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Revenues Revenues (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
$ / mwd
MW
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
$ / mwd
MW
Jun. 30, 2018
USD ($)
Revenues [Line Items]        
Revenue from Contract with Customers $ 1,992 $ 1,962 $ 4,778 $ 4,606
Revenues Unrelated to Contracts with Customers [1] 324 54 518 228
Total Operating Revenues 2,316 2,016 5,296 4,834
Electric Distribution Contracts [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 775 754 1,517 1,444
Gas Distribution [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 208 244 1,136 1,000
Electric Transmission [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 304 301 592 613
Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 423 373 938 871
Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 0 0 0 0
Electricity and Related Products [Member] | NY ISO [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 29 46 70 105
Electricity and Related Products [Member] | ISO New England [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 27 14 48 61
Gas Sales [Member] | Third Party Sales [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 11 30 58 94
Gas Sales [Member] | Sales to Affiliates [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 0 0 0 0
Other Revenues from Contracts with Customers [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers [2] $ 215 200 $ 419 418
Public Service Electric and Gas Company [Member]        
Revenues [Line Items]        
Allowances percentage of accounts receivable 7.00%   7.00%  
Revenue from Contract with Customers $ 1,358 1,366 $ 3,383 3,199
Revenues Unrelated to Contracts with Customers [1] 24 20 31 32
Total Operating Revenues 1,382 1,386 3,414 3,231
Public Service Electric and Gas Company [Member] | Electric Distribution Contracts [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 775 754 1,517 1,444
Public Service Electric and Gas Company [Member] | Gas Distribution [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 211 248 1,142 1,007
Public Service Electric and Gas Company [Member] | Electric Transmission [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 304 301 592 613
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 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 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 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 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 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 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] 68 63 132 135
PSEG Power [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 736 731 1,975 1,982
Revenues Unrelated to Contracts with Customers [1] 347 36 524 188
Total Operating Revenues 1,083 767 2,499 2,170
Anticipated Contract Revenues $ 170   $ 170  
PSEG Power [Member] | PJM [Member] | June 2019 to May 2020 [Member]        
Revenues [Line Items]        
Dollars Per Megawatt-Day | $ / mwd 115   115  
Load (MW) | MW 9,000   9,000  
PSEG Power [Member] | PJM [Member] | June 2020 to May 2021 [Member]        
Revenues [Line Items]        
Dollars Per Megawatt-Day | $ / mwd 170   170  
Load (MW) | MW 8,100   8,100  
PSEG Power [Member] | PJM [Member] | June 2021 to May 2022 [Member]        
Revenues [Line Items]        
Dollars Per Megawatt-Day | $ / mwd 178   178  
Load (MW) | MW 7,700   7,700  
PSEG Power [Member] | ISO New England [Member] | June 2019 to May 2020 [Member]        
Revenues [Line Items]        
Dollars Per Megawatt-Day | $ / mwd 231   231  
Load (MW) | MW 1,330   1,330  
PSEG Power [Member] | ISO New England [Member] | June 2020 to May 2021 [Member]        
Revenues [Line Items]        
Dollars Per Megawatt-Day | $ / mwd 195   195  
Load (MW) | MW 1,330   1,330  
PSEG Power [Member] | ISO New England [Member] | June 2021 to May 2022 [Member]        
Revenues [Line Items]        
Dollars Per Megawatt-Day | $ / mwd 192   192  
Load (MW) | MW 950   950  
PSEG Power [Member] | ISO New England [Member] | June 2022 to May 2023 [Member]        
Revenues [Line Items]        
Dollars Per Megawatt-Day | $ / mwd 179   179  
Load (MW) | MW 950   950  
PSEG Power [Member] | ISO New England [Member] | June 2023 to May 2024 [Member]        
Revenues [Line Items]        
Dollars Per Megawatt-Day | $ / mwd 231   231  
Load (MW) | MW 480   480  
PSEG Power [Member] | ISO New England [Member] | June 2024 to May 2025 [Member]        
Revenues [Line Items]        
Dollars Per Megawatt-Day | $ / mwd 231   231  
Load (MW) | MW 480   480  
PSEG Power [Member] | ISO New England [Member] | June 2025 to May 2026 [Member]        
Revenues [Line Items]        
Dollars Per Megawatt-Day | $ / mwd 231   231  
Load (MW) | MW 480   480  
PSEG Power [Member] | Electric Distribution Contracts [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers $ 0 0 $ 0 0
PSEG Power [Member] | Gas Distribution [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 0 0 0 0
PSEG Power [Member] | Electric Transmission [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 0 0 0 0
PSEG Power [Member] | Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 423 373 938 871
PSEG Power [Member] | Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 130 147 256 323
PSEG Power [Member] | Electricity and Related Products [Member] | NY ISO [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 29 46 70 105
PSEG Power [Member] | Electricity and Related Products [Member] | ISO New England [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 27 14 48 61
PSEG Power [Member] | Gas Sales [Member] | Third Party Sales [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 11 30 58 94
PSEG Power [Member] | Gas Sales [Member] | Sales to Affiliates [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 102 108 581 505
PSEG Power [Member] | Other Revenues from Contracts with Customers [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers [2] 14 13 24 23
Other [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 134 125 265 262
Revenues Unrelated to Contracts with Customers [1] (47) (2) (37) 8
Total Operating Revenues 87 123 228 270
Other [Member] | LIPA OSA contract fixed component [Member]        
Revenues [Line Items]        
Anticipated Contract Revenues 65   65  
Other [Member] | Electric Distribution Contracts [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 0 0 0 0
Other [Member] | Gas Distribution [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 0 0 0 0
Other [Member] | Electric Transmission [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 0 0 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 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 0 0
Other [Member] | Electricity and Related Products [Member] | NY ISO [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 0 0 0 0
Other [Member] | Electricity and Related Products [Member] | ISO New England [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 0 0 0 0
Other [Member] | Gas Sales [Member] | Third Party Sales [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 0 0 0 0
Other [Member] | Gas Sales [Member] | Sales to Affiliates [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 0 0 0 0
Other [Member] | Other Revenues from Contracts with Customers [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers [2] 134 125 265 262
Other [Member] | LIPA OSA contract incentive component [Member]        
Revenues [Line Items]        
Anticipated Contract Revenues 10   10  
Eliminations [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers (236) (260) (845) (837)
Revenues Unrelated to Contracts with Customers [1] 0 0 0 0
Total Operating Revenues (236) (260) (845) (837)
Eliminations [Member] | Electric Distribution Contracts [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 0 0 0 0
Eliminations [Member] | Gas Distribution [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers (3) (4) (6) (7)
Eliminations [Member] | Electric Transmission [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 0 0 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 0 0
Eliminations [Member] | Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers (130) (147) (256) (323)
Eliminations [Member] | Electricity and Related Products [Member] | NY ISO [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 0 0 0 0
Eliminations [Member] | Electricity and Related Products [Member] | ISO New England [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 0 0 0 0
Eliminations [Member] | Gas Sales [Member] | Third Party Sales [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers 0 0 0 0
Eliminations [Member] | Gas Sales [Member] | Sales to Affiliates [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers (102) (108) (581) (505)
Eliminations [Member] | Other Revenues from Contracts with Customers [Member]        
Revenues [Line Items]        
Revenue from Contract with Customers [2] $ (1) $ (1) $ (2) $ (2)
[1]
Includes primarily alternative revenues at PSE&G, derivative 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.