XML 113 R79.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Available-For-Sale Securities (Value Of Securities That Have Been In An Unrealized Loss Position For Less Than And Greater Than 12 Months) (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] |  |  |
Fair Value, Less Than 12 Months |  | $ 618 | $ 356
Gross Unrealized Losses, Less than 12 Months |  | (22) | (9)
Fair Value, Greater Than 12 Months |  | 56 | 59
Gross Unrealized Losses, Greater Than 12 Months |  | (4) | (3)
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value, Less Than 12 Months | [1] | 151 | 162
Gross Unrealized Losses, Less than 12 Months | [1] | (13) | (8)
Fair Value, Greater Than 12 Months | [1] | 1 | 1
Gross Unrealized Losses, Greater Than 12 Months | [1] | 0 | 0
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value, Less Than 12 Months | [2] | 245 | 95
Gross Unrealized Losses, Less than 12 Months | [2] | (2) | 0
Fair Value, Greater Than 12 Months | [2] | 19 | 28
Gross Unrealized Losses, Greater Than 12 Months | [2] | (1) | (1)
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Other Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value, Less Than 12 Months | [3] | 222 | 99
Gross Unrealized Losses, Less than 12 Months | [3] | (7) | (1)
Fair Value, Greater Than 12 Months | [3] | 36 | 30
Gross Unrealized Losses, Greater Than 12 Months | [3] | (3) | (2)
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Total Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value, Less Than 12 Months |  | 467 | 194
Gross Unrealized Losses, Less than 12 Months |  | (9) | (1)
Fair Value, Greater Than 12 Months |  | 55 | 58
Gross Unrealized Losses, Greater Than 12 Months |  | (4) | (3)
Rabbi Trust [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value, Less Than 12 Months |  | 99 | 26
Gross Unrealized Losses, Less than 12 Months |  | (2) | 0
Fair Value, Greater Than 12 Months |  | 11 | 0
Gross Unrealized Losses, Greater Than 12 Months |  | 0 | 0
Rabbi Trust [Member] | Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value, Less Than 12 Months | [4] | 0 | 0
Gross Unrealized Losses, Less than 12 Months | [4] | 0 | 0
Fair Value, Greater Than 12 Months | [4] | 0 | 0
Gross Unrealized Losses, Greater Than 12 Months | [4] | 0 | 0
Rabbi Trust [Member] | Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value, Less Than 12 Months | [5] | 53 | 2
Gross Unrealized Losses, Less than 12 Months | [5] | (1) | 0
Fair Value, Greater Than 12 Months | [5] | 2 | 0
Gross Unrealized Losses, Greater Than 12 Months | [5] | 0 | 0
Rabbi Trust [Member] | Other Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value, Less Than 12 Months | [6] | 46 | 24
Gross Unrealized Losses, Less than 12 Months | [6] | (1) | 0
Fair Value, Greater Than 12 Months | [6] | 9 | 0
Gross Unrealized Losses, Greater Than 12 Months | [6] | $ 0 | $ 0
[1] | Equity Securities—Investments in marketable equity securities within the NDT Fund are primarily in common stocks within a broad range of industries and sectors. The unrealized losses are distributed over companies with limited impairment durations. Power does not consider these securities to be other-than-temporarily impaired as of December 31, 2015.
[2] | Debt Securities (Government)—Unrealized losses on Power’s NDT investments in U.S. Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. Since these investments are guaranteed by the U.S. government or an agency of the U.S. government, it is not expected that these securities will settle for less than their amortized cost basis, since Power does not intend to sell nor will it be more-likely-than-not required to sell. Power does not consider these securities to be other-than-temporarily impaired as of December 31, 2015.
[3] | Debt Securities (Corporate)—Power’s investments in corporate bonds are primarily in investment grade securities. It is not expected that these securities would settle for less than their amortized cost. Since Power does not intend to sell these securities nor will it be more-likely-than-not required to sell, Power does not consider these debt securities to be other-than-temporarily impaired as of December 31, 2015.
[4] | Equity Securities—Investments in marketable equity securities within the Rabbi Trust Fund is through a mutual fund which invests primarily in common stocks within a broad range of industries and sectors.
[5] | Debt Securities (Government)—Unrealized losses on PSEG’s Rabbi Trust investments in U.S. Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. Since these investments are guaranteed by the U.S. government or an agency of the U.S. government, it is not expected that these securities will settle for less than their amortized cost basis, since PSEG does not intend to sell nor will it be more-likely-than-not required to sell. PSEG does not consider these securities to be other-than-temporarily impaired as of December 31, 2015.
[6] | Debt Securities (Corporate)—PSEG’s investments in corporate bonds are primarily in investment grade securities. It is not expected that these securities would settle for less than their amortized cost. Since PSEG does not intend to sell these securities nor will it be more-likely-than-not required to sell, PSEG does not consider these debt securities to be other-than-temporarily impaired as of December 31, 2015.

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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

X
- Details
Name: | pseg_AvailableForSaleSecuritiesTypeOfTrustAxis=pseg_NuclearDecommissioningTrustNdtFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=pseg_PowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

X
- Details
Name: | pseg_AvailableForSaleSecuritiesTypeOfTrustAxis=pseg_RabbiTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |