INVESTMENTS IN UNCONSOLIDATED ENTITIES - NARRATIVE (Details) $ in Millions				1 Months Ended		9 Months Ended	12 Months Ended
	May 16, 2019 USD ($)	Mar. 09, 2018	Nov. 15, 2017	Dec. 31, 2019 USD ($) MT Bcf	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) MT Bcf	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Nov. 14, 2017	Jun. 30, 2015 USD ($)	Nov. 30, 2014 USD ($)	Oct. 01, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Undistributed earnings of equity method investments				$ 634			$ 634	$ 332
Undistributed earnings, equity method investments, over 50 percent owned				501			501
Interest costs capitalized							183	$ 193	$ 247
Fair value at origin guarantee obligation associated with cash flow requirements				3			3						$ 82
Oncor Electric Delivery Holdings Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Cash contributed to fund the acquisition				$ 1,067			$ 1,067
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]
Maximum exposure percentage				50.20%			50.20%
Debt instrument, maximum borrowing amount				$ 4,000			$ 4,000
Maximum exposure, remaining percentage				49.80%			49.80%
Sempra Texas Intermediate Holding Company LLC [Member] | Oncor Electric Delivery Holdings Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee				100.00%			100.00%	100.00%
Sempra Mexico [Member] | IMG [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments								$ 80	72
Ownership percentage in equity method investee				40.00%			40.00%
Transportation service contract term							35 years
Sempra Renewables [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments								5
Sempra Renewables [Member] | Wind Investments [Member]
Schedule of Equity Method Investments [Line Items]
Other than temporary impairment								200
Sempra LNG [Member] | Cameron LNG [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments							$ 77	228	1
Ownership percentage in equity method investee				50.20%			50.20%
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							$ 33	47	$ 47
Debt amount				$ 7,400			$ 7,400
Debt instrument converted				$ 3,000
Fixed percentage interest rate				3.39%			3.39%
Term of contract							15 years 4 months 24 days
Percentage of debt hedged by interest rate derivatives				50.00%			50.00%
Notional amount of derivatives											$ 1,500	$ 3,700
Derivative amount terminated				$ 790
Effective fixed rate (as a percent)				3.26%
Weighted-average all-in cost of loans outstanding (as a percent)				3.72%
Sempra LNG [Member] | LIBOR [Member] | Cameron LNG [Member]
Schedule of Equity Method Investments [Line Items]
Fixed percentage interest rate											3.32%	3.19%
Weighted average rate prior to project completion				0.98%			0.98%
Weighted average rate after project completion				1.22%			1.22%
Sharyland Holdings, LP [Member]
Schedule of Equity Method Investments [Line Items]
Acquired percentage interest	50.00%
Payments to acquire equity method investments	$ 95						$ 3
Post-closing adjustments	$ 7
Sharyland Holdings, LP [Member] | Sharyland Utilities [Member]
Schedule of Equity Method Investments [Line Items]
Acquired percentage interest	100.00%
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 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%
Oncor Electric Delivery Holdings Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments							1,587	230
Oncor Electric Delivery Holdings Company LLC [Member] | Sempra Texas Holdings Corp [Member] | Sempra Texas Intermediate Holding Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in consolidated entity		100.00%
Sempra Energy [Member] | Oncor Electric Delivery Holdings Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Dividends						$ 246		149
Payments from tax sharing arrangements							$ 10	$ 18
Ramones Norte Pipeline [Member] | Ductos Energéticos del Norte [Member] | Sempra Mexico [Member] | IEnova [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in consolidated entity			50.00%