Debt and Credit Facilties (Long-Term Debt) (Details) - USD ($) $ in Millions		Dec. 31, 2020		Dec. 31, 2019
Debt Instrument [Line Items]
Long-term Debt		$ 16,293
Long-term Debt, Current Maturities		(1,684)		$ (1,365)
Total Long-Term Debt		14,496		13,743
PSEG [Member]
Debt Instrument [Line Items]
Long-term Debt		2,946		2,450
Long-term Debt, Current Maturities		(300)		(700)
Net Unamortized Discount and Debt Issuance Costs		(17)		(9)
Total Long-Term Debt		2,629		1,741
PSEG [Member] | Term Loan maturing in 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt		0		700
PSEG [Member] | Variable Rate Term Loan due 2017 [Member]
Debt Instrument [Line Items]
Long-term Debt		0		700
PSEG [Member] | Senior Notes Two Point Zero Percent Due In Two Thousand Twenty One [Member] [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 300		300
Stated interest rate of debt instrument		2.00%
PSEG [Member] | Senior Notes Two Point Six Five Percent Due In Two Thousand Twenty Two [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 700		700
Stated interest rate of debt instrument		2.65%
PSEG [Member] | Senior Notes Two Point Eight Eight Percent Due In Two Thousand Twenty Four [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 750		750
Stated interest rate of debt instrument		2.88%
PSEG [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 2,946		1,750
PSEG [Member] | Senior Notes Zero Point Eight Zero Percent Due In Two Thousand Twenty Five
Debt Instrument [Line Items]
Long-term Debt		$ 550		0
Stated interest rate of debt instrument		0.80%
PSEG [Member] | Senior Notes One Point Six Zero Percent Due In Two Thousand Thirty
Debt Instrument [Line Items]
Long-term Debt		$ 550		0
Stated interest rate of debt instrument		1.60%
PSEG [Member] | Senior Notes Eight Point Six Two Five Percent Due In Two Thousand Thirty One
Debt Instrument [Line Items]
Long-term Debt		$ 96	[1]	0
Stated interest rate of debt instrument		8.63%
PSEG Power LLC
Debt Instrument [Line Items]
Long-term Debt		$ 2,348		2,850
Long-term Debt, Current Maturities		(950)		(406)
Net Unamortized Discount and Debt Issuance Costs		(6)		(10)
Total Long-Term Debt		1,392		2,434
PSEG Power LLC | Senior Notes Five Point One Three Percentage Due Two Thousand Twenty [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 0		406
Stated interest rate of debt instrument		5.13%
PSEG Power LLC | Senior Notes Four Point One Five Percentage Due Two Thousand Twenty One [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 700		700
Stated interest rate of debt instrument		3.00%
PSEG Power LLC | Senior Notes Three Point Zero Percent Due In Two Thousand Twenty One [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 250		250
Stated interest rate of debt instrument		4.15%
PSEG Power LLC | Senior Notes Three Point Eight Five Percent due Two Thousand Twenty Three [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 700		700
Stated interest rate of debt instrument		3.85%
PSEG Power LLC | Senior Notes Four Point Three Percent Due Two Thousand Twenty Three [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 250		250
Stated interest rate of debt instrument		4.30%
PSEG Power LLC | Senior Notes Eight Point Six Three Percent Due Two Thousand Thirty One [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 404	[1]	500
Stated interest rate of debt instrument		8.63%
PSEG Power LLC | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 2,304		2,806
PSEG Power LLC | Pollution Control Notes Floating Rate Due On Two Thousand Nineteen [Member]
Debt Instrument [Line Items]
Long-term Debt	[2]	44		44
PSEG Power LLC | Pollution Control Notes [Member]
Debt Instrument [Line Items]
Long-term Debt		44		44
Public Service Electric and Gas Company
Debt Instrument [Line Items]
Long-term Debt		10,999		9,908
Long-term Debt, Current Maturities		(434)		(259)
Net Unamortized Discount and Debt Issuance Costs		(90)		(81)
Total Long-Term Debt		10,475		9,568
Public Service Electric and Gas Company | First And Refunding Mortgage Bonds Nine Point Two Five Percentage Due On Two Twenty One [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 134		134
Stated interest rate of debt instrument		9.25%
Public Service Electric and Gas Company | First And Refunding Mortgage Bonds Eight Point Zero Zero Percentage Due On Two Thirty Seven [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 7		7
Stated interest rate of debt instrument		8.00%
