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Debt and Credit Facilties (Long-Term Debt) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 14,558 |
Long-term Debt, Current Maturities |  | (1,294) | $ (1,000)
Total Long-Term Debt |  | 13,168 | 12,068
PSEG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | 2,450 | 2,100
Long-term Debt, Current Maturities |  | (750) | 0
Net Unamortized Discount and Debt Issuance Costs |  | (7) | (9)
Total Long-Term Debt |  | 1,693 | 2,091
PSEG [Member] | Term Loan maturing in 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 350 | 700
Maturity Year |  | 2019 |
PSEG [Member] | Term Loan maturing in 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount |  | $ 700 | 0
Maturity Year |  | 2020 |
PSEG [Member] | Variable Rate Term Loan due 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 1,050 | 700
PSEG [Member] | Senior Notes One Point Six Zero Percent Due In Two Thousand Nineteen [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 400 | 400
Stated interest rate of debt instrument |  | 1.60% |
Maturity Year |  | 2019 |
PSEG [Member] | Senior Notes Two Point Zero Percent Due In Two Thousand Twenty One [Member] [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 300 | 300
Stated interest rate of debt instrument |  | 2.00% |
Maturity Year |  | 2021 |
PSEG [Member] | Senior Notes Two Point Six Five Percent Due In Two Thousand Twenty Two [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 700 | 700
Stated interest rate of debt instrument |  | 2.65% |
Maturity Year |  | 2022 |
PSEG [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 1,400 | 1,400
Power [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | 2,850 | 2,400
Long-term Debt, Current Maturities |  | (44) | (250)
Net Unamortized Discount and Debt Issuance Costs |  | (15) | (14)
Total Long-Term Debt |  | 2,791 | 2,136
Power [Member] | Senior Notes Two Point Four Five Percentage Due Two Thousand Eighteen [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 0 | 250
Stated interest rate of debt instrument |  | 2.45% |
Maturity Year |  | 2018 |
Power [Member] | Senior Notes Five Point One Three Percentage Due Two Thousand Twenty [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 406 | 406
Stated interest rate of debt instrument |  | 5.13% |
Maturity Year |  | 2020 |
Power [Member] | Senior Notes Four Point One Five Percentage Due Two Thousand Twenty One [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 700 | 700
Stated interest rate of debt instrument |  | 3.00% |
Maturity Year |  | 2021 |
Power [Member] | Senior Notes Three Point Zero Percent Due In Two Thousand Twenty One [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 250 | 250
Stated interest rate of debt instrument |  | 4.15% |
Maturity Year |  | 2021 |
Power [Member] | Senior Notes Three Point Eight Five Percent due Two Thousand Twenty Three [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 700 | 0
Stated interest rate of debt instrument |  | 3.85% |
Debt Instrument, Face Amount |  | $ 700 |
Maturity Year |  | 2023 |
Power [Member] | Senior Notes Four Point Three Percent Due Two Thousand Twenty Three [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 250 | 250
Stated interest rate of debt instrument |  | 4.30% |
Maturity Year |  | 2023 |
Power [Member] | Senior Notes Eight Point Six Three Percent Due Two Thousand Thirty One [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 500 | 500
Stated interest rate of debt instrument |  | 8.63% |
Maturity Year |  | 2031 |
Power [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 2,806 | 2,356
Power [Member] | Pollution Control Notes Floating Rate Due On Two Thousand Nineteen [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [1] | $ 44 | 44
Maturity Year | [1] | 2019 |
Power [Member] | Pollution Control Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 44 | 44
PSE&G [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Current Maturities |  | (500) | (750)
Total Long-Term Debt |  | 8,684 | 7,841
PSE&G [Member] | First And Refunding Mortgage Bonds Nine Point Two Five Percentage Due On Two Twenty One [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 134 | 134
Stated interest rate of debt instrument |  | 9.25% |
Maturity Year | [2] | 2021 |
PSE&G [Member] | First And Refunding Mortgage Bonds Eight Point Zero Zero Percentage Due On Two Thirty Seven [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 7 | 7
Stated interest rate of debt instrument |  | 8.00% |
Maturity Year | [2] | 2037 |
PSE&G [Member] | First And Refunding Mortgage Bonds Five Point Zero Zero Percentage Due On Two Thirty Seven [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 8 | 8
Stated interest rate of debt instrument |  | 5.00% |
Maturity Year | [2] | 2037 |
PSE&G [Member] | First And Refunding Mortgage Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 149 | 149
PSE&G [Member] | Medium Term Notes Five Point Three Zero Percentage Due On Two Thousand Eighteen [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 0 | 400
Stated interest rate of debt instrument |  | 5.30% |
Maturity Year | [2] | 2018 |
PSE&G [Member] | Medium Term Notes Two Point Three Zero Percent Due In Two Thousand Eighteen [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 0 | 350
Stated interest rate of debt instrument |  | 2.30% |
Maturity Year | [2] | 2018 |
PSE&G [Member] | Medium Term Notes One Point Eight Percent Due In Two Thousand Nineteen [Member] [Domain] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 250 | 250
Stated interest rate of debt instrument |  | 1.80% |
Maturity Year | [2] | 2019 |
PSE&G [Member] | Medium Term Notes Two Point Zero Percent Due In Two Thousand Nineteen [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 250 | 250
Stated interest rate of debt instrument |  | 2.00% |
Maturity Year | [2] | 2019 |
PSE&G [Member] | Medium Term Notes Three Point Five Zero Percentage Due On Two Thousand Twenty [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 250 | 250
Stated interest rate of debt instrument |  | 3.50% |
Maturity Year | [2] | 2020 |
PSE&G [Member] | Medium Term Notes Seven Point Zero Four Percentage Due On Two Thousand Twenty [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 9 | 9
Stated interest rate of debt instrument |  | 7.04% |
Maturity Year | [2] | 2020 |
PSE&G [Member] | Medium Term Notes One Point Nine Zero Percent Due In Two Thousand Twenty One [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 300 | 300
Stated interest rate of debt instrument |  | 1.90% |
Maturity Year | [2] | 2021 |
PSE&G [Member] | Medium Term Notes Two Point Three Eight Percent Due In Two Thousand Twenty Three [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 500 | 500
Stated interest rate of debt instrument |  | 2.375% |
Maturity Year | [2] | 2023 |
PSE&G [Member] | Medium Term Notes Three Point Two Five Percent due Two Thousand Twenty Three [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate of debt instrument |  | 3.25% |
Debt Instrument, Face Amount | [2] | $ 325 | 0
Maturity Year | [2] | 2023 |
PSE&G [Member] | Medium Term Notes Three Point Seven Five Percent Due In Two Thousand Twenty Four [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 250 | 250
Stated interest rate of debt instrument |  | 3.75% |
Maturity Year | [2] | 2024 |
PSE&G [Member] | Medium Term Notes Three Point One Five Percent Due In Two Thousand Twenty Four [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 250 | 250
Stated interest rate of debt instrument |  | 3.15% |
Maturity Year | [2] | 2024 |
PSE&G [Member] | Medium Term Notes Three Point Zero Five Percent Due In Two Thousand Twenty Four [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 250 | 250
Stated interest rate of debt instrument |  | 3.05% |
Maturity Year | [2] | 2024 |
PSE&G [Member] | Medium Term Notes Three Point Zero Percent Due In Two Thousand Twenty Five [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 350 | 350
Stated interest rate of debt instrument |  | 3.00% |
Maturity Year | [2] | 2025 |
PSE&G [Member] | Medium Term Notes Two Point Two Five Percent due Two Thousand Twenty Six [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 425 | 425
Stated interest rate of debt instrument |  | 2.25% |
Maturity Year | [2] | 2026 |
PSE&G [Member] | Medium Term Notes Three Point Zero Percent due Two Thousand Twenty Seven [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 425 | 425
Stated interest rate of debt instrument |  | 3.00% |
Maturity Year | [2] | 2027 |
PSE&G [Member] | Medium Term Notes Three Point Seven Zero Percent due Two Thousand Twenty Eight [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 375 | 0
Stated interest rate of debt instrument |  | 3.70% |
Debt Instrument, Face Amount |  | $ 375 |
Maturity Year | [2] | 2028 |
PSE&G [Member] | Medium Term Notes Three Point Six Five Percent due Two Thousand Twenty Eight [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 325 | 0
Stated interest rate of debt instrument |  | 3.65% |
Debt Instrument, Face Amount |  | $ 325 |
Maturity Year | [2] | 2028 |
PSE&G [Member] | Medium Term Notes Five Point Two Five Percentage Due On Two Thousand Thirty Five [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 250 | 250
Stated interest rate of debt instrument |  | 5.25% |
Maturity Year | [2] | 2035 |
PSE&G [Member] | Medium Term Notes Five Point Seven Zero Percentage Due On Two Thousand Thirty Six [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 250 | 250
Stated interest rate of debt instrument |  | 5.70% |
Maturity Year | [2] | 2036 |
PSE&G [Member] | Medium Term Notes Five Point Eight Zero Percentage Due On Two Thousand Thirty Seven [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 350 | 350
Stated interest rate of debt instrument |  | 5.80% |
Maturity Year | [2] | 2037 |
PSE&G [Member] | Medium Term Notes Five Point Three Eight Percentage Due On Two Thousand Thirty Nine [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 250 | 250
Stated interest rate of debt instrument |  | 5.38% |
Maturity Year | [2] | 2039 |
PSE&G [Member] | Medium Term Notes Five Point Five Zero Percentage Due On Two Thousand Forty [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 300 | 300
Stated interest rate of debt instrument |  | 5.50% |
Maturity Year | [2] | 2040 |
PSE&G [Member] | Medium-Term Notes 3.95% Due On 2042 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 450 | 450
Stated interest rate of debt instrument |  | 3.95% |
Maturity Year | [2] | 2042 |
PSE&G [Member] | Medium-Term Notes 3.65% Due On 2042 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 350 | 350
Stated interest rate of debt instrument |  | 3.65% |
Maturity Year | [2] | 2042 |
PSE&G [Member] | Medium Term Notes Three Point Eight Zero Percent Due In Two Thousand Forty Three [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 400 | 400
Stated interest rate of debt instrument |  | 3.80% |
Maturity Year | [2] | 2043 |
PSE&G [Member] | Medium Term Notes Four Point Zero Percent Due In Two Thousand Forty Four [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 250 | 250
Stated interest rate of debt instrument |  | 4.00% |
Maturity Year | [2] | 2044 |
PSE&G [Member] | Medium Term Notes Four Point Zero Five Percent due Two Thousand Forty Five [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 250 |
Stated interest rate of debt instrument |  | 4.05% |
Maturity Year | [2] | 2045 |
PSE&G [Member] | Medium Term Notes Four Point One Five Percent Due In Two Thousand Forty Five [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 250 | 250
Stated interest rate of debt instrument |  | 4.15% |
Maturity Year | [2] | 2045 |
PSE&G [Member] | Medium Term Notes Three Point Eight Zero Percent due Two Thousand Forty Six [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 550 | 550
Stated interest rate of debt instrument |  | 3.80% |
Maturity Year | [2] | 2046 |
PSE&G [Member] | Medium Term Notes Three Point Six Zero Percent due Two Thousand Forty Seven [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 350 | 350
Stated interest rate of debt instrument |  | 3.60% |
Maturity Year | [2] | 2047 |
PSE&G [Member] | Medium Term Notes Four Point Zero Five Percent due Two Thousand Forty Eight [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | [2] | $ 325 | 0
Stated interest rate of debt instrument |  | 4.05% |
Debt Instrument, Face Amount |  | $ 325 |
Maturity Year | [2] | 2048 |
PSE&G [Member] | Total Medium Term Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | $ 9,109 | 8,509
PSE&G |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt |  | 9,258 | 8,658
Long-term Debt, Current Maturities |  | (500) | (750)
Net Unamortized Discount and Debt Issuance Costs |  | (74) | (67)
Total Long-Term Debt |  | $ 8,684 | $ 7,841
[1] | The Pennsylvania Economic Development Authority (PEDFA) bond that is serviced and secured by Power Pollution Control Notes is a variable rate bond that is in weekly reset mode.
[2] | Secured by essentially all property of PSE&G pursuant to its First and Refunding Mortgage.

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