Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000051434-21-000012-index-headers.html | 2021-02-19 13:23:31 | |
| 0000051434-21-000012-index.html | 2021-02-19 13:23:31 | |
| 0000051434-21-000012.txt | 2021-02-19 13:23:31 | |
 0000051434-21-000012-xbrl.zip | 1117441 | 2021-02-19 13:23:31 |
| FilingSummary.xml | 97104 | 2021-02-19 13:23:31 |
| Financial_Report.xlsx | 243201 | 2021-02-19 13:23:31 |
| ip-20201231.htm | 5023540 | 2021-02-19 13:23:31 |
| ip-20201231.xsd | 123294 | 2021-02-19 13:23:31 |
| ip-20201231exhibit21.htm | 93272 | 2021-02-19 13:23:31 |
| ip-20201231exhibit23.htm | 2948 | 2021-02-19 13:23:31 |
| ip-20201231exhibit311.htm | 9421 | 2021-02-19 13:23:31 |
| ip-20201231exhibit312.htm | 9704 | 2021-02-19 13:23:31 |
| ip-20201231exhibit32.htm | 5555 | 2021-02-19 13:23:31 |
| ip-20201231_cal.xml | 204091 | 2021-02-19 13:23:31 |
| ip-20201231_def.xml | 982055 | 2021-02-19 13:23:31 |
 ip-20201231_g1.jpg | 74027 | 2021-02-19 13:23:31 |
 ip-20201231_g2.jpg | 113533 | 2021-02-19 13:23:31 |
 ip-20201231_g3.jpg | 187688 | 2021-02-19 13:23:31 |
 ip-20201231_g4.jpg | 104516 | 2021-02-19 13:23:31 |
 ip-20201231_g5.jpg | 9127 | 2021-02-19 13:23:31 |
| ip-20201231_htm.xml | 5736963 | 2021-02-19 13:23:31 |
| ip-20201231_lab.xml | 1432603 | 2021-02-19 13:23:31 |
| ip-20201231_pre.xml | 1201791 | 2021-02-19 13:23:31 |
| MetaLinks.json | 1462629 | 2021-02-19 13:23:31 |
| R1.htm | 58160 | 2021-02-19 13:23:31 |
| R10.htm | 36937 | 2021-02-19 13:23:31 |
| R100.htm | 94169 | 2021-02-19 13:23:31 |
| R101.htm | 14113 | 2021-02-19 13:23:31 |
| R102.htm | 94402 | 2021-02-19 13:23:31 |
| R103.htm | 18850 | 2021-02-19 13:23:31 |
| R104.htm | 4788 | 2021-02-19 13:23:31 |
| R105.htm | 12820 | 2021-02-19 13:23:31 |
| R106.htm | 35722 | 2021-02-19 13:23:31 |
| R107.htm | 31328 | 2021-02-19 13:23:31 |
| R108.htm | 19784 | 2021-02-19 13:23:31 |
| R109.htm | 17472 | 2021-02-19 13:23:31 |
| R11.htm | 15765 | 2021-02-19 13:23:31 |
| R110.htm | 23601 | 2021-02-19 13:23:31 |
| R111.htm | 16355 | 2021-02-19 13:23:31 |
| R112.htm | 76432 | 2021-02-19 13:23:31 |
| R113.htm | 19595 | 2021-02-19 13:23:31 |
| R114.htm | 14514 | 2021-02-19 13:23:31 |
| R115.htm | 23672 | 2021-02-19 13:23:31 |
| R116.htm | 14739 | 2021-02-19 13:23:31 |
| R117.htm | 35066 | 2021-02-19 13:23:31 |
| R118.htm | 21173 | 2021-02-19 13:23:31 |
| R119.htm | 7560 | 2021-02-19 13:23:31 |
| R12.htm | 170168 | 2021-02-19 13:23:31 |
| R120.htm | 26551 | 2021-02-19 13:23:31 |
| R121.htm | 60445 | 2021-02-19 13:23:31 |
| R122.htm | 26766 | 2021-02-19 13:23:31 |
| R123.htm | 33389 | 2021-02-19 13:23:31 |
