NUCLEAR PLANT - INVESTMENT (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Nuclear Plant Investment [Line Items]
Loss From Plant Closure, Pretax	$ 0	$ (21)
Loss (Adjustment) From Plant Closure, After Tax		(13)
Loss from plant closure, after-tax (cumulative)	$ 125
Nuclear Plant, Ownership Percentage	20.00%
San Diego Gas and Electric Company [Member]
Nuclear Plant Investment [Line Items]
Utility plant closure (adjustment) loss	$ 0	(21)
Loss (Adjustment) From Plant Closure, After Tax		$ (13)
Loss from plant closure, after-tax (cumulative)	$ 125
Nuclear Plant, Ownership Percentage	20.00%