v3.6.0.2

QUARTERLY FINANCIAL DATA (UNAUDITED) - NARRATIVE (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | May 31, 2016 | Mar. 31, 2016 | Dec. 31, 2016
Sempra LNG & Midstream [Member] |  |  |  |
Significant Items Affecting Quarterly Results [Line Items] |  |  |  |
Equity Method Investment, Realized Gain (Loss) on Released Pipeline Capacity |  | $ 206 |  |
Equity Method Investment, Realized Gain (Loss) on Released Pipeline Capacity, Net of Tax |  | $ 123 |  |
Equity Method Investment, Impairment Amount |  |  | $ 44 |
Equity Method Investment, Impairment Amount, Net of Tax |  |  | $ 27 |
GdC [Member] | Sempra Mexico [Member] | IEnova [Member] |  |  |  |
Significant Items Affecting Quarterly Results [Line Items] |  |  |  |
Gain on acquisition of remaining voting rights | $ 617 |  |  | $ 617
Gain on acquisition of remaining voting rights, net of tax | 432 |  |  | $ 432
Equity Method Investment, Realized Gain (Loss) on Acquisition of Remaining Voting Rights, Net of Tax and Noncontrolling Interest | 350 |  |  |
Termoelectrica de Mexicali [Member] | Sempra Mexico [Member] |  |  |  |
Significant Items Affecting Quarterly Results [Line Items] |  |  |  |
Other than temporary impairment in investment | 131 |  |  |
Other than temporary impairment in investment, net of tax | 111 |  |  |
Equity Method Investment Other Than Temporary Impairment Net Of Tax Benefit and Noncontrolling Interest | $ 90 |  |  |

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