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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Sep. 09, 2014
Income Taxes [Line Items]
Bonus depreciation for tax purposes		50.00%
Current ITC rate for qualified property		30.00%
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority					$ 121
Income Tax Examination, Tax Expense	$ (12)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities		$ 10	$ 60	$ 0
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		$ 50	190	30
Bonus Depreciation for Tax Purposes 2018		40.00%
Bonus Depreciation for Tax Purposes 2019		30.00%
2020 ITC rate for qualified property		26.00%
2021 ITC rate for qualified property		22.00%
PSEG [Member]
Income Taxes [Line Items]
Federal income tax rate		35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes		9.00%
PSE&G [Member]
Income Taxes [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities		$ 0	32	0
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		43	92	9
Power [Member]
Income Taxes [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities		4	24	0
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		$ 6	$ 80	$ 19