CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income	$ 27	$ 320	$ 357	$ 778
Comprehensive income, net of income tax
Preferred dividends of subsidiary	(1)	(1)	(1)	(1)
Before-Tax Amount [Member]
Net income	(89)	394	372	994
Comprehensive income, net of income tax
Foreign currency translation adjustments	11	(43)	79	(105)
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	(78)	95	(237)	6
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	2	2	4	4
Other Comprehensive Income (Loss), Net of Tax, Total	(65)	54	(154)	(95)
Total Comprehensive Income	(154)	448	218	899
Preferred dividends of subsidiary	(1)	(1)	(1)	(1)
Total comprehensive income, after preferred dividends of subsidiaries	(155)	447	217	898
Income Tax (Expense) Benefit [Member]
Net income	106	(98)	(36)	(261)
Comprehensive income, net of income tax
Foreign currency translation adjustments	0	0	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	35	(36)	110	(2)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(1)	(1)	(2)	(2)
Other Comprehensive Income (Loss), Net of Tax, Total	34	(37)	108	(4)
Total Comprehensive Income	140	(135)	72	(265)
Preferred dividends of subsidiary	0	0	0	0
Total comprehensive income, after preferred dividends of subsidiaries	140	(135)	72	(265)
Net-of-Tax Amount [Member]
Net income	17	296	336	733
Comprehensive income, net of income tax
Foreign currency translation adjustments	11	(43)	79	(105)
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	(43)	59	(127)	4
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	1	1	2	2
Other Comprehensive Income (Loss), Net of Tax, Total	(31)	17	(46)	(99)
Total Comprehensive Income	(14)	313	290	634
Preferred dividends of subsidiary	(1)	(1)	(1)	(1)
Total comprehensive income, after preferred dividends of subsidiaries	(15)	312	289	633
Noncontrolling Interests [Member]
Net income	10	24	21	45
Comprehensive income, net of income tax
Foreign currency translation adjustments	0	(5)	5	(13)
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	1	6	(4)	1
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Total	1	1	1	(12)
Total Comprehensive Income	11	25	22	33
Preferred dividends of subsidiary	0	0	0	0
Total comprehensive income, after preferred dividends of subsidiaries	11	25	22	33
Total Equity [Member]
Net income	27	320	357	778
Comprehensive income, net of income tax
Foreign currency translation adjustments	11	(48)	84	(118)
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	(42)	65	(131)	5
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	1	1	2	2
Other Comprehensive Income (Loss), Net of Tax, Total	(30)	18	(45)	(111)
Total Comprehensive Income	(3)	338	312	667
Preferred dividends of subsidiary	(1)	(1)	(1)	(1)
Total comprehensive income, after preferred dividends of subsidiaries	(4)	337	311	666
San Diego Gas and Electric Company [Member]
Net income	87	130	217	281
San Diego Gas and Electric Company [Member] | Before-Tax Amount [Member]
Net income	148	180	349	415
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Total	0	0	0	0
Total Comprehensive Income	148	180	349	415
San Diego Gas and Electric Company [Member] | Income Tax (Expense) Benefit [Member]
Net income	(48)	(54)	(120)	(142)
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Total	0	0	0	0
Total Comprehensive Income	(48)	(54)	(120)	(142)
San Diego Gas and Electric Company [Member] | Net-of-Tax Amount [Member]
Net income	100	126	229	273
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Total	0	0	0	0
Total Comprehensive Income	100	126	229	273
San Diego Gas and Electric Company [Member] | Noncontrolling Interests [Member]
Net income	(13)	4	(12)	8
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	1	3	(1)	1
Other Comprehensive Income (Loss), Net of Tax, Total	1	3	(1)	1
Total Comprehensive Income	(12)	7	(13)	9
San Diego Gas and Electric Company [Member] | Total Equity [Member]
Net income	87	130	217	281
Comprehensive income, net of income tax
Other Comprehensive Income (Loss), Derivatives Qualifying As Hedges, Net of Tax	1	3	(1)	1
Other Comprehensive Income (Loss), Net of Tax, Total	1	3	(1)	1
Total Comprehensive Income	88	133	216	282
Southern California Gas Company [Member]
Net income	0	71	195	285
Southern California Gas Company [Member] | Before-Tax Amount [Member]
Net income	(29)	87	253	396
Comprehensive income, net of income tax
Total Comprehensive Income	(29)	87	253	396
Southern California Gas Company [Member] | Income Tax (Expense) Benefit [Member]
Net income	29	(16)	(58)	(111)
Comprehensive income, net of income tax
Total Comprehensive Income	29	(16)	(58)	(111)
Southern California Gas Company [Member] | Net-of-Tax Amount [Member]
Net income	0	71	195	285
Comprehensive income, net of income tax
Total Comprehensive Income	$ 0	$ 71	$ 195	$ 285