S000001112 [Member] Performance Management - Government Portfolio |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | The following bar chart and table show the performance of the Government Portfolio and indicate the risks of investing in the Portfolio by showing the historical return variability associated with an investment in the Portfolio. The bar chart shows how the annual total returns of the Portfolio have varied from year to year for the last ten years. The table shows the Portfolio’s average annual total returns for one-, five-and ten-year periods ended December 31, 2025. The bar chart and the table assume reinvestment of dividends and distributions. The past performance of the Government Portfolio does not necessarily indicate how it will perform in the future. Updated performance information is available at www.pif.com or by calling (800) 621-9215.
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| Performance Past Does Not Indicate Future [Text] | The past performance of the Government Portfolio does not necessarily indicate how it will perform in the future. |
| Performance Information Illustrates Variability of Returns [Text] | The following bar chart and table show the performance of the Government Portfolio and indicate the risks of investing in the Portfolio by showing the historical return variability associated with an investment in the Portfolio. |
| Bar Chart [Heading] | Government Portfolio Annual Returns for Each Year |
| Bar Chart Closing [Text Block] | During the period shown in the bar chart, the highest quarterly return for the Government Portfolio was 1.34% (for the quarter ended December 31, 2023) and the lowest quarterly return was 0.00% (for the quarter ended September 30, 2021).
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| Performance Table Heading | Average Annual Total Returns(for the periods ended December 31, 2025): |
| Performance Table Closing [Text Block] | The Government Portfolio seven-day average yield as of December 31, 2025 was 3.98%. You may obtain this Portfolio’s current seven-day yield by visiting the Fund’s website at www.pif.com or by calling (800) 621-9215.
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| Money Market Seven Day Yield, Caption [Optional Text] | The Government Portfolio seven-day average yield as of December 31, 2025 was |
| Money Market Seven Day Yield Phone | (800) 621-9215 |
| Money Market Seven Day Yield | 3.98% |
| Performance Availability Website Address [Text] | www.pif.com |
| Performance Availability Phone [Text] | (800) 621-9215 |
| Government Portfolio | |
| Prospectus [Line Items] | |
| Highest Quarterly Return, Label [Optional Text] | highest quarterly return |
| Highest Quarterly Return | 1.34% |
| Highest Quarterly Return, Date | Dec. 31, 2023 |
| Lowest Quarterly Return, Label [Optional Text] | lowest quarterly return |
| Lowest Quarterly Return | none |
| Lowest Quarterly Return, Date | Sep. 30, 2021 |