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INVESTMENTS IN UNCONSOLIDATED ENTITIES - NARRATIVE (Details) $ in Millions		1 Months Ended		10 Months Ended	12 Months Ended
	Nov. 15, 2017	Sep. 30, 2018 USD ($)	Feb. 28, 2017 USD ($)	Dec. 31, 2018 USD ($) MT Bcf	Dec. 31, 2018 USD ($) MT Bcf	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 09, 2018	Nov. 14, 2017	Sep. 26, 2016	Sep. 25, 2016	May 31, 2016	May 09, 2016	Mar. 31, 2016 USD ($)	Mar. 29, 2016	Jun. 30, 2015 USD ($)	Nov. 30, 2014 USD ($)	Oct. 01, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Undistributed earnings of equity method investments				$ 332	$ 332	$ 89
Undistributed earnings, equity method investments, over 50 percent owned					221
Debt instrument converted					0	19	$ 0
Equity method investment				9,652	9,652	0
Interest costs capitalized					202	$ 256	236
Fair value at origin guarantee obligation associated with cash flow requirements																		$ 82
Current guarantor obligations				$ 9	$ 9
R B S Sempra Commodities [Member]
Schedule of Equity Method Investments [Line Items]
Other than temporary impairment		$ 65
Cameron LNG [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee				50.20%	50.20%
Threshold for canceling of hedge, Percent of unamortized principal					50.00%
Indirect economic and beneficial and ownership interest prior to financial completion				37.65%	37.65%
Indirect economic and beneficial and ownership interest after financial completion				10.00%	10.00%
Cameron LNG [Member] \| Other Long Term Debt, Due July 2030 [Member]
Schedule of Equity Method Investments [Line Items]
Guarantor Obligations, Maximum Exposure, Percentage				50.20%	50.20%
Debt instrument, maximum borrowing amount				$ 3,900	$ 3,900
Sempra Energy and Other [Member] \| R B S Sempra Commodities [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee				49.00%	49.00%	49.00%
Sempra Mexico [Member] \| IEnova Pipelines [Member]
Schedule of Equity Method Investments [Line Items]
Acquired percentage interest										50.00%
Ownership percentage in equity method investee											50.00%
Sempra Mexico [Member] \| IMG [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments					$ 80	$ 72	100
Ownership percentage in equity method investee				40.00%	40.00%
Transportation service contract term					25 years
Sempra Mexico [Member] \| TransCanada [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee				60.00%	60.00%
Sempra Mexico [Member] \| DEN [Member] \| IEnova Pipelines [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee										50.00%
Sempra Renewables [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments					$ 5		18
Sempra Renewables [Member] \| Wind Investments [Member]
Schedule of Equity Method Investments [Line Items]
Other than temporary impairment					200
Equity method investment				$ 291	291
Sempra LNG & Midstream [Member] \| Rockies Express [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee												25.00%	25.00%	25.00%	25.00%
Equity method investment														$ 484
Sempra LNG & Midstream [Member] \| Cameron LNG [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments					$ 228	1
Proved developed reserves \| Bcf				1.5	1.5
Project capacity \| MT				13.9	13.9
Proved undeveloped reserve \| MT				12	12
Proved undeveloped reserve per day \| Bcf				1.7	1.7
Interest costs capitalized					$ 47	47	$ 47
Debt amount				$ 7,400	$ 7,400
Percentage of debt hedged by interest rate derivatives				50.00%	50.00%
Notional amount of derivatives																$ 1,500	$ 3,700
Sempra LNG & Midstream [Member] \| LIBOR [Member] \| Cameron LNG [Member]
Schedule of Equity Method Investments [Line Items]
Weighted average rate prior to project completion				1.59%	1.59%
Weighted average rate after project completion				1.78%	1.78%
Fixed percentage interest rate																3.32%	3.19%
Corporate Joint Venture [Member] \| Sempra South American Utilities [Member] \| Eletrans [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments						$ 1
Debt instrument converted			$ 19
Other Project Partners [Member] \| Cameron LNG [Member] \| Other Long Term Debt, Due July 2030 [Member]
Schedule of Equity Method Investments [Line Items]
Guarantor Obligations, Maximum Exposure, Percentage				49.80%	49.80%
Ductos Energéticos del Norte [Member] \| Sempra Mexico [Member] \| IEnova [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in consolidated entity	100.00%
Acquired percentage interest	50.00%
Ownership percentage in equity method investee									50.00%
Oncor Holdings Electric Delivery Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Acquired percentage interest								80.25%
Net income/earnings				$ 371
Payments to acquire equity method investments					$ 230
Oncor Electric Delivery Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Acquired percentage interest								80.25%
Oncor Electric Delivery Company LLC [Member] \| Sempra Texas Holdings Corp [Member]
Schedule of Equity Method Investments [Line Items]
Acquired percentage interest								80.03%