Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Non cash earnings benefit from new tax legislation		$ 745
Federal income tax rate	21.00%	35.00%
Provisional Deferred Tax Benefit	$ 3	$ (755)	$ 0
Bonus depreciation for tax purposes	50.00%
Current ITC rate for qualified property	30.00%
Regulatory Liabilities	$ 3,221	2,948
Revenue impact of additional excess deferred taxes	46
Deferred Tax Assets, interest disallowance	$ 54
NJ surcharge tax percent for 2018 to 2019	3.00%
NJ tax surcharge percent for 2020 to 2021	2.00%
NJ tax surcharge expense	$ 7
PSEG [Member]
Income Taxes [Line Items]
Federal income tax rate	21.00%
Energy Holdings [Member]
Income Taxes [Line Items]
Non cash earnings benefit from new tax legislation		147
Provisional Deferred Tax Benefit		(149)
PSE&G [Member]
Income Taxes [Line Items]
Provisional Deferred Tax Benefit	$ 0	(10)	0
Regulatory Liabilities	3,221	2,948
NOL Carryforwards	21
Power [Member]
Income Taxes [Line Items]
Non cash earnings benefit from new tax legislation		588
Provisional Deferred Tax Benefit	(1)	(610)	$ 0
Deferred Tax Assets, interest disallowance	8
NOL Carryforwards	14
Excess Deferred Income Taxes [Member] | PSE&G [Member]
Income Taxes [Line Items]
Reduction in Deferred Tax Liabilities		2,100
Regulatory Liabilities	3,170	$ 2,868
Additional Excess Deferred Taxes	$ 34