CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2017
Net income (loss)	$ (530,000,000)	$ 248,000,000	[1]	$ (172,000,000)	$ 700,000,000	[1],[2]
Other comprehensive income (loss):
Comprehensive (loss) income				(131,000,000)	739,000,000
Preferred dividends of subsidiary	(1,000,000)	(1,000,000)	[1]	(1,000,000)	(1,000,000)	[1]
Mandatory convertible preferred stock dividends	(25,000,000)	0	[1]	(53,000,000)	0	[1]
Pretax amount [Member]
Net income (loss)	(1,118,000,000)	427,000,000		(454,000,000)	1,163,000,000
Other comprehensive income (loss):
Foreign currency translation adjustments	(86,000,000)	3,000,000		(62,000,000)	49,000,000
Financial instruments	35,000,000	(43,000,000)		123,000,000	(36,000,000)
Pension and other postretirement benefits	3,000,000	2,000,000		6,000,000	5,000,000
Total other comprehensive income (loss)	(48,000,000)	(38,000,000)		67,000,000	18,000,000
Comprehensive (loss) income	(1,166,000,000)	389,000,000		(387,000,000)	1,181,000,000
Preferred dividends of subsidiary	(1,000,000)	(1,000,000)		(1,000,000)	(1,000,000)
Comprehensive income (loss)	(1,167,000,000)	388,000,000		(388,000,000)	1,180,000,000
Income tax (expense) benefit [Member]
Net income (loss)	583,000,000	(167,000,000)		294,000,000	(462,000,000)
Other comprehensive income (loss):
Foreign currency translation adjustments	0	0		0	0
Financial instruments	(8,000,000)	17,000,000		(38,000,000)	14,000,000
Pension and other postretirement benefits	0	(1,000,000)		(1,000,000)	(2,000,000)
Total other comprehensive income (loss)	(8,000,000)	16,000,000		(39,000,000)	12,000,000
Comprehensive (loss) income	575,000,000	(151,000,000)		255,000,000	(450,000,000)
Preferred dividends of subsidiary	0	0		0	0
Comprehensive income (loss)	575,000,000	(151,000,000)		255,000,000	(450,000,000)
Net-of-tax amount [Member]
Net income (loss)	(535,000,000)	260,000,000		(160,000,000)	701,000,000
Other comprehensive income (loss):
Foreign currency translation adjustments	(86,000,000)	3,000,000		(62,000,000)	49,000,000
Financial instruments	27,000,000	(26,000,000)		85,000,000	(22,000,000)
Pension and other postretirement benefits	3,000,000	1,000,000		5,000,000	3,000,000
Total other comprehensive income (loss)	(56,000,000)	(22,000,000)		28,000,000	30,000,000
Comprehensive (loss) income	(591,000,000)	238,000,000		(132,000,000)	731,000,000
Preferred dividends of subsidiary	(1,000,000)	(1,000,000)		(1,000,000)	(1,000,000)
Comprehensive income (loss)	(592,000,000)	237,000,000		(133,000,000)	730,000,000
Noncontrolling Interests (after-tax) [Member]
Net income (loss)	5,000,000	(12,000,000)		(12,000,000)	(1,000,000)
Other comprehensive income (loss):
Foreign currency translation adjustments	(8,000,000)	2,000,000		(3,000,000)	11,000,000
Financial instruments	6,000,000	(4,000,000)		16,000,000	(2,000,000)
Pension and other postretirement benefits	0	0		0	0
Total other comprehensive income (loss)	(2,000,000)	(2,000,000)		13,000,000	9,000,000
Comprehensive (loss) income	3,000,000	(14,000,000)		1,000,000	8,000,000
Preferred dividends of subsidiary	0	0		0	0
Comprehensive income (loss)	3,000,000	(14,000,000)		1,000,000	8,000,000
Total [Member]
Net income (loss)	(530,000,000)	248,000,000		(172,000,000)	700,000,000
Other comprehensive income (loss):
Foreign currency translation adjustments	(94,000,000)	5,000,000		(65,000,000)	60,000,000
Financial instruments	33,000,000	(30,000,000)		101,000,000	(24,000,000)
Pension and other postretirement benefits	3,000,000	1,000,000		5,000,000	3,000,000
Total other comprehensive income (loss)	(58,000,000)	(24,000,000)		41,000,000	39,000,000
Comprehensive (loss) income	(588,000,000)	224,000,000		(131,000,000)	739,000,000