| R124.htm | 15608 | 2021-02-19 13:23:31 |
| R125.htm | 63661 | 2021-02-19 13:23:31 |
| R126.htm | 24535 | 2021-02-19 13:23:31 |
| R127.htm | 12515 | 2021-02-19 13:23:31 |
| R128.htm | 16925 | 2021-02-19 13:23:31 |
| R129.htm | 71971 | 2021-02-19 13:23:31 |
| R13.htm | 22070 | 2021-02-19 13:23:31 |
| R130.htm | 28791 | 2021-02-19 13:23:31 |
| R131.htm | 33592 | 2021-02-19 13:23:31 |
| R132.htm | 12958 | 2021-02-19 13:23:31 |
| R133.htm | 10796 | 2021-02-19 13:23:31 |
| R134.htm | 22862 | 2021-02-19 13:23:31 |
| R135.htm | 29438 | 2021-02-19 13:23:31 |
| R136.htm | 9825 | 2021-02-19 13:23:31 |
| R137.htm | 17860 | 2021-02-19 13:23:31 |
| R138.htm | 25451 | 2021-02-19 13:23:31 |
| R139.htm | 43433 | 2021-02-19 13:23:31 |
| R14.htm | 69618 | 2021-02-19 13:23:31 |
| R140.htm | 12135 | 2021-02-19 13:23:31 |
| R141.htm | 17340 | 2021-02-19 13:23:31 |
| R142.htm | 15626 | 2021-02-19 13:23:31 |
| R143.htm | 14940 | 2021-02-19 13:23:31 |
| R144.htm | 15126 | 2021-02-19 13:23:31 |
| R145.htm | 25363 | 2021-02-19 13:23:31 |
| R146.htm | 11630 | 2021-02-19 13:23:31 |
| R147.htm | 6001 | 2021-02-19 13:23:31 |
| R148.htm | 25785 | 2021-02-19 13:23:31 |
| R149.htm | 38145 | 2021-02-19 13:23:31 |
| R15.htm | 21727 | 2021-02-19 13:23:31 |
| R150.htm | 106947 | 2021-02-19 13:23:31 |
| R16.htm | 19261 | 2021-02-19 13:23:31 |
| R17.htm | 26330 | 2021-02-19 13:23:31 |
| R18.htm | 38184 | 2021-02-19 13:23:31 |
| R19.htm | 64927 | 2021-02-19 13:23:31 |
| R2.htm | 109576 | 2021-02-19 13:23:31 |
| R20.htm | 43768 | 2021-02-19 13:23:31 |
| R21.htm | 77316 | 2021-02-19 13:23:31 |
| R22.htm | 129607 | 2021-02-19 13:23:31 |
| R23.htm | 28404 | 2021-02-19 13:23:31 |
| R24.htm | 32696 | 2021-02-19 13:23:31 |
| R25.htm | 57261 | 2021-02-19 13:23:31 |
| R26.htm | 112284 | 2021-02-19 13:23:31 |
| R27.htm | 18249 | 2021-02-19 13:23:31 |
| R28.htm | 275315 | 2021-02-19 13:23:31 |
| R29.htm | 121641 | 2021-02-19 13:23:31 |
| R3.htm | 48445 | 2021-02-19 13:23:31 |
| R30.htm | 46515 | 2021-02-19 13:23:31 |
| R31.htm | 122679 | 2021-02-19 13:23:31 |
| R32.htm | 7020 | 2021-02-19 13:23:31 |
| R33.htm | 51616 | 2021-02-19 13:23:31 |
| R34.htm | 78903 | 2021-02-19 13:23:31 |
| R35.htm | 162700 | 2021-02-19 13:23:31 |
| R36.htm | 20384 | 2021-02-19 13:23:31 |
| R37.htm | 70353 | 2021-02-19 13:23:31 |
| R38.htm | 20249 | 2021-02-19 13:23:31 |
| R39.htm | 19148 | 2021-02-19 13:23:31 |
| R4.htm | 17849 | 2021-02-19 13:23:31 |
| R40.htm | 19794 | 2021-02-19 13:23:31 |
| R41.htm | 39427 | 2021-02-19 13:23:31 |
| R42.htm | 70554 | 2021-02-19 13:23:31 |
| R43.htm | 41356 | 2021-02-19 13:23:31 |
| R44.htm | 77948 | 2021-02-19 13:23:31 |
