DERIVATIVE FINANCIAL INSTRUMENTS - DERIVATIVE COMMODITY VOLUMES (Details) MWh in Millions, MMBTU in Millions	Sep. 30, 2016 MWh MMBTU	Dec. 31, 2015 MWh MMBTU
SDG&E [Member]
Derivatives, Fair Value [Line Items]
Natural gas	56	70
Electricity | MWh	4	1
Congestion revenue rights | MWh	46	36
SoCalGas [Member]
Derivatives, Fair Value [Line Items]
Natural gas	2	1
Sempra Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Natural gas	35	43