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Commitments And Contingent Liabilities (Guaranteed Obligations) (Detail) - Power [Member] - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Loss Contingencies [Line Items] |  |
Face Value of Outstanding Guarantees | $ 1,787 | $ 1,701
Exposure under Current Guarantees | 140 | 153
Letters of Credit Margin Posted | 163 | 103
Letters of Credit Margin Received | 17 | 32
Counterparty Cash Margin Deposited | 0 | 0
Counterparty Cash Margin Received | (3) | (1)
Net Broker Balance Deposited (Received) | 226 | 147
Other Letters of Credit | $ 63 | $ 61

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- Definition Counterparty Cash Margin Deposited + References No definition available. + Details
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- Definition Counterparty Cash Margin Received + References No definition available. + Details
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- Definition Exposure under Current Guarantees + References No definition available. + Details
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- Definition Letters of Credit Margin Posted + References No definition available. + Details
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- Definition Letters of Credit Margin Received + References No definition available. + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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