| R45.htm | 129356 | 2021-02-19 13:23:31 |
| R46.htm | 24960 | 2021-02-19 13:23:31 |
| R47.htm | 54276 | 2021-02-19 13:23:31 |
| R48.htm | 100027 | 2021-02-19 13:23:31 |
| R49.htm | 16197 | 2021-02-19 13:23:31 |
| R5.htm | 120319 | 2021-02-19 13:23:31 |
| R50.htm | 271602 | 2021-02-19 13:23:31 |
| R51.htm | 157064 | 2021-02-19 13:23:31 |
| R52.htm | 48531 | 2021-02-19 13:23:31 |
| R53.htm | 129941 | 2021-02-19 13:23:31 |
| R54.htm | 165709 | 2021-02-19 13:23:31 |
| R55.htm | 11762 | 2021-02-19 13:23:31 |
| R56.htm | 93152 | 2021-02-19 13:23:31 |
| R57.htm | 5041 | 2021-02-19 13:23:31 |
| R58.htm | 25782 | 2021-02-19 13:23:31 |
| R59.htm | 29213 | 2021-02-19 13:23:31 |
| R6.htm | 11433 | 2021-02-19 13:23:31 |
| R60.htm | 52347 | 2021-02-19 13:23:31 |
| R61.htm | 29515 | 2021-02-19 13:23:31 |
| R62.htm | 18314 | 2021-02-19 13:23:31 |
| R63.htm | 5584 | 2021-02-19 13:23:31 |
| R64.htm | 46406 | 2021-02-19 13:23:31 |
| R65.htm | 14064 | 2021-02-19 13:23:31 |
| R66.htm | 47817 | 2021-02-19 13:23:31 |
| R67.htm | 56219 | 2021-02-19 13:23:31 |
| R68.htm | 10607 | 2021-02-19 13:23:31 |
| R69.htm | 14059 | 2021-02-19 13:23:31 |
| R7.htm | 101938 | 2021-02-19 13:23:31 |
| R70.htm | 14816 | 2021-02-19 13:23:31 |
| R71.htm | 9846 | 2021-02-19 13:23:31 |
| R72.htm | 28999 | 2021-02-19 13:23:31 |
| R73.htm | 16132 | 2021-02-19 13:23:31 |
| R74.htm | 26622 | 2021-02-19 13:23:31 |
| R75.htm | 4711 | 2021-02-19 13:23:31 |
| R76.htm | 11675 | 2021-02-19 13:23:31 |
| R77.htm | 14008 | 2021-02-19 13:23:31 |
| R78.htm | 54661 | 2021-02-19 13:23:31 |
| R79.htm | 5296 | 2021-02-19 13:23:31 |
| R8.htm | 40245 | 2021-02-19 13:23:31 |
| R80.htm | 51818 | 2021-02-19 13:23:31 |
| R81.htm | 47023 | 2021-02-19 13:23:31 |
| R82.htm | 34479 | 2021-02-19 13:23:31 |
| R83.htm | 22979 | 2021-02-19 13:23:31 |
| R84.htm | 5474 | 2021-02-19 13:23:31 |
| R85.htm | 21337 | 2021-02-19 13:23:31 |
| R86.htm | 13087 | 2021-02-19 13:23:31 |
| R87.htm | 26819 | 2021-02-19 13:23:31 |
| R88.htm | 60915 | 2021-02-19 13:23:31 |
| R89.htm | 43488 | 2021-02-19 13:23:31 |
| R9.htm | 5777 | 2021-02-19 13:23:31 |
| R90.htm | 6720 | 2021-02-19 13:23:31 |
| R91.htm | 17815 | 2021-02-19 13:23:31 |
| R92.htm | 36286 | 2021-02-19 13:23:31 |
| R93.htm | 30918 | 2021-02-19 13:23:31 |
| R94.htm | 55373 | 2021-02-19 13:23:31 |
| R95.htm | 20053 | 2021-02-19 13:23:31 |
| R96.htm | 6516 | 2021-02-19 13:23:31 |
| R97.htm | 37736 | 2021-02-19 13:23:31 |
| R98.htm | 7965 | 2021-02-19 13:23:31 |
| R99.htm | 8165 | 2021-02-19 13:23:31 |
| report.css | 2768 | 2021-02-19 13:23:31 |
| Show.js | 1086 | 2021-02-19 13:23:31 |