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Fair value portion of investments in an entity not consolidated. Includes, but is not limited to, investments in an entity that is affiliated with the reporting entity by means of direct or indirect ownership, an entity in which the reporting entity shares control of the entity with another party or group, an entity which the company has significant influence, but does not have control and subsidiaries that are not required to be consolidated and are accounted for using the equity or cost method.

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FAIR VALUE MEASUREMENTS - NONRECURRING FAIR VALUE MEASURES (Details) - USD ($) $ in Millions				1 Months Ended	12 Months Ended
	Jan. 01, 2019	Dec. 31, 2018	Jun. 25, 2018	Jun. 30, 2018	Dec. 31, 2018	Apr. 22, 2019
Valuation, Market Approach [Member] \| Non-utility Natural gas Storage Assets [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investment		$ 337			$ 337
% of fair value measurement		100.00%			100.00%
Range of inputs		100.00%			100.00%
Valuation Technique, Discounted Cash Flow [Member] \| Non-utility Natural gas Storage Assets [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investment			$ 190
% of fair value measurement			100.00%
Valuation Technique, Discounted Cash Flow [Member] \| Certain U.S. Wind Equity Method Investments [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investment			$ 145
% of fair value measurement			100.00%
Sempra Renewables [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other than temporary impairment					$ 200
Disposal Group Held-for-sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairment charges				$ (1,500)
Asset impairment charges, net of taxes and noncontrolling interests				(900)
Disposal Group Held-for-sale [Member] \| Sempra LNG [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairment charges		$ 183	$ (1,300)		(1,100)
Asset impairment charges, net of taxes and noncontrolling interests		126			(629)
Proceeds from sale		5			5
Disposal Group Held-for-sale [Member] \| Sempra LNG [Member] \| Non-utility Natural gas Storage Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairment charges			(1,300)
Asset impairment charges, net of taxes and noncontrolling interests			(755)
Disposal Group Held-for-sale [Member] \| Sempra Renewables [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairment charges				(200)
Asset impairment charges, net of taxes and noncontrolling interests				$ (145)
Assets, fair value disclosure			145
Disposal Group Held-for-sale [Member] \| Sempra Renewables [Member] \| Wind Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other than temporary impairment					200
Other than temporary impairment, after tax					145
Disposal Group Held-for-sale [Member] \| Sempra Renewables [Member] \| Wind Generation Projects [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from sale						$ 569
Sempra LNG [Member] \| Disposal Group Disposed of by Sale [Member] \| Mississippi Hub And Bay Gas [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from sale	$ 332
Fair Value, Nonrecurring [Member] \| Disposal Group Held-for-sale [Member] \| Sempra LNG [Member] \| Non-utility Natural gas Storage Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale		$ 337			$ 337
Fair Value, Nonrecurring [Member] \| Disposal Group Held-for-sale [Member] \| Sempra LNG [Member] \| Non-utility Natural gas Storage Assets [Member] \| Valuation Technique, Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure			$ 190
Measurement Input, Storage Rate [Member] \| Minimum [Member] \| Fair Value, Nonrecurring [Member] \| Disposal Group Held-for-sale [Member] \| Sempra LNG [Member] \| Non-utility Natural gas Storage Assets [Member] \| Valuation Technique, Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measurement input			0.06
Measurement Input, Storage Rate [Member] \| Maximum [Member] \| Fair Value, Nonrecurring [Member] \| Disposal Group Held-for-sale [Member] \| Sempra LNG [Member] \| Non-utility Natural gas Storage Assets [Member] \| Valuation Technique, Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measurement input			0.22
Measurement Input, Storage Rate [Member] \| Weighted Average [Member] \| Fair Value, Nonrecurring [Member] \| Disposal Group Held-for-sale [Member] \| Sempra LNG [Member] \| Non-utility Natural gas Storage Assets [Member] \| Valuation Technique, Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measurement input			(0.10)
Measurement Input, Commodity Market Price [Member] \| Minimum [Member] \| Fair Value, Nonrecurring [Member] \| Disposal Group Held-for-sale [Member] \| Sempra Renewables [Member] \| Wind Generation Projects [Member] \| Valuation Technique, Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measurement input			29
Measurement Input, Commodity Market Price [Member] \| Maximum [Member] \| Fair Value, Nonrecurring [Member] \| Disposal Group Held-for-sale [Member] \| Sempra Renewables [Member] \| Wind Generation Projects [Member] \| Valuation Technique, Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measurement input			92
Measurement Input, Discount Rate [Member] \| Valuation, Market Approach [Member] \| Non-utility Natural gas Storage Assets [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range of inputs			10.00%
Measurement Input, Discount Rate [Member] \| Minimum [Member] \| Fair Value, Nonrecurring [Member] \| Disposal Group Held-for-sale [Member] \| Sempra Renewables [Member] \| Wind Generation Projects [Member] \| Valuation Technique, Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range of inputs			8.00%
Measurement Input, Discount Rate [Member] \| Maximum [Member] \| Fair Value, Nonrecurring [Member] \| Disposal Group Held-for-sale [Member] \| Sempra Renewables [Member] \| Wind Generation Projects [Member] \| Valuation Technique, Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range of inputs			10.00%
Measurement Input, Discount Rate [Member] \| Weighted Average [Member] \| Fair Value, Nonrecurring [Member] \| Disposal Group Held-for-sale [Member] \| Sempra Renewables [Member] \| Wind Generation Projects [Member] \| Valuation Technique, Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range of inputs			8.70%
Bay Gas [Member] \| Sempra LNG [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash consideration (fair value of total consideration)	$ 20
Bay Gas [Member] \| Bay Gas [Member] \| Disposal Group Held-for-sale [Member] \| Sempra LNG [Member] \| Non-utility Natural gas Storage Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Ownership interest (as a percent)			90.90%
Bay Gas [Member] \| Sempra LNG [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Ownership interest (as a percent)	9.10%
LA Storage [Member] \| LA Storage [Member] \| Disposal Group Held-for-sale [Member] \| Sempra LNG [Member] \| Non-utility Natural gas Storage Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Ownership interest (as a percent)			75.40%