DERIVATIVE FINANCIAL INSTRUMENTS 3 (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
OtherCurrentAssetsMember
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate and foreign exchange instruments	[1],[2]	$ 7	$ 10
Commodity contracts not subject to rate recovery	[1]	6	25
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Interest rate and foreign exchange instruments	[1]	0	8
Commodity contracts not subject to rate recovery	[1]	166	143
Associated offsetting commodity contracts not subject to rate recovery	[1]	(137)	(129)
Associated cash collateral commodity contracts not subject to rate recovery	[1]	0	(11)
Commodity contracts subject to rate recovery	[1]	7	36
Associated cash collateral commodity contracts subject to rate recovery	[1]	0	0
Associated offsetting commodity contracts subject to rate recovery	[1]	(1)	(3)
Net amount presented on balance sheet	[1]	48	79
Additional margin posted for commodity contracts not subject to rate recovery	[1]	3
Additional margin posted for commodity contracts subject to rate recovery	[1]	15	14
Total	[1],[3]	66	93
OtherCurrentAssetsMember | San Diego Gas and Electric Company [Member]
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate and foreign exchange instruments	[1],[2]	0	0
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Commodity contracts not subject to rate recovery	[1]	0
Associated cash collateral commodity contracts not subject to rate recovery	[1]	0
Commodity contracts subject to rate recovery	[1]	6	32
Associated cash collateral commodity contracts subject to rate recovery	[1]	0	0
Associated offsetting commodity contracts subject to rate recovery	[1]	(1)	0
Net amount presented on balance sheet	[1]	5	32
Additional margin posted for commodity contracts not subject to rate recovery	[1]	1
Additional margin posted for commodity contracts subject to rate recovery	[1]	14	12
Total	[1],[3]	20	44
OtherCurrentAssetsMember | Southern California Gas Company [Member]
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Commodity contracts not subject to rate recovery	[1]	0
Associated cash collateral commodity contracts not subject to rate recovery	[1]	0
Commodity contracts subject to rate recovery	[1]	1	4
Associated offsetting commodity contracts subject to rate recovery	[1]		(3)
Net amount presented on balance sheet	[1]	1	1
Additional margin posted for commodity contracts not subject to rate recovery	[1]	1
Additional margin posted for commodity contracts subject to rate recovery	[1]	1	2
Total	[1]	3	3
OtherNoncurrentAssetsMember
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate and foreign exchange instruments	[2]	0	3
Commodity contracts not subject to rate recovery		0	0
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Interest rate and foreign exchange instruments		0	27
Commodity contracts not subject to rate recovery		31	32
Associated offsetting commodity contracts not subject to rate recovery		(18)	(27)
Associated cash collateral commodity contracts not subject to rate recovery		0	0
Commodity contracts subject to rate recovery		87	76
Associated cash collateral commodity contracts subject to rate recovery		0	0
Associated offsetting commodity contracts subject to rate recovery		(1)	(1)
Net amount presented on balance sheet		99	110
Additional margin posted for commodity contracts not subject to rate recovery		0
Additional margin posted for commodity contracts subject to rate recovery		0	0
Total	[3]	99	110
OtherNoncurrentAssetsMember | San Diego Gas and Electric Company [Member]
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate and foreign exchange instruments	[2]	0	0
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Commodity contracts not subject to rate recovery		0
Associated cash collateral commodity contracts not subject to rate recovery		0
Commodity contracts subject to rate recovery		87	76
Associated cash collateral commodity contracts subject to rate recovery		0	0
Associated offsetting commodity contracts subject to rate recovery		(1)	(1)
Net amount presented on balance sheet		86	75
Additional margin posted for commodity contracts not subject to rate recovery		0
Additional margin posted for commodity contracts subject to rate recovery		0	0
Total	[3]	86	75
OtherNoncurrentAssetsMember | Southern California Gas Company [Member]
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Commodity contracts not subject to rate recovery		0
Associated cash collateral commodity contracts not subject to rate recovery		0
Commodity contracts subject to rate recovery		0	0
Associated offsetting commodity contracts subject to rate recovery			0
Net amount presented on balance sheet		0	0
Additional margin posted for commodity contracts not subject to rate recovery		0
Additional margin posted for commodity contracts subject to rate recovery		0	0
Total		0	0
OtherCurrentLiabilitiesMember
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate and foreign exchange instruments	[2],[4]	(16)	(17)
