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Debt and Credit Facilities Debt and Credit Facilities (Tables) | 3 Months Ended
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Mar. 31, 2018
Debt and Credit Facilities [Abstract] |
Schedule of Line of Credit Facilities [Table Text Block] | Each of the credit facilities is restricted as to availability and use to the specific companies as listed in the following table; however, if necessary, the PSEG facilities can also be used to support its subsidiaries’ liquidity needs. The total credit facilities and available liquidity as of March 31, 2018 were as follows:
|  |  | As of March 31, 2018 |  |  |  |  |
| Company/Facility |  | Total Facility |  | Usage |  | Available Liquidity |  | Expiration Date |  | Primary Purpose |
|  |  | Millions |  |  |  |  |
| PSEG |  |  |  |  |  |  |  |  |  |  |
| 5-year Credit Facilities (A) |  | $ | 1,500 |  |  | $ | 609 |  |  | $ | 891 |  |  | Mar 2022 |  | Commercial Paper Support/Funding/Letters of Credit |
| Total PSEG |  | $ | 1,500 |  |  | $ | 609 |  |  | $ | 891 |  |  |  |  |  |
| PSE&G |  |  |  |  |  |  |  |  |  |  |
| 5-year Credit Facility (A) |  | $ | 600 |  |  | $ | 16 |  |  | $ | 584 |  |  | Mar 2022 |  | Commercial Paper Support/Funding/Letters of Credit |
| Total PSE&G |  | $ | 600 |  |  | $ | 16 |  |  | $ | 584 |  |  |  |  |  |
| Power |  |  |  |  |  |  |  |  |  |  |
| 3-year Letter of Credit Facilities |  | $ | 200 |  |  | $ | 112 |  |  | $ | 88 |  |  | Mar 2020 |  | Letters of Credit |
| 5-year Credit Facilities |  | 1,900 |  |  | 46 |  |  | 1,854 |  |  | Mar 2022 |  | Funding/Letters of Credit |
| Total Power |  | $ | 2,100 |  |  | $ | 158 |  |  | $ | 1,942 |  |  |  |  |  |
| Total |  | $ | 4,200 |  |  | $ | 783 |  |  | $ | 3,417 |  |  |  |  |  |
(A) | 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 Debt and Credit Facilities [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + 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(b),22(b)) -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 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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