Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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ACQUISTIONS, DIVESTITURES AND DISCONTINUED OPERATIONS - Sempra Mexico (Details) - USD ($) $ in Millions		12 Months Ended
	Nov. 15, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 14, 2017
Business Acquisition [Line Items]
Cash paid, net of cash and cash equivalents acquired		$ 0	$ 9,568	$ 147
IEnova [Member] \| Sempra Mexico [Member] \| Ductos Energéticos del Norte [Member]
Business Acquisition [Line Items]
Acquired percentage interest	50.00%
Ownership percentage before acquisition					50.00%
Cash paid, net of cash and cash equivalents acquired	$ 165
Cash acquired from acquisition	18
Debt assumed	$ 96
Ownership percentage in consolidated entity	100.00%
Ownership percentage in equity method investee					50.00%
Other intangible assets	$ 66
Weighted average life of finite-lived intangible acquired	23 years
Ramones Norte Pipeline [Member] \| IEnova [Member] \| Sempra Mexico [Member] \| Ductos Energéticos del Norte [Member]
Business Acquisition [Line Items]
Ownership percentage before acquisition	25.00%				50.00%
Ownership percentage in consolidated entity	50.00%