Financial Risk Management Activities (Schedule Of Derivative Instruments Fair Value In Balance Sheets) (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Net Cash Collateral/Margin Postings to Counterparties	$ 393	$ 146
Derivative, Fair Value, Amount Offset Against Collateral, Net	153	44
Derivative Contracts, Current Assets	11	29
Derivative Contracts, Noncurrent Assets	1	7
Total Mark-to-Market Derivative Assets	12	36
Derivative Contracts, Current Liabilities	(11)	(16)
Derivative Contracts, Noncurrent Liabilities	(4)	(5)
Total Mark-to-Market Derivative (Liabilities)	(15)	(21)
Net Mark-to-Market Derivative Assets (Liabilities)	(3)	15
Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	11	29	[1]
Derivative Contracts, Noncurrent Assets	1	7	[1]
Total Mark-to-Market Derivative Assets	12	36	[1]
Derivative Contracts, Current Liabilities	(11)	(16)	[1]
Derivative Contracts, Noncurrent Liabilities	(4)	(5)	[1]
Total Mark-to-Market Derivative (Liabilities)	(15)	(21)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	(3)	15	[1]
Power [Member] | Netting [Member]
Derivatives, Fair Value [Line Items]
Total Mark-to-Market Derivative Assets	(551)	(433)	[1],[2]
Total Mark-to-Market Derivative (Liabilities)	704	477	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	153	44	[1],[2]
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	(2)	(3)
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	96	28
Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	62	19
Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	(3)
Energy-Related Contracts [Member] | Not Designated as Hedging Instrument [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Derivative Contracts, Current Assets	426	391	[1]
Derivative Contracts, Noncurrent Assets	137	78	[1]
Total Mark-to-Market Derivative Assets	563	469	[1]
Derivative Contracts, Current Liabilities	(521)	(403)	[1]
Derivative Contracts, Noncurrent Liabilities	(198)	(95)	[1]
Total Mark-to-Market Derivative (Liabilities)	(719)	(498)	[1]
Net Mark-to-Market Derivative Assets (Liabilities)	(156)	(29)	[1]
Energy-Related Contracts [Member] | Current Assets [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	(415)	(362)	[1],[2]
Energy-Related Contracts [Member] | Current Liabilities [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	510	387	[1],[2]
Energy-Related Contracts [Member] | Noncurrent Liabilities [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	194	90	[1],[2]
Energy-Related Contracts [Member] | Noncurrent Assets [Member] | Power [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	$ (136)	$ (71)	[1],[2]

[1] Substantially all of Power's derivative instruments are contracts subject to master netting agreements. Contracts not subject to master netting or similar agreements are immaterial and did not have any collateral posted or received as of December 31, 2018 and 2017. PSE&G does not have any derivative contracts subject to master netting or similar agreements.

[2] Represents the netting of fair value balances with the same counterparty (where the right of offset exists) and the application of collateral. All cash collateral received or posted that has been allocated to derivative positions, where the right of offset exists, has been offset on the Consolidated Balance Sheets. As of December 31, 2018 and 2017, Power had net cash collateral/margin payments to counterparties of $393 million and $146 million, respectively. Of these net cash collateral/margin payments, $153 million as of December 31, 2018 and $44 million as of December 31, 2017 were netted against the corresponding net derivative contract positions. Of the $153 million as of December 31, 2018, $(2) million was netted against current assets, $(3) million was netted against noncurrent assets, $96 million was netted against current liabilities and $62 million was netted against noncurrent liabilities. Of the $44 million as of December 31, 2017, $(3) million was netted against current assets, $28 million was netted against current liabilities and $19 million was netted against noncurrent liabilities.