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Revenues Revenues (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
$ / mwd
MW
Mar. 31, 2018
USD ($)
Dec. 31, 2018
Revenues [Line Items]      
Revenue from Contract with Customers $ 2,786 $ 2,644  
Revenues Unrelated to Contracts with Customers [1] 194 174  
Total Operating Revenues 2,980 2,818  
Electric Distribution Contracts [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 742 690  
Gas Distribution [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 928 756  
Electric Transmission [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 288 312  
Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 515 498  
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 41 59  
Electricity and Related Products [Member] | ISO New England [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 21 47  
Gas Sales [Member] | Third Party Sales [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 47 64  
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] $ 204 218  
PSE And G [Member]      
Revenues [Line Items]      
Allowances percentage of accounts receivable 6.00%   7.00%
Revenue from Contract with Customers $ 2,025 1,833  
Revenues Unrelated to Contracts with Customers [1] 7 12  
Total Operating Revenues 2,032 1,845  
PSE And G [Member] | Electric Distribution Contracts [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 742 690  
PSE And G [Member] | Gas Distribution [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 931 759  
PSE And G [Member] | Electric Transmission [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 288 312  
PSE And G [Member] | Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 0 0  
PSE And G [Member] | Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 0 0  
PSE And G [Member] | Electricity and Related Products [Member] | NY ISO [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 0 0  
PSE And G [Member] | Electricity and Related Products [Member] | ISO New England [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 0 0  
PSE And G [Member] | Gas Sales [Member] | Third Party Sales [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 0 0  
PSE And G [Member] | Gas Sales [Member] | Sales to Affiliates [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 0 0  
PSE And G [Member] | Other Revenues from Contracts with Customers [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers [2] 64 72  
Power [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 1,239 1,251  
Revenues Unrelated to Contracts with Customers [1] 177 152  
Total Operating Revenues 1,416 1,403  
Anticipated Contract Revenues $ 177    
Power [Member] | PJM [Member] | June 2018 to May 2019 [Member]      
Revenues [Line Items]      
Dollars Per Megawatt-Day | $ / mwd 205    
Load (MW) | MW 9,200    
Power [Member] | PJM [Member] | June 2019 to May 2020 [Member]      
Revenues [Line Items]      
Dollars Per Megawatt-Day | $ / mwd 115    
Load (MW) | MW 9,000    
Power [Member] | PJM [Member] | June 2020 to May 2021 [Member]      
Revenues [Line Items]      
Dollars Per Megawatt-Day | $ / mwd 170    
Load (MW) | MW 8,100    
Power [Member] | PJM [Member] | June 2021 to May 2022 [Member]      
Revenues [Line Items]      
Dollars Per Megawatt-Day | $ / mwd 178    
Load (MW) | MW 7,700    
Power [Member] | ISO New England [Member] | June 2018 to May 2019 [Member]      
Revenues [Line Items]      
Dollars Per Megawatt-Day | $ / mwd 314    
Load (MW) | MW 820    
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    
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    
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    
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    
Power [Member] | ISO New England [Member] | June 2023 to May 2024 [Member]      
Revenues [Line Items]      
Dollars Per Megawatt-Day | $ / mwd 231    
Load (MW) | MW 480    
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    
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    
Power [Member] | Electric Distribution Contracts [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers $ 0 0  
Power [Member] | Gas Distribution [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 0 0  
Power [Member] | Electric Transmission [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 0 0  
Power [Member] | Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 515 498  
Power [Member] | Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 126 176  
Power [Member] | Electricity and Related Products [Member] | NY ISO [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 41 59  
Power [Member] | Electricity and Related Products [Member] | ISO New England [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 21 47  
Power [Member] | Gas Sales [Member] | Third Party Sales [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 47 64  
Power [Member] | Gas Sales [Member] | Sales to Affiliates [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers 479 397  
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 131 137  
Revenues Unrelated to Contracts with Customers [1] 10 10  
Total Operating Revenues 141 147  
Other [Member] | LIPA OSA contract fixed component [Member]      
Revenues [Line Items]      
Anticipated Contract Revenues 65    
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] 131 137  
Other [Member] | LIPA OSA contract incentive component [Member]      
Revenues [Line Items]      
Anticipated Contract Revenues 10    
Eliminations [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers (609) (577)  
Revenues Unrelated to Contracts with Customers [1] 0 0  
Total Operating Revenues (609) (577)  
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 (3) (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 (126) (176)  
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 (479) (397)  
Eliminations [Member] | Other Revenues from Contracts with Customers [Member]      
Revenues [Line Items]      
Revenue from Contract with Customers [2] $ (1) $ (1)  
[1] Includes primarily alternative revenues at PSE&G, derivative contracts at 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 Power, and PSEG LI’s OSA with LIPA in Other.