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v3.19.3.a.u2

Financial Risk Management Activities (Schedule Of Gross Volume, On Absolute Basis For Derivative Contracts) (Detail) $ / mwh in Millions, $ / Derivative in Millions, $ / DTH in Millions | 12 Months Ended
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Dec. 31, 2019 $ / Derivative $ / DTH $ / mwh | Dec. 31, 2018 $ / DTH $ / mwh
Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | 341 | 358
Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | (62) | (74)
FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | 13 | 18
Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / Derivative | 700 |
PSEG [Member] | Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | 0 | 0
PSEG [Member] | Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | 0 |
PSEG [Member] | FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | 0 | 0
PSEG [Member] | Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / Derivative | 700 |
PSEG Power LLC | Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / DTH | 341 | 358
PSEG Power LLC | Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | (62) | (74)
PSEG Power LLC | FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | 13 | 18
PSEG Power LLC | Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / Derivative | 0 |
Public Service Electric and Gas Company | Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / DTH | 0 | 0
Public Service Electric and Gas Company | Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | 0 | 0
Public Service Electric and Gas Company | FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | 0 | 0
Public Service Electric and Gas Company | Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / Derivative | 0 |

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