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Commitments And Contingent Liabilities (Guaranteed Obligations) (Detail) - Power [Member] - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Loss Contingencies [Line Items] |  |
Face Value of Outstanding Guarantees | $ 1,797 | $ 1,734
Exposure under Current Guarantees | 143 | 172
Letters of Credit Margin Posted | 164 | 122
Letters of Credit Margin Received | 136 | 192
Counterparty Cash Margin Deposited | 0 | 0
Counterparty Cash Margin Received | (4) | (15)
Net Broker Balance Deposited (Received) | (12) | (5)
Other Letters of Credit | 51 | $ 51
PennEast Natural Gas Pipeline [Member] |  |
Loss Contingencies [Line Items] |  |
Face Value of Outstanding Guarantees | 106 |
755 MW Gas-Fired Combined Cycle Generating Station [Member] |  |
Loss Contingencies [Line Items] |  |
Face Value of Outstanding Guarantees | $ 21 |

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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=6851643&loc=d3e12069-110248 + Details
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- Details
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- Details
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- Details
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