Debt and Credit Facilities (Fair Value of Debt) (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
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Debt Instrument [Line Items] | ||||||
Long-term Debt | $ 15,208 | |||||
Long-term Debt, Carrying Value | 15,108 | $ 14,462 | ||||
Long-term Debt, Fair Value | 16,723 | 14,767 | ||||
PSEG [Member] | ||||||
Debt Instrument [Line Items] | ||||||
Long-term Debt | 2,450 | 2,450 | ||||
Long-term Debt, Carrying Value | 2,441 | 2,443 | ||||
Long-term Debt, Fair Value | [1],[2] | 2,479 | 2,397 | |||
Public Service Electric and Gas Company | ||||||
Debt Instrument [Line Items] | ||||||
Long-term Debt | 9,908 | 9,258 | ||||
Long-term Debt, Carrying Value | 9,827 | 9,184 | ||||
Long-term Debt, Fair Value | [2] | 11,107 | 9,374 | |||
PSEG Power LLC | ||||||
Debt Instrument [Line Items] | ||||||
Long-term Debt | 2,850 | 2,850 | ||||
Long-term Debt, Carrying Value | 2,840 | 2,835 | ||||
Long-term Debt, Fair Value | [2] | 3,137 | 2,996 | |||
Loans Payable [Member] | PSEG [Member] | ||||||
Debt Instrument [Line Items] | ||||||
Long-term Debt | $ 700 | $ 1,050 | ||||
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