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Long-Term Investments (Equity Method Investments) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Long-Term Investments [Line Items] |  |  |  |
Long-Term Investments |  | $ 812 |  | $ 896
Keystone [Member] |  |  |  |
Long-Term Investments [Line Items] |  |  |  |
Location of the affiliated companies, equity method investments |  | PA |  |
Owned percentage |  | 23.00% |  |
Conemaugh [Member] |  |  |  |
Long-Term Investments [Line Items] |  |  |  |
Location of the affiliated companies, equity method investments |  | PA |  |
Owned percentage |  | 23.00% |  |
Kalaeloa [Member] |  |  |  |
Long-Term Investments [Line Items] |  |  |  |
Location of the affiliated companies, equity method investments |  | HI |  |
Owned percentage |  | 50.00% |  |
PSEG Power LLC |  |  |  |
Long-Term Investments [Line Items] |  |  |  |
Long-Term Investments |  | $ 66 |  | 86
Partnerships And Corporate Joint Ventures [Member] | PSEG Power LLC |  |  |  |
Long-Term Investments [Line Items] |  |  |  |
Long-Term Investments | [1] | 66 |  | 86
Partnerships And Corporate Joint Ventures [Member] | PSEG Power LLC | Keystone [Member] |  |  |  |
Long-Term Investments [Line Items] |  |  |  |
Long-Term Investments |  | 0 | [2] | 9
Partnerships And Corporate Joint Ventures [Member] | PSEG Power LLC | Conemaugh [Member] |  |  |  |
Long-Term Investments [Line Items] |  |  |  |
Long-Term Investments |  | 0 | [2] | 8
Partnerships And Corporate Joint Ventures [Member] | PSEG Power LLC | Kalaeloa [Member] |  |  |  |
Long-Term Investments [Line Items] |  |  |  |
Long-Term Investments |  | $ 66 |  | $ 69
[1] | During the three years ended December 31, 2019, 2018 and 2017, dividends from these investments were $15 million, $16 million and $18 million, respectively.
[2] | In September 2019, PSEG Power completed the sale of its ownership interests in the Keystone and Conemaugh generation plants and related assets and liabilities.

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