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Stock-based Compensation Expense Restricted and Performance Stock Unit activity (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures [Abstract] |
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] | Pursuant to the Portland General Electric Company Stock Incentive Plan as amended and restated effective February 13, 2018 (the Plan), the Company may grant a variety of equity-based awards, including restricted stock units (RSUs) with time-based vesting conditions (time-based RSUs) and performance-based vesting conditions (performance-based RSUs), to non-employee directors, officers, or certain key employees. RSU activity is summarized in the following table:
| Units |  | Weighted Average Grant Date Fair Value
Nonvested units as of December 31, 2016 | 458,792 |  |  | $ | 34.68 |
Granted | 202,145 |  |  | 41.96 |
Forfeited | (64,840 | ) |  | 39.57 |
Vested | (196,721 | ) |  | 31.78 |
Nonvested units as of December 31, 2017 | 399,376 |  |  | 37.98 |
Granted | 198,864 |  |  | 37.99 |
Forfeited | (8,556 | ) |  | 39.73 |
Vested | (160,771 | ) |  | 36.77 |
Nonvested units of December 31, 2018 | 428,913 |  |  | 38.43 |
Granted | 210,555 |  |  | 49.06 |
Forfeited | (9,041 | ) |  | 41.68 |
Vested | (167,037 | ) |  | 37.52 |
Nonvested units as of December 31, 2019 | 463,390 |  |  | 43.52 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | with the following weighted average assumptions:
| 2019 |  | 2018 |  | 2017
Risk-free interest rate |  |  | 2.5 | % |  |  |  | 2.4 | % |  |  |  | 1.5 | %
Expected term (in years) |  |  | 3.0 |  |  |  | 3.0 |  |  |  | 3.0
Volatility | 14.8 | % | - | 74.5 | % |  | 14.7 | % | - | 21.8 | % |  | 15.6 | % | - | 22.9 | %

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&loc=d3e5070-113901 + Details
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