ACQUISTION AND DIVESTITURE ACTIVITY - ASSETS HELD FOR SALE (Details) $ in Millions		1 Months Ended
	Jun. 25, 2018 MW Bcf	Jun. 30, 2018 USD ($)	Feb. 29, 2016 MW	Dec. 31, 2017 USD ($)	[1]
Assets Held for Sale, Liabilities [Abstract]
Equity method investment		$ 9,407		$ 0
Disposal Group Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges		1,500
Impairment charges net of taxes and noncontrolling interests		900
Sempra Mexico [Member] | TdM [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Generating capacity | MW			625
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]
Impairment charges		1,300
Impairment charges net of taxes and noncontrolling interests		755
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]
Natural gas storage capacity | Bcf	22
Impairment charges		1,300
Impairment charges net of taxes and noncontrolling interests		755
Assets Held for Sale, Assets [Abstract]
Cash and cash equivalents		0
Restricted cash		0
Accounts receivable – trade, net		4
Accounts receivable – other, net		0
Inventories		0
Fixed-price contracts and other derivatives, current		0
Other current assets		5
Property, plant and equipment, net		140
Fixed-price contracts and other derivatives, noncurrent		0
Other noncurrent assets		1
Total assets held for sale		150
Assets Held for Sale, Liabilities [Abstract]
Accounts payable – trade		0
Current portion of long-term debt		0
Fixed-price contracts and other derivatives, current		0
Other current liabilities		4
Long-term debt		0
Asset retirement obligations		8
Fixed-price contracts and other derivatives, noncurrent		0
Other noncurrent liabilities		0
Total liabilities held for sale		12
Sempra Renewables [Member] | Wind and Solar Investments [Member]
Assets Held for Sale, Liabilities [Abstract]
Equity method investment		612
Sempra Renewables [Member] | Disposal Group Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges		200
Impairment charges net of taxes and noncontrolling interests		145
Assets Held for Sale, Assets [Abstract]
Fixed-price contracts and other derivatives, current		1
Fixed-price contracts and other derivatives, noncurrent		2
Assets Held for Sale, Liabilities [Abstract]
Current portion of long-term debt		7
Long-term debt		63
Sempra Renewables [Member] | Disposal Group Held-for-sale [Member] | Wind Facilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Generating capacity | MW	1,335
Impairment charges		200
Impairment charges net of taxes and noncontrolling interests		145
Sempra Renewables [Member] | Disposal Group Held-for-sale [Member] | Solar Facilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Generating capacity | MW	1,262
Sempra Renewables [Member] | Disposal Group Held-for-sale [Member] | Wind and Solar Investments [Member]
Assets Held for Sale, Assets [Abstract]
Cash and cash equivalents		29
Restricted cash		2
Accounts receivable – trade, net		16
Accounts receivable – other, net		5
Inventories		5
Fixed-price contracts and other derivatives, current		1
Other current assets		4
Property, plant and equipment, net		1,660
Fixed-price contracts and other derivatives, noncurrent		2
Other noncurrent assets		3
Total assets held for sale		1,727
Assets Held for Sale, Liabilities [Abstract]
Accounts payable – trade		12
Current portion of long-term debt		7
Fixed-price contracts and other derivatives, current		1
Other current liabilities		5
Long-term debt		63
Asset retirement obligations		57
Fixed-price contracts and other derivatives, noncurrent		1
Other noncurrent liabilities		2
Total liabilities held for sale		$ 148
Bay Gas [Member] | 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]
Natural gas storage capacity | Bcf	20
Ownership interest	90.90%

[1] Derived from audited financial statements.