Public Service Electric and Gas Company | First And Refunding Mortgage Bonds Five Point Zero Zero Percentage Due On Two Thirty Seven [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 8		8
Stated interest rate of debt instrument		5.00%
Public Service Electric and Gas Company | First And Refunding Mortgage Bonds [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 149		149
Public Service Electric and Gas Company | Medium Term Notes Three Point Five Zero Percentage Due On Two Thousand Twenty [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 0		250
Stated interest rate of debt instrument		3.50%
Public Service Electric and Gas Company | Medium Term Notes Seven Point Zero Four Percentage Due On Two Thousand Twenty [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 0		9
Stated interest rate of debt instrument		7.04%
Public Service Electric and Gas Company | Medium Term Notes One Point Nine Zero Percent Due In Two Thousand Twenty One [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 300		300
Stated interest rate of debt instrument		1.90%
Public Service Electric and Gas Company | Medium Term Notes Two Point Three Eight Percent Due In Two Thousand Twenty Three [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 500		500
Stated interest rate of debt instrument		2.38%
Public Service Electric and Gas Company | Medium Term Notes Three Point Two Five Percent due Two Thousand Twenty Three [Member]
Debt Instrument [Line Items]
Stated interest rate of debt instrument		3.25%
Debt Instrument, Face Amount	[3]	$ 325		325
Public Service Electric and Gas Company | Medium Term Notes Three Point Seven Five Percent Due In Two Thousand Twenty Four [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 250		250
Stated interest rate of debt instrument		3.75%
Public Service Electric and Gas Company | Medium Term Notes Three Point One Five Percent Due In Two Thousand Twenty Four [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 250		250
Stated interest rate of debt instrument		3.15%
Public Service Electric and Gas Company | Medium Term Notes Three Point Zero Five Percent Due In Two Thousand Twenty Four [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 250		250
Stated interest rate of debt instrument		3.05%
Public Service Electric and Gas Company | Medium Term Notes Three Point Zero Percent Due In Two Thousand Twenty Five [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 350		350
Stated interest rate of debt instrument		3.00%
Public Service Electric and Gas Company | Medium Term Notes Two Point Two Five Percent due Two Thousand Twenty Six [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 425		425
Stated interest rate of debt instrument		2.25%
Public Service Electric and Gas Company | Medium Term Notes Three Point Zero Percent due Two Thousand Twenty Seven [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 425		425
Stated interest rate of debt instrument		3.00%
Public Service Electric and Gas Company | Medium Term Notes Three Point Seven Zero Percent due Two Thousand Twenty Eight [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 375		375
Stated interest rate of debt instrument		3.70%
Public Service Electric and Gas Company | Medium Term Notes Three Point Six Five Percent due Two Thousand Twenty Eight [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 325		325
Stated interest rate of debt instrument		3.65%
Public Service Electric and Gas Company | Medium Term Notes Three Point Two Zero Percent due Two Thousand Twenty NIne [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 375		375
Stated interest rate of debt instrument		3.20%
Public Service Electric and Gas Company | Medium Term Notes Five Point Two Five Percentage Due On Two Thousand Thirty Five [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 250		250
Stated interest rate of debt instrument		5.25%
Public Service Electric and Gas Company | Medium Term Notes Five Point Seven Zero Percentage Due On Two Thousand Thirty Six [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 250		250
Stated interest rate of debt instrument		5.70%
Public Service Electric and Gas Company | Medium Term Notes Five Point Eight Zero Percentage Due On Two Thousand Thirty Seven [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 350		350
Stated interest rate of debt instrument		5.80%
Public Service Electric and Gas Company | Medium Term Notes Five Point Three Eight Percentage Due On Two Thousand Thirty Nine [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 250		250
