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Revenues Revenues (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2020
USD ($)
$ / mwd
MW
Mar. 31, 2019
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Revenues [Line Items]          
Cumulative Effect Adjustment       $ (2) $ 81
Revenue from Contract with Customers $ 2,449 $ 2,786      
Revenues Unrelated to Contracts with Customers [1] 332 194      
Total Operating Revenues 2,781 2,980      
Electric Distribution Contracts [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 649 742      
Gas Distribution [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 729 928      
Electric Transmission [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 366 288      
Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 368 515      
Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Electricity and Related Products [Member] | NY ISO [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 25 41      
Electricity and Related Products [Member] | ISO New England [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 48 21      
Gas Sales [Member] | Third Party Sales [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 29 47      
Gas Sales [Member] | Sales to Affiliates [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Other Revenues from Contracts with Customers [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers [2] $ 235 204      
Public Service Electric and Gas Company [Member]          
Revenues [Line Items]          
Allowances percentage of accounts receivable 7.00%     6.00%  
Revenue from Contract with Customers $ 1,828 2,025      
Revenues Unrelated to Contracts with Customers [1] 55 7      
Total Operating Revenues 1,883 2,032      
Public Service Electric and Gas Company [Member] | Electric Distribution Contracts [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 649 742      
Public Service Electric and Gas Company [Member] | Gas Distribution [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 731 931      
Public Service Electric and Gas Company [Member] | Electric Transmission [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 366 288      
Public Service Electric and Gas Company [Member] | Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Public Service Electric and Gas Company [Member] | Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Public Service Electric and Gas Company [Member] | Electricity and Related Products [Member] | NY ISO [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Public Service Electric and Gas Company [Member] | Electricity and Related Products [Member] | ISO New England [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Public Service Electric and Gas Company [Member] | Gas Sales [Member] | Third Party Sales [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Public Service Electric and Gas Company [Member] | Gas Sales [Member] | Sales to Affiliates [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Public Service Electric and Gas Company [Member] | Other Revenues from Contracts with Customers [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers [2] 82 64      
PSEG Power [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 955 1,239      
Revenues Unrelated to Contracts with Customers [1] 265 177      
Total Operating Revenues 1,220 1,416      
Anticipated Contract Revenues $ 161        
PSEG Power [Member] | PJM [Member] | June 2019 to May 2020 [Member]          
Revenues [Line Items]          
Dollars Per Megawatt-Day | $ / mwd 116        
Load (MW) | MW 8,300        
PSEG Power [Member] | PJM [Member] | June 2020 to May 2021 [Member]          
Revenues [Line Items]          
Dollars Per Megawatt-Day | $ / mwd 179        
Load (MW) | MW 7,300        
PSEG Power [Member] | PJM [Member] | June 2021 to May 2022 [Member]          
Revenues [Line Items]          
Dollars Per Megawatt-Day | $ / mwd 182        
Load (MW) | MW 6,900        
PSEG Power [Member] | ISO New England [Member] | June 2019 to May 2020 [Member]          
Revenues [Line Items]          
Dollars Per Megawatt-Day | $ / mwd 231        
Load (MW) | MW 1,330        
PSEG Power [Member] | ISO New England [Member] | June 2020 to May 2021 [Member]          
Revenues [Line Items]          
Dollars Per Megawatt-Day | $ / mwd 195        
Load (MW) | MW 1,330        
PSEG Power [Member] | ISO New England [Member] | June 2021 to May 2022 [Member]          
Revenues [Line Items]          
Dollars Per Megawatt-Day | $ / mwd 192        
Load (MW) | MW 950        
PSEG Power [Member] | ISO New England [Member] | June 2022 to May 2023 [Member]          
Revenues [Line Items]          
Dollars Per Megawatt-Day | $ / mwd 179        
Load (MW) | MW 950        
PSEG Power [Member] | ISO New England [Member] | June 2023 to May 2024 [Member]          
Revenues [Line Items]          
Dollars Per Megawatt-Day | $ / mwd 141        
Load (MW) | MW 1,060        
PSEG Power [Member] | ISO New England [Member] | June 2024 to May 2025 [Member]          
Revenues [Line Items]          
Dollars Per Megawatt-Day | $ / mwd 231        
Load (MW) | MW 480        
