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Commitments And Contingent Liabilities (Guaranteed Obligations) (Detail) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Loss Contingencies [Line Items] |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  | $ 226 |
Line of Credit Facility, Remaining Borrowing Capacity |  | 3,927 |
Power [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Face Value of Outstanding Guarantees |  | 1,809 | $ 1,734
Exposure under Current Guarantees |  | 136 | 172
Letters of Credit Margin Posted |  | 160 | 122
Letters of Credit Margin Received |  | 130 | 192
Counterparty Cash Margin Deposited |  | 0 | 0
Counterparty Cash Margin Received |  | (4) | (15)
Net Broker Balance Deposited (Received) |  | 30 | (5)
Other Letters of Credit |  | 51 | $ 51
Line of Credit Facility, Fair Value of Amount Outstanding |  | 202 |
Line of Credit Facility, Remaining Borrowing Capacity |  | 2,351 |
Pse And G [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding | [1] | 14 |
Line of Credit Facility, Remaining Borrowing Capacity |  | 586 |
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 |
[1] | The primary use of PSEG's and PSE&G's credit facilities is to support their respective CP Programs. PSEG and PSE&G had no amounts outstanding under their respective CP Programs as of June 30, 2016.

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