Stated interest rate of debt instrument		5.38%
Public Service Electric and Gas Company | Medium Term Notes Five Point Five Zero Percentage Due On Two Thousand Forty [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 300		300
Stated interest rate of debt instrument		5.50%
Public Service Electric and Gas Company | Medium-Term Notes 3.95% Due On 2042 [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 450		450
Stated interest rate of debt instrument		3.95%
Public Service Electric and Gas Company | Medium-Term Notes 3.65% Due On 2042 [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 350		350
Stated interest rate of debt instrument		3.65%
Public Service Electric and Gas Company | Medium Term Notes Three Point Eight Zero Percent Due In Two Thousand Forty Three [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 400		400
Stated interest rate of debt instrument		3.80%
Public Service Electric and Gas Company | Medium Term Notes Four Point Zero Percent Due In Two Thousand Forty Four [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 250		250
Stated interest rate of debt instrument		4.00%
Public Service Electric and Gas Company | Medium Term Notes Four Point Zero Five Percent due Two Thousand Forty Five [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 250	[3]	250
Stated interest rate of debt instrument		4.05%
Public Service Electric and Gas Company | Medium Term Notes Four Point One Five Percent Due In Two Thousand Forty Five [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 250		250
Stated interest rate of debt instrument		4.15%
Public Service Electric and Gas Company | Medium Term Notes Three Point Eight Zero Percent due Two Thousand Forty Six [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 550		550
Stated interest rate of debt instrument		3.80%
Public Service Electric and Gas Company | Medium Term Notes Three Point Six Zero Percent due Two Thousand Forty Seven [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 350		350
Stated interest rate of debt instrument		3.60%
Public Service Electric and Gas Company | Medium Term Notes Four Point Zero Five Percent due Two Thousand Forty Eight [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 325		325
Stated interest rate of debt instrument		4.05%
Public Service Electric and Gas Company | Medium Term Notes Three Point Eight Five Percent due Two Thousand Forty Nine [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 375		375
Stated interest rate of debt instrument		3.85%
Public Service Electric and Gas Company | Medium Term Notes Three Point Two Zero Percent due Two Thousand Forty NIne [Member]
Debt Instrument [Line Items]
Long-term Debt	[3]	$ 400		400
Stated interest rate of debt instrument		3.20%
Public Service Electric and Gas Company | Total Medium Term Notes [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 10,850		9,759
Public Service Electric and Gas Company | Medium Term Notes Two Point Four Five due Two Thousand Thirty
Debt Instrument [Line Items]
Long-term Debt		$ 300		0
Stated interest rate of debt instrument		2.45%
Public Service Electric and Gas Company | Medium Term Notes 3.15% due 2050
Debt Instrument [Line Items]
Long-term Debt		$ 300		0
Stated interest rate of debt instrument		3.15%
Public Service Electric and Gas Company | Medium Term Notes 2.70% due 2050
Debt Instrument [Line Items]
Long-term Debt		$ 375		0
Stated interest rate of debt instrument		2.70%
Public Service Electric and Gas Company | Medium Term Notes 2.05% due 2050
Debt Instrument [Line Items]
Long-term Debt		$ 375		$ 0
Stated interest rate of debt instrument		2.05%

[1] In December 2020, PSEG issued $96 million principal amount of 8.63% Senior Notes due 2031 to holders of a like principal amount of 8.63% Senior Notes due 2031 originally issued by PSEG Power who validly tendered their notes pursuant to an offer to exchange. Upon consummation of the offer to exchange, the PSEG Power notes accepted in the exchange were cancelled. The transaction resulted in a non-cash financing activity for both PSEG and PSEG Power.

[2] The Pennsylvania Economic Development Financing Authority (PEDFA) bond that is serviced and secured by PSEG Power Pollution Control Notes is a variable rate bond that is in weekly reset mode.

[3] Secured by essentially all property of PSE&G pursuant to its First and Refunding Mortgage.