NUCLEAR PLANT 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended						3 Months Ended		6 Months Ended		12 Months Ended	24 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013		Jun. 30, 2014 To SDGE [Member]	Jun. 30, 2014 To Ratepayers [Member]	Jun. 30, 2014 San Diego Gas and Electric Company and Subsidiary [Member]	Jun. 30, 2013 San Diego Gas and Electric Company and Subsidiary [Member]	Jun. 30, 2014 San Diego Gas and Electric Company and Subsidiary [Member]	Jun. 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]	Jun. 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	1,096		1,096		1,034	[1]			1,096		1,096				1,034	[1]
Nuclear Plant Investment [Line Items]
Regulatory Asset, Nuclear Plant Closure									232		232
Utility plant closure (adjustment) loss									0	200	(13)	200
Plant closure (adjustment) loss	0	200	(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							17.50%	82.50%
Nuclear Plant, Lawsuit Recovery Allocation First $25 Million							85.00%	15.00%
Nuclear Plant, Lawsuit Recovery Allocation $26 Million To $225 Million							66.67%	33.33%
Nuclear Plant, Lawsuit Recovery Allocation Over $225 Million							25.00%	75.00%
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%

[1] Derived from audited financial statements.