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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.