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CONTINGENCIES AND COMMITMENTS (Schedule of Loss Accrual) (Details) - Butte Fire - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Loss Contingency Accrual [Roll Forward] |  |  |
Loss accrual, beginning balance | $ 561,000,000 | $ 690,000,000 | $ 0
Accrued losses | 0 | 350,000,000 | 750,000,000
Payments | (118,000,000) | (479,000,000) | (60,000,000)
Loss accrual, ending balance | 443,000,000 | $ 561,000,000 | $ 690,000,000
Settlement agreements entered | 734,000,000 |  |
Settlement agreement paid | $ 657,000,000 |  |

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- Definition Settlement Agreements Paid By The Utility related to Butte Fire + References No definition available. + Details
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- Definition Settlement Agreements Entered By Utility related to the Butte Fire + References No definition available. + Details
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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Details
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