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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Non cash earnings benefit from new tax legislation		$ 745
Federal income tax rate		35.00%
Provisional Deferred Tax Benefit		$ (755)	$ 0	$ 0
Bonus depreciation for tax purposes		50.00%
Current ITC rate for qualified property		30.00%
Regulatory Liabilities		$ 2,948	118
PSEG [Member]
Income Taxes [Line Items]
Federal income tax rate		35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes		9.00%
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]
Federal income tax rate		35.00%
Provisional Deferred Tax Benefit		$ (10)	0	0
Regulatory Liabilities		2,948	118
Power [Member]
Income Taxes [Line Items]
Non cash earnings benefit from new tax legislation		588
Provisional Deferred Tax Benefit		(610)	0	$ 0
Subsequent Event [Member]
Income Taxes [Line Items]
Federal income tax rate	21.00%
Subsequent Event [Member] \| PSE&G [Member]
Income Taxes [Line Items]
Federal income tax rate	21.00%
Excess Deferred Income Taxes [Member] \| PSE&G [Member]
Income Taxes [Line Items]
Reduction in Deferred Tax Liabilities		2,100
Regulatory Liabilities		$ 2,868	$ 0