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| 0000073088-22-000178-index.html | 2022-12-19 15:49:29 | |
| 0000073088-22-000178.txt | 2022-12-19 15:49:29 | |
 0000073088-22-000178-xbrl.zip | 98768 | 2022-12-19 15:49:29 |
| exhibit9912023annualincent.htm | 82012 | 2022-12-19 15:49:29 |
| exhibit992formof2022errpaw.htm | 34115 | 2022-12-19 15:49:29 |
| FilingSummary.xml | 1867 | 2022-12-19 15:49:29 |
| Financial_Report.xlsx | 5686 | 2022-12-19 15:49:29 |
| MetaLinks.json | 18113 | 2022-12-19 15:49:29 |
| nwe-20221213.htm | 76606 | 2022-12-19 15:49:29 |
| nwe-20221213.xsd | 2032 | 2022-12-19 15:49:29 |
 nwe-20221213_g1.jpg | 77538 | 2022-12-19 15:49:29 |
| nwe-20221213_htm.xml | 11249 | 2022-12-19 15:49:29 |
| nwe-20221213_lab.xml | 24229 | 2022-12-19 15:49:29 |
| nwe-20221213_pre.xml | 12712 | 2022-12-19 15:49:29 |
| R1.htm | 38093 | 2022-12-19 15:49:29 |
| report.css | 2767 | 2022-12-19 15:49:29 |
| Show.js | 1085 | 2022-12-19 15:49:29 |