DERIVATIVE INSTRUMENTS ON THE CONDENSED BALANCE SHEET (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Other Current Assets [Member]
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate and foreign exchange instruments	[1],[2]	$ 5	$ 4
Commodity contracts not subject to rate recovery	[1]		13
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Interest rate and foreign exchange instruments	[1]	3
Commodity contracts not subject to rate recovery	[1]	144	245
Associated offsetting commodity contracts not subject to rate recovery	[1]	(135)	(232)
Associated cash collateral commodity contracts not subject to rate recovery	[1]	0	(6)
Commodity contracts subject to rate recovery	[1]	23	28
Associated cash collateral commodity contracts subject to rate recovery	[1]	0	0
Associated offsetting commodity contracts subject to rate recovery	[1]	(4)	(2)
Net amount presented on balance sheet	[1]	36	50
Additional margin posted for commodity contracts not subject to rate recovery	[1]	20	2
Additional margin posted for commodity contracts subject to rate recovery	[1]	32	28
Total	[1],[3]	88	80
Other Current Assets [Member] | 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	0
Associated cash collateral commodity contracts not subject to rate recovery	[1]	0	0
Commodity contracts subject to rate recovery	[1]	20	27
Associated cash collateral commodity contracts subject to rate recovery	[1]	0	0
Associated offsetting commodity contracts subject to rate recovery	[1]	(2)	(2)
Net amount presented on balance sheet	[1]	18	25
Additional margin posted for commodity contracts not subject to rate recovery	[1]	2	1
Additional margin posted for commodity contracts subject to rate recovery	[1]	30	27
Total	[1],[3]	50	53
Other Current Assets [Member] | 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	0
Associated cash collateral commodity contracts not subject to rate recovery	[1]	0	0
Commodity contracts subject to rate recovery	[1]	3	1
Associated offsetting commodity contracts subject to rate recovery	[1]	(2)
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]	2	1
Total	[1]	4	2
Other Noncurrent Assets [Member]
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate and foreign exchange instruments	[2]	0	1
Commodity contracts not subject to rate recovery			0
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Interest rate and foreign exchange instruments		0
Commodity contracts not subject to rate recovery		20	32
Associated offsetting commodity contracts not subject to rate recovery		(9)	(20)
Associated cash collateral commodity contracts not subject to rate recovery		0	0
Commodity contracts subject to rate recovery		51	49
Associated cash collateral commodity contracts subject to rate recovery		0	0
Associated offsetting commodity contracts subject to rate recovery		(1)	(2)
Net amount presented on balance sheet		61	60
Additional margin posted for commodity contracts not subject to rate recovery		0	0
Additional margin posted for commodity contracts subject to rate recovery		0	0
Total	[3]	61	60
Other Noncurrent Assets [Member] | 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	0
Associated cash collateral commodity contracts not subject to rate recovery		0	0
Commodity contracts subject to rate recovery		51	49
Associated cash collateral commodity contracts subject to rate recovery		0	0
Associated offsetting commodity contracts subject to rate recovery		(1)	(2)
Net amount presented on balance sheet		50	47
Additional margin posted for commodity contracts not subject to rate recovery		0	0
Additional margin posted for commodity contracts subject to rate recovery		0	0
Total	[3]	50	47
Other Noncurrent Assets [Member] | 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	0
Associated cash collateral commodity contracts not subject to rate recovery		0	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
Other Current Liabilities [Member]
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate and foreign exchange instruments	[2],[4]	(15)	(15)
Commodity contracts not subject to rate recovery	[4]		0
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Interest rate and foreign exchange instruments	[4]	0
Commodity contracts not subject to rate recovery	[4]	(144)	(239)
Associated offsetting commodity contracts not subject to rate recovery	[4]	135	232
Associated cash collateral commodity contracts not subject to rate recovery	[4]	7	4
Commodity contracts subject to rate recovery	[4]	(68)	(61)
Associated cash collateral commodity contracts subject to rate recovery	[4]	31	28
Associated offsetting commodity contracts subject to rate recovery	[4]	4	2
Net amount presented on balance sheet	[4]	(50)	(49)
Additional margin posted for commodity contracts not subject to rate recovery	[4]	0	0
Additional margin posted for commodity contracts subject to rate recovery	[4]	0	0
Total	[3],[4]	(50)	(49)
Other Current Liabilities [Member] | San Diego Gas and Electric Company [Member]
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate and foreign exchange instruments	[2],[4]	(14)	(14)
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Commodity contracts not subject to rate recovery	[4]	(1)	(1)
Associated cash collateral commodity contracts not subject to rate recovery	[4]	1	1
Commodity contracts subject to rate recovery	[4]	(65)	(60)
Associated cash collateral commodity contracts subject to rate recovery	[4]	31	28
Associated offsetting commodity contracts subject to rate recovery	[4]	2	2
Net amount presented on balance sheet	[4]	(46)	(44)
Additional margin posted for commodity contracts not subject to rate recovery	[4]	0	0
Additional margin posted for commodity contracts subject to rate recovery	[4]	0	0
Total	[3],[4]	(46)	(44)
Other Current Liabilities [Member] | 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]	(1)	(1)
Associated cash collateral commodity contracts not subject to rate recovery	[4]	1	1
Commodity contracts subject to rate recovery	[4]	(3)	(1)
Associated offsetting commodity contracts subject to rate recovery	[4]	2
Net amount presented on balance sheet	[4]	(1)	(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]	(1)	(1)
Other Noncurrent Liabilities [Member]
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate and foreign exchange instruments	[2]	(166)	(156)
Commodity contracts not subject to rate recovery			0
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Interest rate and foreign exchange instruments		0
Commodity contracts not subject to rate recovery		(9)	(21)
Associated offsetting commodity contracts not subject to rate recovery		9	20
Associated cash collateral commodity contracts not subject to rate recovery		0	0
Commodity contracts subject to rate recovery		(61)	(64)
Associated cash collateral commodity contracts subject to rate recovery		24	26
Associated offsetting commodity contracts subject to rate recovery		1	2
Net amount presented on balance sheet		(202)	(193)
Additional margin posted for commodity contracts not subject to rate recovery		0	0
Additional margin posted for commodity contracts subject to rate recovery		0	0
Total	[3]	(202)	(193)
Other Noncurrent Liabilities [Member] | San Diego Gas and Electric Company [Member]
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate and foreign exchange instruments	[2]	(25)	(23)
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]
Commodity contracts not subject to rate recovery		0	0
Associated cash collateral commodity contracts not subject to rate recovery		0	0
Commodity contracts subject to rate recovery		(61)	(64)
Associated cash collateral commodity contracts subject to rate recovery		24	26
Associated offsetting commodity contracts subject to rate recovery		1	2
Net amount presented on balance sheet		(61)	(59)
Additional margin posted for commodity contracts not subject to rate recovery		0	0
Additional margin posted for commodity contracts subject to rate recovery		0	0
Total	[3]	(61)	(59)
Other Noncurrent Liabilities [Member] | 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	0
Associated cash collateral commodity contracts not subject to rate recovery		0	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.