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Commitments And Contingent Liabilities (Regulatory Proceedings) (Detail) - Power [Member] - FERC Compliance matters [Domain] $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
Loss Contingencies [Line Items] |
Loss Contingency. Loss in Period | $ 5
Loss Contingency, Estimate of Possible Loss | 40
Loss Contingency Accrual | $ 40

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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=82911808&loc=d3e14326-108349 + Details
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