PSEG Power [Member] | ISO New England [Member] | June 2025 to May 2026 [Member]          
Revenues [Line Items]          
Dollars Per Megawatt-Day | $ / mwd 231        
Load (MW) | MW 480        
PSEG Power [Member] | Electric Distribution Contracts [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers $ 0 0      
PSEG Power [Member] | Gas Distribution [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
PSEG Power [Member] | Electric Transmission [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
PSEG Power [Member] | Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 368 515      
PSEG Power [Member] | Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 121 126      
PSEG Power [Member] | Electricity and Related Products [Member] | NY ISO [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 25 41      
PSEG Power [Member] | Electricity and Related Products [Member] | ISO New England [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 48 21      
PSEG Power [Member] | Gas Sales [Member] | Third Party Sales [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 29 47      
PSEG Power [Member] | Gas Sales [Member] | Sales to Affiliates [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 354 479      
PSEG Power [Member] | Other Revenues from Contracts with Customers [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers [2] 10 10      
Other [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 144 131      
Revenues Unrelated to Contracts with Customers [1] 12 10      
Total Operating Revenues 156 141      
Other [Member] | LIPA OSA contract fixed component [Member]          
Revenues [Line Items]          
Anticipated Contract Revenues 67        
Other [Member] | Electric Distribution Contracts [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Other [Member] | Gas Distribution [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Other [Member] | Electric Transmission [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Other [Member] | Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Other [Member] | Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Other [Member] | Electricity and Related Products [Member] | NY ISO [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Other [Member] | Electricity and Related Products [Member] | ISO New England [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Other [Member] | Gas Sales [Member] | Third Party Sales [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Other [Member] | Gas Sales [Member] | Sales to Affiliates [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Other [Member] | Other Revenues from Contracts with Customers [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers [2] 144 131      
Eliminations [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers (478) (609)      
Revenues Unrelated to Contracts with Customers [1] 0 0      
Total Operating Revenues (478) (609)      
Eliminations [Member] | Electric Distribution Contracts [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Eliminations [Member] | Gas Distribution [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers (2) (3)      
Eliminations [Member] | Electric Transmission [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Eliminations [Member] | Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Eliminations [Member] | Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers (121) (126)      
Eliminations [Member] | Electricity and Related Products [Member] | NY ISO [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Eliminations [Member] | Electricity and Related Products [Member] | ISO New England [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Eliminations [Member] | Gas Sales [Member] | Third Party Sales [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers 0 0      
Eliminations [Member] | Gas Sales [Member] | Sales to Affiliates [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers (354) (479)      
Eliminations [Member] | Other Revenues from Contracts with Customers [Member]          
Revenues [Line Items]          
Revenue from Contract with Customers [2] (1) (1)      
Public Service Electric and Gas Company [Member]          
Revenues [Line Items]          
Accounts Receivable, Allowance for Credit Loss, Recovery 2        
Cumulative Effect Adjustment       $ (2)  
Accounts Receivable and Unbilled Revenues, Allowance for Credit Losses 80   $ 68    
Provision for Other Credit Losses 32        
Accounts Receivable, Allowance for Credit Loss, Writeoff (20)        
Total Operating Revenues $ 1,883 $ 2,032      
Allowance for Credit Losses [Member] | Accounting Standards Update 2016-13 [Member] | Public Service Electric and Gas Company [Member]          
Revenues [Line Items]          
Cumulative Effect Adjustment     $ 8    
[1] Includes primarily alternative revenues at PSE&G, derivative contracts and lease contracts at PSEG Power, and lease contracts in Other.
[2] Includes primarily revenues from appliance repair services at PSE&G, solar power projects and energy management and fuel service contracts with LIPA at PSEG Power, and PSEG LI’s OSA with LIPA in Other.