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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount classified as assets attributable to disposal group held for sale or disposed of.

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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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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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FAIR VALUE MEASUREMENTS - NONRECURRING FAIR VALUE MEASURES (Details) $ in Millions			1 Months Ended		3 Months Ended	12 Months Ended
	Feb. 06, 2019 USD ($)	Jun. 25, 2018 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Apr. 22, 2019 USD ($)	Feb. 07, 2019 USD ($)	Jan. 01, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investment			$ 9,652			$ 9,652	$ 11,519
Valuation, Market Approach [Member] \| TdM [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investment					$ 62
% of fair value measurement					100.00%
Range of inputs					100.00%
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, 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%
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 Mexico [Member] \| TdM [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other than temporary impairment in investment					$ 71
Sempra Renewables [Member] \| Wind Investments [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, net of taxes and noncontrolling interests				$ (900)
Assets, fair value disclosure		$ 145
Asset impairment charges				(1,500)
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, net of taxes and noncontrolling interests				(145)
Asset impairment charges				(200)
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
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
Asset impairment charges, net of taxes and noncontrolling interests						(145)
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, net of taxes and noncontrolling interests			$ 126	(755)		(629)
Asset impairment charges			183	$ (1,300)		(1,100)
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, net of taxes and noncontrolling interests		(755)
Asset impairment charges		(1,300)
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									$ 322	$ 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, 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, 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		0.1
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%
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		75.40%
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		90.90%
Bay Gas [Member] \| Sempra LNG [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Ownership interest	9.10%