NUCLEAR PLANT 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended						3 Months Ended		6 Months Ended	12 Months Ended	24 Months Ended				3 Months Ended	7 Months Ended	18 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013		Mar. 31, 2014 To SDGE [Member]	Mar. 31, 2014 To Ratepayers [Member]	Mar. 31, 2014 San Diego Gas and Electric Company and Subsidiary [Member]	Mar. 31, 2013 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]	Mar. 31, 2014 Nuclear Plant, SDGE [Member]	Dec. 31, 2013 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																$ 79	$ 165
Authorized Annual Recovery Amount, Nuclear Decommissioning Trust Funding															8
Requested Annual Recovery Amount, Nuclear Decommissioning Trust Funding															16
Nuclear decommissioning trusts	1,055		1,034	[1]			1,055					1,034	[1]
Nuclear Plant Investment [Line Items]
Regulatory Asset, Nuclear Plant Closure							255
Adjustment to utility loss from plant closure, Pretax							(13)	0
Adjustment to loss From Plant Closure, Pretax	(13)	0
Adjustment To Loss From Plant Closure, After Tax							9
Loss From Plant Closure, Pretax (cumulative)							187		200
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
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.