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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of Share-based Payment Award, Valuation Assumptions [Table Text Block] | PSEG recognizes compensation expense for the total shareholder return (TSR) target for its PSU awards based on the grant date fair values of the award, which are determined using the Monte Carlo model. The following table provides the assumptions used to calculate the grant date fair value of the TSR portion of the PSU awards for 2020, 2019 and 2018:
| Grant Date |  | Risk-Free Interest Rate |  | Volatility |
| February 18, 2020 |  | 1.36% |  | 15.00% |
| February 19, 2019 |  | 2.47% |  | 16.74% |
| February 20, 2018 |  | 2.36% |  | 17.57% |
Share Based Compensation Impacts |
|  |  | 2020 |  | 2019 |  | 2018 |
|  |  | Millions |
| Compensation Cost included in O&M Expense |  | $ | 35 |  |  | $ | 33 |  |  | $ | 30 |  |
| Income Tax Benefit Recognized in Consolidated Statement of Operations |  | $ | 10 |  |  | $ | 9 |  |  | $ | 9 |  |
Activity For Options Exercised | Activity for options exercised for the years ended December 31, 2020, 2019 and 2018 is shown below:
|  |  | 2020 |  | 2019 |  | 2018 |
|  |  | Millions |
| Total Intrinsic Value of Options Exercised |  | $ | — |  |  | $ | 5 |  |  | $ | 2 |  |
| Cash Received from Options Exercised |  | $ | — |  |  | $ | 8 |  |  | $ | 4 |  |
| Tax Benefit Realized from Options Exercised |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |
Restricted Stock Units Activity | Changes in RSUs for the year ended December 31, 2020 are summarized as follows:
|  |  | Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Years Contractual Term |  | Aggregate Intrinsic Value |
| Non-vested as of January 1, 2020 |  | 214,981 |  |  | $ | 50.41 |  |  |  |  |  |
| Granted |  | 219,749 |  |  | $ | 58.85 |  |  |  |  |  |
| Vested |  | 203,032 |  |  | $ | 55.20 |  |  |  |  |  |
| Canceled/Forfeited |  | 8,800 |  |  | $ | 54.13 |  |  |  |  |  |
| Non-vested as of December 31, 2020 |  | 222,898 |  |  | $ | 54.21 |  |  | 0.9 |  | $ | 12,994,953 |  |
Performance Units Information | Changes in PSUs for the year ended December 31, 2020 are summarized as follows:
|  |  | Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Years Contractual Term |  | Aggregate Intrinsic Value |
| Non-vested as of January 1, 2020 |  | 334,515 |  |  | $ | 59.30 |  |  |  |  |  |
| Granted |  | 447,815 |  |  | $ | 51.79 |  |  |  |  |  |
| Vested |  | 285,977 |  |  | $ | 54.96 |  |  |  |  |  |
| Canceled/Forfeited |  | 20,512 |  |  | $ | 58.37 |  |  |  |  |  |
| Non-vested as of December 31, 2020 |  | 475,841 |  |  | $ | 54.88 |  |  | 1.7 |  | $ | 27,741,530 |  |

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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding performance-based awards that are fully vested and expected to vest. Includes, but is not limited to, unvested awards for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding restricted stock units that are fully vested and expected to vest. Includes, but is not limited to, unvested restricted stock units for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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