Commodity contracts not subject to rate recovery	[4]	0	0
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Interest rate and foreign exchange instruments	[4]	(3)	(7)
Commodity contracts not subject to rate recovery	[4]	(147)	(135)
Associated offsetting commodity contracts not subject to rate recovery	[4]	137	129
Associated cash collateral commodity contracts not subject to rate recovery	[4]	3	0
Commodity contracts subject to rate recovery	[4]	(59)	(36)
Associated cash collateral commodity contracts subject to rate recovery	[4]	25	23
Associated offsetting commodity contracts subject to rate recovery	[4]	1	3
Net amount presented on balance sheet	[4]	(59)	(40)
Additional margin posted for commodity contracts not subject to rate recovery	[4]	0
Additional margin posted for commodity contracts subject to rate recovery	[4]	0	0
Total	[3],[4]	(59)	(40)
OtherCurrentLiabilitiesMember | San Diego Gas and Electric Company [Member]
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate and foreign exchange instruments	[2],[4]	(15)	(16)
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Commodity contracts not subject to rate recovery	[4]	(1)
Associated cash collateral commodity contracts not subject to rate recovery	[4]	1
Commodity contracts subject to rate recovery	[4]	(59)	(32)
Associated cash collateral commodity contracts subject to rate recovery	[4]	25	23
Associated offsetting commodity contracts subject to rate recovery	[4]	1	0
Net amount presented on balance sheet	[4]	(48)	(25)
Additional margin posted for commodity contracts not subject to rate recovery	[4]	0
Additional margin posted for commodity contracts subject to rate recovery	[4]	0	0
Total	[3],[4]	(48)	(25)
OtherCurrentLiabilitiesMember | Southern California Gas Company [Member]
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Commodity contracts not subject to rate recovery	[4]	(2)
Associated cash collateral commodity contracts not subject to rate recovery	[4]	2
Commodity contracts subject to rate recovery	[4]	0	(4)
Associated offsetting commodity contracts subject to rate recovery	[4]		3
Net amount presented on balance sheet	[4]	0	(1)
Additional margin posted for commodity contracts not subject to rate recovery	[4]	0
Additional margin posted for commodity contracts subject to rate recovery	[4]	0	0
Total	[4]	0	(1)
OtherNoncurrentLiabilitiesMember
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate and foreign exchange instruments	[2]	(159)	(109)
Commodity contracts not subject to rate recovery		0	0
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Interest rate and foreign exchange instruments		0	(22)
Commodity contracts not subject to rate recovery		(18)	(29)
Associated offsetting commodity contracts not subject to rate recovery		18	27
Associated cash collateral commodity contracts not subject to rate recovery		0	0
Commodity contracts subject to rate recovery		(65)	(20)
Associated cash collateral commodity contracts subject to rate recovery		28	13
Associated offsetting commodity contracts subject to rate recovery		1	1
Net amount presented on balance sheet		(195)	(139)
Additional margin posted for commodity contracts not subject to rate recovery		0
Additional margin posted for commodity contracts subject to rate recovery		0	0
Total	[3]	(195)	(139)
OtherNoncurrentLiabilitiesMember | San Diego Gas and Electric Company [Member]
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate and foreign exchange instruments	[2]	(29)	(31)
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Commodity contracts not subject to rate recovery		0
Associated cash collateral commodity contracts not subject to rate recovery		0
Commodity contracts subject to rate recovery		(65)	(20)
Associated cash collateral commodity contracts subject to rate recovery		28	13
Associated offsetting commodity contracts subject to rate recovery		1	1
Net amount presented on balance sheet		(65)	(37)
Additional margin posted for commodity contracts not subject to rate recovery		0
Additional margin posted for commodity contracts subject to rate recovery		0	0
Total	[3]	(65)	(37)
OtherNoncurrentLiabilitiesMember | Southern California Gas Company [Member]
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Commodity contracts not subject to rate recovery		0
Associated cash collateral commodity contracts not subject to rate recovery		0
Commodity contracts subject to rate recovery		0	0
Associated offsetting commodity contracts subject to rate recovery			0
Net amount presented on balance sheet		0	0
Additional margin posted for commodity contracts not subject to rate recovery		0
Additional margin posted for commodity contracts subject to rate recovery		0	0
Total		$ 0	$ 0

[1] Included in Current Assets: Other for SoCalGas.

[2] Includes Otay Mesa VIE. All of SDG&E’s amounts relate to Otay Mesa VIE.

[3] Normal purchase contracts previously measured at fair value are excluded.

[4] Included in Current Liabilities: Other for SoCalGas.