Debt and Credit Facilities (Fair Value of Debt) (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term Debt		$ 14,558
Long-term Debt, Carrying Value		14,462	$ 13,068
Long-term Debt, Fair Value		14,767	14,062
PSEG [Member]
Debt Instrument [Line Items]
Long-term Debt		2,450	2,100
Long-term Debt, Carrying Value		2,443	2,091
Long-term Debt, Fair Value	[1],[2]	2,397	2,081
PSE&G
Debt Instrument [Line Items]
Long-term Debt		9,258	8,658
Long-term Debt, Carrying Value		9,184	8,591
Long-term Debt, Fair Value	[2]	9,374	9,322
Power [Member]
Debt Instrument [Line Items]
Long-term Debt		2,850	2,400
Long-term Debt, Carrying Value		2,835	2,386
Long-term Debt, Fair Value	[2]	2,996	2,659
Loans Payable [Member] | PSEG [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 1,050	$ 700

[1] As of December 31, 2018 and 2017, fair value includes floating rate term loans of $1,050 million and $700 million, respectively. 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.

[2] 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 and utilizes assumptions of current market pricing curves. In order to incorporate the credit risk into the discount rates, pricing is obtained (i.e. U.S. Treasury rate plus credit spread) based on expected new issue pricing across each of the companies’ respective debt maturity spectrum. The credit spreads of various tenors obtained from this information are added to the appropriate benchmark U.S. Treasury rates in order to determine the current market yields for the various tenors. The yields are then converted into discount rates of various tenors that are used for discounting the respective cash flows of the same tenor for each bond or note.