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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - RESTRICTED NET ASSETS (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Significant Restrictions of Subsidiaries [Line Items] |
Undistributed earnings of equity investments | $ 332
Sempra Texas Utility [Member] | Oncor Holdings Electric Delivery Company LLC [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Ownership percentage in equity method investee | 100.00%
Sempra Texas Utility [Member] | Oncor Electric Delivery Company LLC [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Ownership percentage in equity method investee | 80.25%
Sempra South American Utilities [Member] | Luz Del Sur [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Restricted net assets of consolidated subsidiaries | $ 35
Sempra Mexico [Member] | Mexican Subsidiaries [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Restricted net assets of consolidated subsidiaries | 153
Sempra Mexico [Member] | IEnova Pipelines [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Restricted net assets of consolidated subsidiaries | 10
Sempra Mexico [Member] | Ventika [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Restricted net assets of consolidated subsidiaries | 14
Sempra Mexico [Member] | Energia Sierra Juarez Wind Project [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Restricted net assets of consolidated subsidiaries | $ 14
Ownership percentage in equity method investee | 50.00%
Sempra Mexico [Member] | TAG Pipeline Norte [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Restricted net assets of consolidated subsidiaries | $ 89
Ownership percentage in equity method investee | 50.00%
Sempra Renewables [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Restricted net assets of consolidated subsidiaries | $ 122
Sempra Renewables [Member] | Joint Venture One [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Ownership percentage in equity method investee | 50.00%
Sempra LNG & Midstream [Member] | Cameron LNG Holdings [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Restricted net assets of consolidated subsidiaries | $ 8,700
Consolidated Entities [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Restricted net assets of consolidated subsidiaries | 9,300
Unconsolidated Entities [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Restricted net assets of consolidated subsidiaries | 18,600
San Diego Gas and Electric Company [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Restricted net assets of consolidated subsidiaries | 5,500
Amount available for dividend distribution and loans without prior approval from regulatory agency | $ 552
Authorized percentage of equity | 52.00%
Southern California Gas Company [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Restricted net assets of consolidated subsidiaries | $ 3,600
Amount available for dividend distribution and loans without prior approval from regulatory agency | $ 618
Authorized percentage of equity | 52.00%
California Utilities [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Maximum ratio of indebtedness to total capitalization | 0.65
Sempra Texas Utility [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Maximum ratio of indebtedness to total capitalization | 0.65
Plan percentage of capital structure allocated to debt | 57.50%
Plan percentage of capital structure allocated to equity | 42.50%
Oncor Electric Delivery Company LLC [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Restricted net assets of consolidated subsidiaries | $ 9,700
Minimum [Member] | San Diego Gas and Electric Company [Member] |
Significant Restrictions of Subsidiaries [Line Items] |
Minimum common equity ratio | 30.00%

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