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INVESTMENTS IN UNCONSOLIDATED ENTITIES - SUMMARIZED FINANCIAL INFORMATION (Details) - Oncor Holdings [Member] - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |
Operating revenues | $ 236 | $ 1,016
Operating expense | (185) | (775)
Income from operations | 51 | 241
Interest expense | (22) | (86)
Income tax expense | (7) | (23)
Net income / Earnings | 19 | 114
Noncontrolling interest held by TTI | (4) | (23)
Earnings attributable to Sempra Energy | $ 15 | $ 91

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