CALIFORNIA UTILITIES' REGULATORY MATTERS - SCHEDULE OF REGULATORY AMOUNTS 1 (Details) (USD $) In Millions, unless otherwise specified	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]	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]	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			$ 115
General Rate Case, Percentage Annual Revenue Requirement Increase				7.40%			6.20%
General Rate Case, Revenue Requirement				1,733			1,959
General Rate Case, Total Earnings Impact					69			37
General Rate Case, Cumulative Earnings Impact					17	52		12	25
General Rate Case, Regulatory Asset				334			130
General Rate Case, Noncurrent Regulatory Asset				$ 215			$ 78
General Rate Case, Revenue Attrition Mechanism Fixed Annual Factor	2.75%	2.75%	2.65%
FERC Electric Transmission Formula Rate Filing [Line Items]
Authorized Return On Ferc Rate Base				11.35%
Proposed Return On Ferc Rate Base				11.30%