Total other comprehensive income (loss)	0	0		0	0	[3]
Comprehensive income (loss)	149,000,000	100,000,000		304,000,000	236,000,000	[3]
San Diego Gas and Electric Company [Member] | Noncontrolling Interests (after-tax) [Member]
Net income (loss)	4,000,000	(13,000,000)		6,000,000	(12,000,000)	[3]
Other comprehensive income (loss):
Financial instruments	1,000,000	1,000,000		4,000,000	(1,000,000)	[3]
Total other comprehensive income (loss)	1,000,000	1,000,000		4,000,000	(1,000,000)	[3]
Comprehensive income (loss)	5,000,000	(12,000,000)		10,000,000	(13,000,000)	[3]
San Diego Gas and Electric Company [Member] | Total [Member]
Net income (loss)	153,000,000	87,000,000		310,000,000	224,000,000	[3]
Other comprehensive income (loss):
Financial instruments	1,000,000	1,000,000		4,000,000	(1,000,000)	[3]
Total other comprehensive income (loss)	1,000,000	1,000,000		4,000,000	(1,000,000)	[3]
Comprehensive income (loss)	154,000,000	88,000,000		314,000,000	223,000,000	[3]
Southern California Gas Company [Member]
Net income (loss)	59,000,000	0		262,000,000	199,000,000	[2]
Other comprehensive income (loss):
Comprehensive income (loss)				263,000,000	199,000,000
Southern California Gas Company [Member] | Pretax amount [Member]
Net income (loss)	78,000,000	(29,000,000)		379,000,000	253,000,000	[3]
Other comprehensive income (loss):
Financial instruments	1,000,000			1,000,000
Total other comprehensive income (loss)	1,000,000			1,000,000
Comprehensive income (loss)	79,000,000	(29,000,000)		380,000,000	253,000,000	[3]
Southern California Gas Company [Member] | Income tax (expense) benefit [Member]
Net income (loss)	(19,000,000)	29,000,000		(117,000,000)	(54,000,000)	[3]
Other comprehensive income (loss):
Financial instruments	0			0
Total other comprehensive income (loss)	0			0
Comprehensive income (loss)	(19,000,000)	29,000,000		(117,000,000)	(54,000,000)	[3]
Southern California Gas Company [Member] | Net-of-tax amount [Member]
Net income (loss)	59,000,000	0		262,000,000	199,000,000	[3]
Other comprehensive income (loss):
Financial instruments	1,000,000			1,000,000
Total other comprehensive income (loss)	1,000,000			1,000,000
Comprehensive income (loss)	$ 60,000,000	$ 0		$ 263,000,000	$ 199,000,000	[3]

[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.