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Debt and Credit Facilities Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Commercial Paper |  | $ 594 | $ 542
Commitments of Single Institution as Percentage of Total Commitments |  | 8.00% |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 3,417 |
Line of Credit Facility, Maximum Borrowing Capacity |  | 4,200 |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 783 |
PSE And G [Member] |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 584 |
Line of Credit Facility, Maximum Borrowing Capacity |  | 600 |
Line of Credit Facility, Fair Value of Amount Outstanding | [1] | 16 |
Power [Member] |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 1,942 |
Line of Credit Facility, Maximum Borrowing Capacity |  | 2,100 |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 158 |
Five Year Credit Facility Maturing March 2022 [Member] | PSE And G [Member] |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 584 |
Debt Instrument, Maturity Date, Description |  | Mar 2022 |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 600 |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 16 |
Five Year Credit Facility Maturing March 2022 [Member] | Power [Member] |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 1,854 |
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 |  | 46 |
Three Year Credit Facilities Maturing March 2020 [Member] | Power [Member] |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 88 |
Debt Instrument, Maturity Date, Description |  | Mar 2020 |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 200 |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 112 |
PSEG [Member] |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 891 |
Line of Credit Facility, Maximum Borrowing Capacity |  | 1,500 |
Line of Credit Facility, Fair Value of Amount Outstanding | [1] | 609 |
PSEG [Member] | Five Year Credit Facility Maturing March 2022 [Member] |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 891 |
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 |  | 609 |
PSEG [Member] | Five Year Credit Facility Maturing March 2022 [Member] |  |  |
Commercial Paper |  | $ 594 |
Short-term Debt, Weighted Average Interest Rate, at Point in Time |  | 2.57% |
[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 March 31, 2018, PSEG had $594 million outstanding at a weighted average interest rate of 2.57%. PSE&G had no amounts outstanding under its Commercial Paper Program as of March 31, 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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