Available-For-Sale Securities (Fair Values And Gross Unrealized Gains And Losses For The Securities) (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 1,584	$ 1,554
Gross Unrealized Gains	196	238
Gross Unrealized Losses	(26)	(12)
Fair Value	1,754	1,780
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	693	685
Gross Unrealized Gains	185	220
Gross Unrealized Losses	(13)	(8)
Fair Value	865	897
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	483	430
Gross Unrealized Gains	8	9
Gross Unrealized Losses	(3)	(1)
Fair Value	488	438
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	366	333
Gross Unrealized Gains	3	9
Gross Unrealized Losses	(10)	(3)
Fair Value	359	339
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Total Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	849	763
Gross Unrealized Gains	11	18
Gross Unrealized Losses	(13)	(4)
Fair Value	847	777
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	42	106
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	42	106
Rabbi Trust [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	204	177
Gross Unrealized Gains	11	14
Gross Unrealized Losses	(2)	0
Fair Value	213	191
Rabbi Trust [Member] \| Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	12	12
Gross Unrealized Gains	10	11
Gross Unrealized Losses	0	0
Fair Value	22	23
Rabbi Trust [Member] \| Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	108	89
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(1)	0
Fair Value	108	91
Rabbi Trust [Member] \| Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	82	74
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(1)	0
Fair Value	81	75
Rabbi Trust [Member] \| Total Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	190	163
Gross Unrealized Gains	1	3
Gross Unrealized Losses	(2)	0
Fair Value	189	166
Rabbi Trust [Member] \| Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	2	2
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	2	2
Rabbi Trust [Member] \| Power [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 52	$ 45

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

+ Details

Name:	us-gaap_AvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	pseg_AvailableForSaleSecuritiesTypeOfTrustAxis=pseg_NuclearDecommissioningTrustNdtFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=pseg_PowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_OtherDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=pseg_DebtSecuritiesTotalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=pseg_OtherSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pseg_AvailableForSaleSecuritiesTypeOfTrustAxis=pseg_RabbiTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: