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 |