Preferred dividends of subsidiary	(1,000,000)	(1,000,000)		(1,000,000)	(1,000,000)
Comprehensive income (loss)	(589,000,000)	223,000,000		(132,000,000)	738,000,000
San Diego Gas and Electric Company [Member]
Net income (loss)	146,000,000	153,000,000	[1]	315,000,000	310,000,000	[1]
Other comprehensive income (loss):
Comprehensive (loss) income				320,000,000	314,000,000
San Diego Gas and Electric Company [Member] | Pretax amount [Member]
Net income (loss)	188,000,000	203,000,000		414,000,000	448,000,000
Other comprehensive income (loss):
Financial instruments	0	0		0	0
Total other comprehensive income (loss)	0	0		0	0
Comprehensive (loss) income	188,000,000	203,000,000		414,000,000	448,000,000
San Diego Gas and Electric Company [Member] | Income tax (expense) benefit [Member]
Net income (loss)	(42,000,000)	(54,000,000)		(98,000,000)	(144,000,000)
Other comprehensive income (loss):
Financial instruments	0	0		0	0
Total other comprehensive income (loss)	0	0		0	0
Comprehensive (loss) income	(42,000,000)	(54,000,000)		(98,000,000)	(144,000,000)
San Diego Gas and Electric Company [Member] | Net-of-tax amount [Member]
Net income (loss)	146,000,000	149,000,000		316,000,000	304,000,000
Other comprehensive income (loss):
Financial instruments	0	0		0	0
Total other comprehensive income (loss)	0	0		0	0
Comprehensive (loss) income	146,000,000	149,000,000		316,000,000	304,000,000
San Diego Gas and Electric Company [Member] | Noncontrolling Interests (after-tax) [Member]
Net income (loss)	0	4,000,000		(1,000,000)	6,000,000
Other comprehensive income (loss):
Financial instruments	1,000,000	1,000,000		5,000,000	4,000,000
Total other comprehensive income (loss)	1,000,000	1,000,000		5,000,000	4,000,000
Comprehensive (loss) income	1,000,000	5,000,000		4,000,000	10,000,000
San Diego Gas and Electric Company [Member] | Total [Member]
Net income (loss)	146,000,000	153,000,000		315,000,000	310,000,000
Other comprehensive income (loss):
Financial instruments	1,000,000	1,000,000		5,000,000	4,000,000
Total other comprehensive income (loss)	1,000,000	1,000,000		5,000,000	4,000,000
Comprehensive (loss) income	147,000,000	154,000,000		320,000,000	314,000,000
Southern California Gas Company [Member]
Net income (loss)	34,000,000	59,000,000	[1]	259,000,000	262,000,000	[1]
Other comprehensive income (loss):
Comprehensive (loss) income				260,000,000	263,000,000
Southern California Gas Company [Member] | Pretax amount [Member]
Net income (loss)	57,000,000	78,000,000		341,000,000	379,000,000
Other comprehensive income (loss):
Pension and other postretirement benefits	1,000,000	1,000,000		1,000,000	1,000,000
Total other comprehensive income (loss)	1,000,000	1,000,000		1,000,000	1,000,000
Comprehensive (loss) income	58,000,000	79,000,000		342,000,000	380,000,000
Southern California Gas Company [Member] | Income tax (expense) benefit [Member]
Net income (loss)	(23,000,000)	(19,000,000)		(82,000,000)	(117,000,000)
Other comprehensive income (loss):
Pension and other postretirement benefits	0	0		0	0
Total other comprehensive income (loss)	0	0		0	0
Comprehensive (loss) income	(23,000,000)	(19,000,000)		(82,000,000)	(117,000,000)
Southern California Gas Company [Member] | Net-of-tax amount [Member]
Net income (loss)	34,000,000	59,000,000		259,000,000	262,000,000
Other comprehensive income (loss):
Pension and other postretirement benefits	1,000,000	1,000,000		1,000,000	1,000,000
Total other comprehensive income (loss)	1,000,000	1,000,000		1,000,000	1,000,000
Comprehensive (loss) income	$ 35,000,000	$ 60,000,000		$ 260,000,000	$ 263,000,000

[1] 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.

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