CALIFORNIA UTILITIES' REGULATORY MATTERS - SCHEDULE OF GENERAL RATE CASE DECISION IMPACT ON EARNINGS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2016
Southern California Gas Company [Member]
Public Utilities, General Disclosures [Line Items]
Retroactive revenue requirement increase for the first quarter of 2016. Pretax		$ 20
Retroactive revenue requirement increase for the first quarter of 2016, After-tax		12
Adjustments to revenue related to tax repairs deductions:
2015 memorandum account, Pretax		(72)
True-up of 2012-2014 estimates to actuals, Pretax		(11)
Total, Pretax	$ 4	(83)	$ 19
2015 memorandum account, After-tax		(43)
True-up of 2012-2014 estimates to actuals, After-tax		(6)
Total, After-tax	$ 2	(49)	$ 11
San Diego Gas and Electric Company [Member]
Public Utilities, General Disclosures [Line Items]
Retroactive revenue requirement increase for the first quarter of 2016. Pretax		15
Retroactive revenue requirement increase for the first quarter of 2016, After-tax		9
Adjustments to revenue related to tax repairs deductions:
2015 memorandum account, Pretax		(37)
True-up of 2012-2014 estimates to actuals, Pretax		(15)
Total, Pretax		(52)
2015 memorandum account, After-tax		(22)
True-up of 2012-2014 estimates to actuals, After-tax		(9)
Total, After-tax		$ (31)