Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 4,200
Line of Credit Facility, Amount Outstanding		1,201
Available Liquidity		2,999
Commercial Paper and Loans		$ 1,016	$ 542
Commitments of single institution as percentage of total commitments		9.00%
PSEG [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,500
Line of Credit Facility, Amount Outstanding		759
Available Liquidity		741
PSE&G [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		600
Line of Credit Facility, Amount Outstanding		288
Available Liquidity		312
Commercial Paper and Loans		272	$ 0
Power [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		2,100
Line of Credit Facility, Amount Outstanding		154
Available Liquidity		1,946
Revolving Credit Facility [Member] | PSEG [Member]
Short-term Debt [Line Items]
Commercial Paper and Loans		$ 744
Short-term Debt, Weighted Average Interest Rate, at Point in Time		2.95%
Revolving Credit Facility [Member] | PSE&G [Member]
Short-term Debt [Line Items]
Commercial Paper and Loans		$ 272
Short-term Debt, Weighted Average Interest Rate, at Point in Time		2.96%
Letter of Credit Facilities expiring September 2021 [Member] | Power [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 200
Line of Credit Facility, Amount Outstanding		114
Available Liquidity		$ 86
Expiration Date		Sept 2021
Revolving Credit Facility [Member] | PSEG [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 1,500
Line of Credit Facility, Amount Outstanding	[1]	759
Available Liquidity	[1]	$ 741
Expiration Date		Mar 2022
Revolving Credit Facility [Member] | PSE&G [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 600
Line of Credit Facility, Amount Outstanding	[1]	288
Available Liquidity	[1]	$ 312
Expiration Date		Mar 2022
Revolving Credit Facility [Member] | Power [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,900
Line of Credit Facility, Amount Outstanding		40
Available Liquidity		$ 1,860
Expiration Date		Mar 2022

[1] The primary use of PSEG’s and PSE&G’s credit facilities is to support their respective Commercial Paper Programs under which as of December 31, 2018, PSEG had $744 million outstanding at a weighted average interest rate of 2.95%. PSE&G had $272 million outstanding at a weighted average interest rate of 2.96% under its Commercial Paper Program as of December 31, 2018.