DEBT AND CREDIT FACILITIES 2 (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Sempra Mexico [Member]
Debt Instrument [Line Items]
Debt Proceeds Used For Repayment of Intercompany Debt	$ 357
Other Long Term Debt, Fixed Rate Due 2014 [Member] | Chilquinta Energia [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	306
Retired Debt Instrument, Face Amount	86
Retired Debt Instrument, Interest Rate, Stated Percentage	2.75%
Other Long Term Debt, Fixed Rate Due 2023 [Member] | Sempra Mexico [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.12%
Other Long Term Debt, Floating Rate Due 2018 [Member] | Sempra Mexico [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	102
Debt Instrument, Interest Rate, Stated Percentage	2.66%
Other Long Term Debt, Variable Rate Due May 2023 [Member] | Copper Mountain Solar 2 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate At Period End	2.81%
Other Long Term Debt, Due May 2023 [Member] | Copper Mountain Solar 2 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maximum Borrowing Amount	286
Debt Instrument, Outstanding Borrowings	$ 146
Other Long Term Debt, Floating to Fixed Rate Due May 2023 [Member] | Copper Mountain Solar 2 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, After Floating To Fixed Swap	5.33%