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Commitments And Contingent Liabilities (Guaranteed Obligations) (Detail) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
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Power [Member] |  |
Loss Contingencies [Line Items] |  |
Face Value of Outstanding Guarantees | $ 1,786 | $ 1,734
Exposure under Current Guarantees | 183 | 172
Letters of Credit Margin Posted | 169 | 122
Letters of Credit Margin Received | 220 | 192
Counterparty Cash Margin Deposited | 0 | 0
Counterparty Cash Margin Received | (17) | (15)
Net Broker Balance Deposited (Received) | 1 | (5)
Additional Collateral that could be Required | 851 | 864
Liquidity Available under PSEG’s and Power’s Credit Facilities to Post Collateral | 3,391 | 3,215
Other Letters of Credit | 51 | $ 51
Pse And G [Member] |  |
Loss Contingencies [Line Items] |  |
Line of Credit Facility, Fair Value of Amount Outstanding | 14 |
Line of Credit Facility, Remaining Borrowing Capacity | 615 |
PennEast Natural Gas Pipeline [Member] | Power [Member] |  |
Loss Contingencies [Line Items] |  |
Face Value of Outstanding Guarantees | 106 |
755 MW Gas-Fired Combined Cycle Generating Station [Member] | Power [Member] |  |
Loss Contingencies [Line Items] |  |
Face Value of Outstanding Guarantees | $ 21 |

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