CALIFORNIA UTILITIES' REGULATORY MATTERS - SCHEDULE OF REGULATORY AMOUNTS 1 (Details) (USD $)	12 Months Ended			3 Months Ended				3 Months Ended
	Dec. 31, 2015 Utility Subsidiaries [Member]	Dec. 31, 2014 Utility Subsidiaries [Member]	Dec. 31, 2013 Utility Subsidiaries [Member]	Sep. 30, 2013 San Diego Gas and Electric Company and Subsidiary [Member]	Jun. 30, 2013 San Diego Gas and Electric Company and Subsidiary [Member]	Mar. 31, 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 Southern California Gas Company [Member]	Jun. 30, 2013 Southern California Gas Company [Member]	Mar. 31, 2013 Southern California Gas Company [Member]	Dec. 31, 2012 Southern California Gas Company [Member]
Schedule of Cost of Capital [Line Items]
Authorized Return On Rate Base Previous				8.40%				8.68%
Authorized Return On Rate Base				7.79%				8.02%
General Rate Case [Line Items]
General Rate Case, Annual Revenue Requirement Increase				$ 119,000,000				$ 115,000,000
General Rate Case, Percentage Annual Revenue Requirement Increase				7.40%				6.20%
General Rate Case, Revenue Requirement				1,733,000,000				1,959,000,000
General Rate Case, Total Earnings Impact					69,000,000				37,000,000
General Rate Case, Cumulative Earnings Impact						17,000,000	52,000,000			12,000,000	25,000,000
General Rate Case, Regulatory Asset				366,000,000				117,000,000
General Rate Case, Noncurrent Regulatory Asset				203,000,000				65,000,000
General Rate Case, Revenue Attrition Mechanism Fixed Annual Factor	2.75%	2.75%	2.65%
FERC Electric Transmission Formula Rate Filing [Line Items]
Proposed Return On Ferc Rate Base				11.30%
Likely Return On Ferc Rate Base				10.00%
Proposed Recovery Related To Excess Wildfire Claims In Transmission Rates				$ 23,200,000
Opposition Proposed Ferc Rate Base, Lower Range				8.00%
Opposition Proposed Ferc Rate Base, Upper Range				10.00%