DERIVATIVE FINANCIAL INSTRUMENTS 2 (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Cash Flow Hedges
Schedule Of Notional Amounts Of Interest Rate Derivatives [Line Items]
Derivative Liability Notional Amount	$ 389	$ 399
Cash Flow Hedges | Maximum [Member]
Schedule Of Notional Amounts Of Interest Rate Derivatives [Line Items]
Maturities of interest rate derivatives	2028	2028
Cash Flow Hedges | Minimum [Member]
Schedule Of Notional Amounts Of Interest Rate Derivatives [Line Items]
Maturities of interest rate derivatives	2015	2015
Fair Value Hedges
Schedule Of Notional Amounts Of Interest Rate Derivatives [Line Items]
Derivative Liability Notional Amount	$ 300	$ 300
Fair Value Hedges | Maximum [Member]
Schedule Of Notional Amounts Of Interest Rate Derivatives [Line Items]
Maturities of interest rate derivatives	2016	2016
San Diego Gas and Electric Company [Member] | Cash Flow Hedges
Schedule Of Notional Amounts Of Interest Rate Derivatives [Line Items]
Derivative Liability Notional Amount	$ 317	$ 325
San Diego Gas and Electric Company [Member] | Cash Flow Hedges | Maximum [Member]
Schedule Of Notional Amounts Of Interest Rate Derivatives [Line Items]
Maturities of interest rate derivatives	2019	2019
San Diego Gas and Electric Company [Member] | Cash Flow Hedges | Minimum [Member]
Schedule Of Notional Amounts Of Interest Rate Derivatives [Line Items]
Maturities of interest rate derivatives	2015	2015