Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000072909-21-000010-index-headers.html | 2021-04-29 14:00:56 | |
| 0000072909-21-000010-index.html | 2021-04-29 14:00:56 | |
| 0000072909-21-000010.txt | 2021-04-29 14:00:56 | |
 0000072909-21-000010-xbrl.zip | 178009 | 2021-04-29 14:00:56 |
| FilingSummary.xml | 25832 | 2021-04-29 14:00:56 |
| Financial_Report.xlsx | 56280 | 2021-04-29 14:00:56 |
| MetaLinks.json | 489530 | 2021-04-29 14:00:56 |
| nspw-20210331.htm | 862267 | 2021-04-29 14:00:56 |
| nspw-20210331.xsd | 36405 | 2021-04-29 14:00:56 |
| nspw-20210331_cal.xml | 77587 | 2021-04-29 14:00:56 |
| nspw-20210331_def.xml | 151728 | 2021-04-29 14:00:56 |
| nspw-20210331_htm.xml | 786400 | 2021-04-29 14:00:56 |
| nspw-20210331_lab.xml | 452170 | 2021-04-29 14:00:56 |
| nspw-20210331_pre.xml | 275132 | 2021-04-29 14:00:56 |
| nspwex3101q12021.htm | 10710 | 2021-04-29 14:00:56 |
| nspwex3102q12021.htm | 10696 | 2021-04-29 14:00:56 |
| nspwex3201q12021.htm | 8820 | 2021-04-29 14:00:56 |
| R1.htm | 47289 | 2021-04-29 14:00:56 |
| R10.htm | 32027 | 2021-04-29 14:00:56 |
| R11.htm | 46767 | 2021-04-29 14:00:56 |
| R12.htm | 35735 | 2021-04-29 14:00:56 |
| R13.htm | 36167 | 2021-04-29 14:00:56 |
| R14.htm | 23330 | 2021-04-29 14:00:56 |
| R15.htm | 17152 | 2021-04-29 14:00:56 |
| R16.htm | 25529 | 2021-04-29 14:00:56 |
| R17.htm | 32547 | 2021-04-29 14:00:56 |
| R18.htm | 32879 | 2021-04-29 14:00:56 |
| R19.htm | 43687 | 2021-04-29 14:00:56 |
| R2.htm | 57896 | 2021-04-29 14:00:56 |
| R20.htm | 35103 | 2021-04-29 14:00:56 |
| R21.htm | 25459 | 2021-04-29 14:00:56 |
| R22.htm | 20107 | 2021-04-29 14:00:56 |
| R23.htm | 19971 | 2021-04-29 14:00:56 |
| R24.htm | 10043 | 2021-04-29 14:00:56 |
| R25.htm | 12679 | 2021-04-29 14:00:56 |
| R26.htm | 19235 | 2021-04-29 14:00:56 |
| R27.htm | 33428 | 2021-04-29 14:00:56 |
| R28.htm | 12622 | 2021-04-29 14:00:56 |
| R29.htm | 14030 | 2021-04-29 14:00:56 |
| R3.htm | 83858 | 2021-04-29 14:00:56 |
| R30.htm | 8596 | 2021-04-29 14:00:56 |
| R31.htm | 53283 | 2021-04-29 14:00:56 |
| R32.htm | 26592 | 2021-04-29 14:00:56 |
| R33.htm | 14418 | 2021-04-29 14:00:56 |
| R34.htm | 6571 | 2021-04-29 14:00:56 |
| R35.htm | 10816 | 2021-04-29 14:00:56 |
| R36.htm | 27110 | 2021-04-29 14:00:56 |
| R37.htm | 9580 | 2021-04-29 14:00:56 |
| R38.htm | 30714 | 2021-04-29 14:00:56 |
| R39.htm | 5856 | 2021-04-29 14:00:56 |
| R4.htm | 120474 | 2021-04-29 14:00:56 |
| R40.htm | 28080 | 2021-04-29 14:00:56 |
| R41.htm | 5820 | 2021-04-29 14:00:56 |
| R42.htm | 27573 | 2021-04-29 14:00:56 |
| R5.htm | 30261 | 2021-04-29 14:00:56 |
| R6.htm | 7962 | 2021-04-29 14:00:56 |
| R7.htm | 5109 | 2021-04-29 14:00:56 |
| R8.htm | 12906 | 2021-04-29 14:00:56 |
| R9.htm | 28398 | 2021-04-29 14:00:56 |
| report.css | 2767 | 2021-04-29 14:00:56 |
| Show.js | 1085 | 2021-04-29 14:00:56 |