OTHER FINANCIAL DATA - AFFILIATES REVENUE AND COST OF SALES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Transactions With Affiliates Disclosure [Line Items]
Revenue from related parties	$ 5	$ 8	$ 10	$ 16
Costs and Expenses Related Party	20	30	50	49
S D G E Segment [Member]
Transactions With Affiliates Disclosure [Line Items]
Revenue from related parties	0	2	3	5
Costs and Expenses Related Party	16	13	30	18
So Cal Gas Segment [Member]
Transactions With Affiliates Disclosure [Line Items]
Revenue from related parties	$ 18	$ 17	$ 35	$ 36