NUCLEAR PLANT 1 (Details) - USD ($) $ in Millions	3 Months Ended						6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014		Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Nuclear Plant [Line Items]
Authorized Annual Recovery Amount, Nuclear Decommissioning Trust Funding	$ 55						$ 55
Nuclear decommissioning trusts	1,145		$ 1,131	[1]			1,145
Withdrawal From Nuclear Decommissioning Trust Funds	37
Amount funded to customers through Energy Resource Recovery Account	34
Amount Pending IRS Clarification	18
Amount To Refund Regulatory Assets	3
Nuclear Plant Investment [Line Items]
Plant closure (adjustment) loss	0				$ 0		(21)	$ (13)
Loss (Adjustment) From Plant Closure, After Tax		$ (13)	12			$ 9
Loss from plant closure, after-tax (cumulative)	127								$ 119
Charge To Reduce Certain Tax Regulatory Assets Attributable To Nuclear Plant								17
Regulatory Asset, Current, Nuclear Plant Closure	41						41
Regulatory Asset, Nuclear Plant Closure	284						284
Regulatory Asset, Noncurrent, Nuclear Plant Closure	243						243
Other Commitments [Line Items]
Five-year research funding commitment, annual amount	$ 1						$ 1
Nuclear Plant, SDGE [Member]
Nuclear Plant [Line Items]
Nuclear Plant, Ownership Percentage	20.00%						20.00%
Authorized Annual Recovery Amount, Nuclear Decommissioning Trust Funding	$ 55						$ 55
Withdrawal From Nuclear Decommissioning Trust Funds	37
Amount funded to customers through Energy Resource Recovery Account	34
Amount Pending IRS Clarification	18
Amount To Refund Regulatory Assets	3
San Diego Gas and Electric Company [Member]
Nuclear Plant [Line Items]
Nuclear decommissioning trusts	1,145		1,131	[1]			1,145
Nuclear Plant Investment [Line Items]
Utility plant closure (adjustment) loss	0				$ 0		(21)	(13)
Loss (Adjustment) From Plant Closure, After Tax		$ (13)	$ 12			$ 9
Loss from plant closure, after-tax (cumulative)	127								$ 119
Charge To Reduce Certain Tax Regulatory Assets Attributable To Nuclear Plant								$ 17
Regulatory Asset, Current, Nuclear Plant Closure	41						41
Regulatory Asset, Nuclear Plant Closure	284						284
Regulatory Asset, Noncurrent, Nuclear Plant Closure	243						243
Other Commitments [Line Items]
Five-year research funding commitment, annual amount	$ 1						$ 1

[1] Derived from audited financial statements.