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COMMITMENTS AND CONTINGENCIES - OTHER LITIGATION (Details) £ in Millions, $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
May 02, 2019 lawsuit | Mar. 31, 2019 USD ($) proof_of_claim | Mar. 31, 2019 GBP (£) proof_of_claim | Sep. 30, 2018 USD ($) | Oct. 01, 2014 USD ($) | Oct. 01, 2014 GBP (£)
Southern California Gas Company [Member] | Subsequent Event [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of lawsuits | 394 |  |  |  |  |
R B S Sempra Commodities [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Investment in RBS Sempra Commodities LLP | $ |  |  |  | $ 65.0 |  |
R B S Sempra Commodities [Member] | HMRC VAT Claim [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
VAT tax claim paid upon appeal |  |  |  |  | $ 138.0 | £ 86.0
Plaintiffs [Member] | HMRC VAT Claim [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Filed claims amount |  | $ 93.0 | £ 71.5 |  |  |
Energy Future Holdings Corp. [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of proof of claims | proof_of_claim |  | 28,000 | 28,000 |  |  |
Energy Future Holdings Corp. [Member] | Subsequent Event [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of lawsuits | 114 |  |  |  |  |
Number of lawsuits filed | 1,685 |  |  |  |  |

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