CALIFORNIA UTILITIES' REGULATORY MATTERS - NUCLEAR PLANT (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended				3 Months Ended	21 Months Ended			3 Months Ended	18 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012		Sep. 30, 2013 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]		Sep. 30, 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												$ 166
Nuclear Plant, Revenue Recognized Associated with SONGS												300
Nuclear Plant, Replacement Power Costs Authorized											93
Authorized Recovery Amount, Nuclear Decommissioning Trust Funding											8
Requested Recovery Amount, Nuclear Decommissioning Trust Funding											16
Nuclear decommissioning trusts	981		981		908	[1]	981	981	908	[1]
Nuclear Plant Investment [Line Items]
Nuclear Plant, Net Property, Plant and Equipment							516	516
Nuclear Plant, Materials Inventory							10	10
Loss From Plant Closure	0	0	200	0
Nuclear Plant, Replacement Power Costs In Excess Of Authorized							74
Regulatory Asset, Nuclear Plant Closure							431	431
Nuclear Plant, Miscellaneous Costs								31
Nuclear Plant, Operations And Maintenance Expenses								$ 220

[1] Derived from audited financial statements.