v3.8.0.1

COMMITMENTS AND CONTINGENCIES - OTHER LITIGATION (Details) £ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 GBP (£) | May 03, 2018 lawsuit | Mar. 31, 2018 USD ($) proof_of_claim lawsuit | Oct. 01, 2014 GBP (£)
Loss Contingencies [Line Items] |  |  |  |
Investment in RBS Sempra Commodities LLP | $ |  |  | $ 67 |
HMRC VAT Claim [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
VAT tax claim paid upon appeal |  |  |  | £ 86
Filed claims amount | £ 160 |  |  |
Southern California Gas Company [Member] | Subsequent Event [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of lawsuits | lawsuit |  | 381 |  |
Plaintiffs [Member] | HMRC VAT Claim [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Filed claims amount | £ 80 |  |  |
Energy Future Holdings Corp. [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of lawsuits | lawsuit |  |  | 140 |
Number of proof of claims | proof_of_claim |  |  | 28,000 |

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