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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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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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FAIR VALUE MEASUREMENTS - NONRECURRING FAIR VALUE MEASURES (Details) - Disposal Group Held-for-sale [Member] $ in Millions	1 Months Ended	9 Months Ended
	Jun. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 25, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charges	$ 1,500
Impairment charges net of taxes and noncontrolling interests	900
Sempra Renewables [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charges	200
Impairment charges net of taxes and noncontrolling interests	145
Sempra LNG & Midstream [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charges	1,300
Impairment charges net of taxes and noncontrolling interests	$ 755
Wind Facilities [Member] \| Sempra Renewables [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charges		$ 200
Impairment charges net of taxes and noncontrolling interests		145
Non-utility natural gas storage assets [Member] \| Sempra LNG & Midstream [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charges		1,300
Impairment charges net of taxes and noncontrolling interests		755
Carrying value of assets		154
Valuation Technique, Discounted Cash Flow [Member] \| LA Storage [Member] \| Nonrecurring Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of assets		32
Valuation Technique, Discounted Cash Flow [Member] \| Wind Facilities [Member] \| Sempra Renewables [Member] \| Nonrecurring Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets			$ 145
Percentage of fair value measurement			100.00%
Carrying value of assets		136
Valuation Technique, Discounted Cash Flow [Member] \| Non-utility natural gas storage assets [Member] \| Sempra LNG & Midstream [Member] \| Nonrecurring Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets			$ 190
Percentage of fair value measurement			100.00%
Carrying value of assets		$ 141
Bay Gas [Member] \| Non-utility natural gas storage assets [Member] \| Sempra LNG & Midstream [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Ownership interest			90.90%
LA Storage [Member] \| Non-utility natural gas storage assets [Member] \| Sempra LNG & Midstream [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Ownership interest			75.40%
Merchant Prices [Member] \| Minimum [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Wind Facilities [Member] \| Sempra Renewables [Member] \| Nonrecurring Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input			29
Merchant Prices [Member] \| Maximum [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Wind Facilities [Member] \| Sempra Renewables [Member] \| Nonrecurring Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input			92
Discount Rate [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Non-utility natural gas storage assets [Member] \| Sempra LNG & Midstream [Member] \| Nonrecurring Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input			10.00%
Discount Rate [Member] \| Minimum [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Wind Facilities [Member] \| Sempra Renewables [Member] \| Nonrecurring Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input			8.00%
Discount Rate [Member] \| Maximum [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Wind Facilities [Member] \| Sempra Renewables [Member] \| Nonrecurring Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input			10.00%
Storage Rates [Member] \| Minimum [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Non-utility natural gas storage assets [Member] \| Sempra LNG & Midstream [Member] \| Nonrecurring Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input			0.06
Storage Rates [Member] \| Maximum [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Non-utility natural gas storage assets [Member] \| Sempra LNG & Midstream [Member] \| Nonrecurring Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input			0.22