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Debt and Credit Facilities Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Commercial Paper |  | $ 419 | $ 542
Commitments of Single Institution as Percentage of Total Commitments |  | 9.00% |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 3,638 |
Line of Credit Facility, Maximum Borrowing Capacity |  | 4,300 |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 662 |
PSE And G [Member] |  |  |
Commercial Paper |  | 40 | $ 0
Line of Credit Facility, Remaining Borrowing Capacity |  | 544 |
Line of Credit Facility, Maximum Borrowing Capacity |  | 600 |
Line of Credit Facility, Fair Value of Amount Outstanding | [1] | 56 |
Power [Member] |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 1,987 |
Line of Credit Facility, Maximum Borrowing Capacity |  | 2,200 |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 213 |
Five Year Credit Facility Maturing March 2022 [Member] | PSE And G [Member] |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 544 |
Debt Instrument, Maturity Date, Description |  | Mar 2022 |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 600 |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 56 |
Five Year Credit Facility Maturing March 2022 [Member] | Power [Member] |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 1,849 |
Debt Instrument, Maturity Date, Description |  | Mar 2022 |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 1,900 |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 51 |
Three Year Credit Facilities Maturing March 2020 [Member] | Power [Member] |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 38 |
Debt Instrument, Maturity Date, Description |  | Mar 2020 |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 100 |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 62 |
Three Year Credit Facilities Maturing September 2021 [Member] | Power [Member] |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 100 |
Debt Instrument, Maturity Date, Description |  | Sept 2021 |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 200 |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 100 |
Five Year Credit Facility Maturing March 2022 [Member] | PSE And G [Member] |  |  |
Commercial Paper |  | $ 40 |
Short-term Debt, Weighted Average Interest Rate, at Point in Time |  | 2.35% |
PSEG [Member] |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 1,107 |
Line of Credit Facility, Maximum Borrowing Capacity |  | 1,500 |
Line of Credit Facility, Fair Value of Amount Outstanding | [1] | 393 |
PSEG [Member] | Five Year Credit Facility Maturing March 2022 [Member] |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 1,107 |
Debt Instrument, Maturity Date, Description |  | Mar 2022 |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 1,500 |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 393 |
PSEG [Member] | Five Year Credit Facility Maturing March 2022 [Member] |  |  |
Commercial Paper |  | $ 379 |
Short-term Debt, Weighted Average Interest Rate, at Point in Time |  | 2.54% |
[1] | The primary use of PSEG’s and PSE&G’s credit facilities is to support their respective Commercial Paper Programs, under which as of September 30, 2018, PSEG had $379 million outstanding at a weighted average interest rate of 2.54%. PSE&G had $40 million outstanding at a weighted average interest rate of 2.35% under its Commercial Paper Program as of September 30, 2018.

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + 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(19)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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