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Debt and Credit Facilities (Long-Term Debt Financing Transactions) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term Debt $ 14,558  
PSEG [Member]    
Debt Instrument [Line Items]    
Long-term Debt 2,450 $ 2,100
PSEG [Member] | Term Loan maturing in 2020 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount 700 0
PSEG [Member] | Term Loan maturing in 2019 [Member]    
Debt Instrument [Line Items]    
Long-term Debt 350 700
Repayments of Long-term Debt 350  
PSE&G [Member] | Medium Term Notes Five Point Three Zero Percentage Due On Two Thousand Eighteen [Member]    
Debt Instrument [Line Items]    
Repayments of Long-term Debt $ 400  
PSE&G [Member] | Medium Term Notes Two Point Three Zero Percent Due In Two Thousand Eighteen [Member]    
Debt Instrument [Line Items]    
Stated interest rate of debt instrument 2.30%  
Repayments of Long-term Debt $ 350  
PSE&G [Member] | Medium Term Notes Three Point Seven Zero Percent due Two Thousand Twenty Eight [Member]    
Debt Instrument [Line Items]    
Long-term Debt [1] 375 0
Debt Instrument, Face Amount $ 375  
Stated interest rate of debt instrument 3.70%  
PSE&G [Member] | Medium Term Notes Four Point Zero Five Percent due Two Thousand Forty Eight [Member]    
Debt Instrument [Line Items]    
Long-term Debt [1] $ 325 0
Debt Instrument, Face Amount $ 325  
Stated interest rate of debt instrument 4.05%  
PSE&G [Member] | Medium Term Notes Three Point Two Five Percent due Two Thousand Twenty Three [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount [1] $ 325 0
Stated interest rate of debt instrument 3.25%  
PSE&G [Member] | Medium Term Notes Three Point Six Five Percent due Two Thousand Twenty Eight [Member]    
Debt Instrument [Line Items]    
Long-term Debt [1] $ 325 0
Debt Instrument, Face Amount $ 325  
Stated interest rate of debt instrument 3.65%  
PSE&G [Member] | Medium Term Notes Five Point Three Zero Percentage Due On Two Thousand Eighteen [Member]    
Debt Instrument [Line Items]    
Long-term Debt [1] $ 0 400
Stated interest rate of debt instrument 5.30%  
PSE&G [Member] | Medium Term Notes Two Point Three Zero Percent Due In Two Thousand Eighteen [Member]    
Debt Instrument [Line Items]    
Long-term Debt [1] $ 0 350
Stated interest rate of debt instrument 2.30%  
Power [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 2,850 2,400
Power [Member] | Senior Notes Three Point Eight Five Percent due Two Thousand Twenty Three [Member]    
Debt Instrument [Line Items]    
Long-term Debt 700 0
Debt Instrument, Face Amount $ 700  
Stated interest rate of debt instrument 3.85%  
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%  
Repayments of Long-term Debt $ 250  
[1] Secured by essentially all property of PSE&G pursuant to its First and Refunding Mortgage.