DERIVATIVE NOTIONALS (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Derivative Liability Notional Amount	$ 377	$ 384
Cash Flow Hedges | Cross Currency Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability Notional Amount	$ 408	$ 408
Cash Flow Hedges | Minimum [Member]
Derivatives, Fair Value [Line Items]
Maturities of interest rate derivatives	2016	2016
Cash Flow Hedges | Minimum [Member] | Cross Currency Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Maturities of interest rate derivatives	2018	2018
Cash Flow Hedges | Maximum [Member]
Derivatives, Fair Value [Line Items]
Maturities of interest rate derivatives	2028	2028
Cash Flow Hedges | Maximum [Member] | Cross Currency Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Maturities of interest rate derivatives	2023	2023
Fair Value Hedges
Derivatives, Fair Value [Line Items]
Derivative Liability Notional Amount	$ 0	$ 300
Fair Value Hedges | Maximum [Member]
Derivatives, Fair Value [Line Items]
Maturities of interest rate derivatives	0	2016
Undesignated Derivatives | Foreign Exchange Instrument
Derivatives, Fair Value [Line Items]
Derivative Liability Notional Amount	$ 550	$ 0
Undesignated Derivatives | Maximum [Member] | Foreign Exchange Instrument
Derivatives, Fair Value [Line Items]
Maturities of interest rate derivatives	2016	0
San Diego Gas and Electric Company [Member] | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Derivative Liability Notional Amount	$ 310	$ 315
San Diego Gas and Electric Company [Member] | Cash Flow Hedges | Minimum [Member]
Derivatives, Fair Value [Line Items]
Maturities of interest rate derivatives	2016	2016
San Diego Gas and Electric Company [Member] | Cash Flow Hedges | Maximum [Member]
Derivatives, Fair Value [Line Items]
Maturities of interest rate derivatives	2019	2019