OTHER FINANCIAL DATA - OTHER INCOME (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Component of Other Income, Nonoperating [Line Items]
AFUDC related to equity		$ 30	$ 31	$ 57	$ 58
Investment gains (losses)	[1]	10	(2)	20	7
Electrical infrastructure relocation income	[2]	2	4	3	4
Gains (losses) on interest rate and foreign exchange instruments, net		(15)	(3)	(12)	(3)
Sale of other investments		1	6	2	6
Foreign currency transaction losses		(5)	(2)	(7)	(3)
Regulatory Interest, net	[3]	1	1	3	2
Sundry, net		(1)	2	6	5
Total		23	37	72	76
San Diego Gas and Electric Company [Member]
Component of Other Income, Nonoperating [Line Items]
AFUDC related to equity		13	10	24	18
Regulatory Interest, net	[3]	1	1	3	2
Sundry, net		(1)	(2)	0	(2)
Total		13	9	27	18
Southern California Gas Company [Member]
Component of Other Income, Nonoperating [Line Items]
AFUDC related to equity		10	10	20	19
Sundry, net		(4)	(1)	(4)	(2)
Total		$ 6	$ 9	$ 16	$ 17

[1] Represents investment gains (losses) on dedicated assets in support of our executive retirement and deferred compensation plans. These amounts are partially offset by corresponding changes in compensation expense related to the plans.

[2] Income at Luz del Sur associated with the relocation of electrical infrastructure.

[3] Interest on regulatory balancing accounts.