Debt and Credit Facilities (Fair Value of Debt) (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term Debt		$ 16,293
Long-term Debt, Carrying Value		16,180	$ 15,108
Long-term Debt, Fair Value		19,143	16,723
PSEG [Member]
Debt Instrument [Line Items]
Long-term Debt		2,946	2,450
Long-term Debt, Carrying Value		2,929	2,441
Long-term Debt, Fair Value	[1],[2]	3,092	2,479
Public Service Electric and Gas Company
Debt Instrument [Line Items]
Long-term Debt		10,999	9,908
Long-term Debt, Carrying Value		10,909	9,827
Long-term Debt, Fair Value	[1]	13,372	11,107
PSEG Power LLC
Debt Instrument [Line Items]
Long-term Debt		2,348	2,850
Long-term Debt, Carrying Value		2,342	2,840
Long-term Debt, Fair Value	[1]	2,679	3,137
Loans Payable [Member] | PSEG [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 0	$ 700

[1] Given that these bonds do not trade actively, the fair value amounts of taxable debt securities (primarily Level 2 measurements) are generally determined by a valuation model that is based on a conventional discounted cash flow methodology. The fair value amounts above do not represent the price at which the outstanding debt may be called for redemption by each issuer under their respective debt agreements.

[2] Includes a floating-rate term loan of $700 million at PSEG as of December 31, 2019. The fair value of the term loan debt (Level 2 measurement) approximates the carrying value because the interest payments are based on LIBOR rates that are reset monthly and the debt is redeemable at face value by PSEG at any time.