NUCLEAR PLANT 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended						3 Months Ended		9 Months Ended		12 Months Ended	24 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013		Sep. 30, 2014 To SDGE [Member]	Sep. 30, 2014 To Ratepayers [Member]	Sep. 30, 2014 San Diego Gas and Electric Company and Subsidiary [Member]	Sep. 30, 2013 San Diego Gas and Electric Company and Subsidiary [Member]	Sep. 30, 2014 San Diego Gas and Electric Company and Subsidiary [Member]	Sep. 30, 2013 San Diego Gas and Electric Company and Subsidiary [Member]	Dec. 31, 2012 San Diego Gas and Electric Company and Subsidiary [Member]	Dec. 31, 2014 San Diego Gas and Electric Company and Subsidiary [Member]	Dec. 31, 2013 San Diego Gas and Electric Company and Subsidiary [Member]		Feb. 01, 2012 San Diego Gas and Electric Company and Subsidiary [Member]	Sep. 30, 2014 Nuclear Plant, SDGE [Member]	Jun. 06, 2013 Nuclear Plant, SDGE [Member]
Nuclear Plant [Line Items]
Nuclear Plant, Ownership Percentage																		20.00%
Nuclear Plant, Replacement Power Costs																			$ 165
Authorized Annual Recovery Amount, Nuclear Decommissioning Trust Funding																		8
Requested Annual Recovery Amount, Nuclear Decommissioning Trust Funding																		16
Nuclear decommissioning trusts	1,087		1,087		1,034	[1]			1,087		1,087				1,034	[1]
Nuclear Plant Investment [Line Items]
Regulatory Asset, Nuclear Plant Closure									192		192
Utility plant closure (adjustment) loss									0	0	(13)	200
Plant closure (adjustment) loss	0	0	(13)	200
Total Loss From Plant Closure After Adjustment For Settlement, Pretax											187
Adjustment To Loss From Plant Closure, After Tax											9
Loss from plant closure, after-tax (cumulative)											128	119
Nuclear Plant, Return On Ratebase													2.75%	2.35%
Charge To Reduce Certain Tax Regulatory Assets Attributable To Nuclear Plant			17								17
Nuclear Plant, Net Book Investment, Steam Generator Replacement																	160
Nuclear Plant, Settlement Agreement [Line Items]
Nuclear Plant, Insurance Recovery Allocation Other Policies							17.50%	82.50%
Nuclear Plant, Insurance Recovery Allocation Accidental Outage Policy							5.00%	95.00%
Proportionate Share Of Proceeds From Sale of Materials, Supplies, Fuel Retained							5.00%
Proportionate Share Of Excess Of Cancelled Contract Obligations Over Cancellation Costs Recovered							5.00%
Nuclear Plant, Lawsuit Recovery Allocation							50.00%	50.00%
Other Commitments [Line Items]
Five-year research funding commitment, annual amount									$ 1		$ 1

[1] Derived from audited financial statements.