ACQUISTION AND DIVESTITURE ACTIVITY - ASSETS HELD FOR SALE (Details)		1 Months Ended				3 Months Ended		12 Months Ended
	Jun. 25, 2018 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Feb. 29, 2016 MW	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Feb. 28, 2019 USD ($)	Feb. 07, 2019 USD ($)	Feb. 06, 2019 USD ($)	Jan. 01, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment		$ 9,652,000,000						$ 9,652,000,000	$ 0
Disposal Group Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment charges			$ (1,500,000,000)
Asset impairment charges, net of taxes and noncontrolling interests			(900,000,000)
Sempra Mexico [Member] | Termoelectrica de Mexicali [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Generating capacity (in mw) | MW					625
Other than temporary impairment in investment				$ 71,000,000		$ 71,000,000	$ 131,000,000
Other than temporary impairment in investment, net of tax							$ 111,000,000
Deferred tax expense									$ (8,000,000)	$ 8,000,000
Sempra LNG & Midstream [Member] | Disposal Group Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment charges		183,000,000	(1,300,000,000)					(1,100,000,000)
Asset impairment charges, net of taxes and noncontrolling interests		126,000,000	(755,000,000)					(629,000,000)
Proceeds from sale		5,000,000						5,000,000
Sempra LNG & Midstream [Member] | Disposal Group Held-for-sale [Member] | Non-utility Natural gas Storage Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment charges	$ (1,300,000,000)
Asset impairment charges, net of taxes and noncontrolling interests	$ (755,000,000)
Assets Held for Sale, Assets [Abstract]
Cash		0						0
Accounts receivable – trade, net		5,000,000						5,000,000
Accounts receivable – other, net		0						0
Other current assets		6,000,000						6,000,000
Property, plant and equipment, net		324,000,000						324,000,000
Other noncurrent assets		1,000,000						1,000,000
Total assets held for sale		336,000,000						336,000,000
Assets Held for Sale, Liabilities [Abstract]
Accounts payable		2,000,000						2,000,000
Other current liabilities		3,000,000						3,000,000
Asset retirement obligations		8,000,000						8,000,000
Total liabilities held for sale		13,000,000						13,000,000
Sempra Renewables [Member] | Wind Investments [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment		291,000,000						291,000,000
Sempra Renewables [Member] | Disposal Group Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment charges			(200,000,000)
Asset impairment charges, net of taxes and noncontrolling interests			$ (145,000,000)
Sempra Renewables [Member] | Disposal Group Held-for-sale [Member] | Wind and Solar Investments [Member]
Assets Held for Sale, Assets [Abstract]
Cash		7,000,000						7,000,000
Accounts receivable – trade, net		2,000,000						2,000,000
Accounts receivable – other, net		1,000,000						1,000,000
Other current assets		1,000,000						1,000,000
Property, plant and equipment, net		366,000,000						366,000,000
Other noncurrent assets		0						0
Total assets held for sale		377,000,000						377,000,000
Assets Held for Sale, Liabilities [Abstract]
Accounts payable		2,000,000						2,000,000
Other current liabilities		4,000,000						4,000,000
Asset retirement obligations		6,000,000						6,000,000
Total liabilities held for sale		12,000,000						12,000,000
Sempra Renewables [Member] | Disposal Group Held-for-sale [Member] | Wind Investments [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment charges, net of taxes and noncontrolling interests								(145,000,000)
Noncontrolling Tax Equity Investors, Wind [Member] | Subsequent Event [Member] | Disposal Group Disposed of by Sale [Member] | Sempra Renewables [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale											$ 551,000,000
Sempra LNG & Midstream [Member] | Disposal Group Disposed of by Sale [Member] | Mississippi Hub And Bay Gas [Member]
Assets Held for Sale, Assets [Abstract]
Total assets held for sale		$ 323,000,000						$ 323,000,000
Sempra LNG & Midstream [Member] | Subsequent Event [Member] | Disposal Group Disposed of by Sale [Member] | Mississippi Hub And Bay Gas [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale												$ 328,000,000		$ 332,000,000
Bay Gas [Member] | Sempra LNG & Midstream [Member] | Subsequent Event [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment													$ 20,000,000
Ownership percentage in equity method investee													9.10%