NUCLEAR PLANT - INVESTMENT (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		18 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016
Nuclear Plant Investment [Line Items]
Loss From Plant Closure, Pretax	$ 0	$ 0		$ 0	$ (21)
Loss (Adjustment) From Plant Closure, After Tax			$ (13)
Loss from plant closure, after-tax (cumulative)						$ 125
Nuclear Plant, Ownership Percentage	20.00%			20.00%		20.00%
San Diego Gas and Electric Company [Member]
Nuclear Plant Investment [Line Items]
Utility plant closure adjustment	$ 0	$ 0		$ 0	$ (21)
Loss (Adjustment) From Plant Closure, After Tax			$ (13)
Loss from plant closure, after-tax (cumulative)						$ 125
Nuclear Plant, Ownership Percentage	20.00%			20.00%		20.00%