Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000018926-20-000028-index-headers.html | 2020-11-05 16:22:19 | |
| 0000018926-20-000028-index.html | 2020-11-05 16:22:19 | |
| 0000018926-20-000028.txt | 2020-11-05 16:22:19 | |
 0000018926-20-000028-xbrl.zip | 393010 | 2020-11-05 16:22:19 |
| ctl-20200930.htm | 2517332 | 2020-11-05 16:22:19 |
| ctl-20200930.xsd | 52156 | 2020-11-05 16:22:19 |
| ctl-20200930_cal.xml | 104484 | 2020-11-05 16:22:19 |
| ctl-20200930_def.xml | 335440 | 2020-11-05 16:22:19 |
 ctl-20200930_g1.jpg | 9569 | 2020-11-05 16:22:19 |
| ctl-20200930_htm.xml | 2417687 | 2020-11-05 16:22:19 |
| ctl-20200930_lab.xml | 708632 | 2020-11-05 16:22:19 |
| ctl-20200930_pre.xml | 481592 | 2020-11-05 16:22:19 |
| FilingSummary.xml | 42464 | 2020-11-05 16:22:19 |
| Financial_Report.xlsx | 111932 | 2020-11-05 16:22:19 |
 image_01.jpg | 28850 | 2020-11-05 16:22:19 |
| lumn2018equityincentiv.htm | 128909 | 2020-11-05 16:22:19 |
| lumn2020093010qex311.htm | 9553 | 2020-11-05 16:22:19 |
| lumn2020093010qex312.htm | 9382 | 2020-11-05 16:22:19 |
| lumn2020093010qex321.htm | 4660 | 2020-11-05 16:22:19 |
| lumn2020093010qex322.htm | 4741 | 2020-11-05 16:22:19 |
| MetaLinks.json | 736195 | 2020-11-05 16:22:19 |
| R1.htm | 57980 | 2020-11-05 16:22:19 |
| R10.htm | 15254 | 2020-11-05 16:22:19 |
| R11.htm | 19024 | 2020-11-05 16:22:19 |
| R12.htm | 36526 | 2020-11-05 16:22:19 |
| R13.htm | 51310 | 2020-11-05 16:22:19 |
| R14.htm | 24909 | 2020-11-05 16:22:19 |
| R15.htm | 72842 | 2020-11-05 16:22:19 |
| R16.htm | 9365 | 2020-11-05 16:22:19 |
| R17.htm | 39336 | 2020-11-05 16:22:19 |
| R18.htm | 36110 | 2020-11-05 16:22:19 |
| R19.htm | 18062 | 2020-11-05 16:22:19 |
| R2.htm | 71723 | 2020-11-05 16:22:19 |
| R20.htm | 23385 | 2020-11-05 16:22:19 |
| R21.htm | 243490 | 2020-11-05 16:22:19 |
| R22.htm | 28924 | 2020-11-05 16:22:19 |
| R23.htm | 14725 | 2020-11-05 16:22:19 |
| R24.htm | 80475 | 2020-11-05 16:22:19 |
| R25.htm | 4992 | 2020-11-05 16:22:19 |
| R26.htm | 21793 | 2020-11-05 16:22:19 |
| R27.htm | 33354 | 2020-11-05 16:22:19 |
| R28.htm | 47031 | 2020-11-05 16:22:19 |
| R29.htm | 17919 | 2020-11-05 16:22:19 |
| R3.htm | 36343 | 2020-11-05 16:22:19 |
| R30.htm | 65886 | 2020-11-05 16:22:19 |
| R31.htm | 9366 | 2020-11-05 16:22:19 |
| R32.htm | 34461 | 2020-11-05 16:22:19 |
| R33.htm | 34936 | 2020-11-05 16:22:19 |
| R34.htm | 13419 | 2020-11-05 16:22:19 |
| R35.htm | 65735 | 2020-11-05 16:22:19 |
| R36.htm | 228571 | 2020-11-05 16:22:19 |
| R37.htm | 14392 | 2020-11-05 16:22:19 |
| R38.htm | 85440 | 2020-11-05 16:22:19 |
| R39.htm | 47808 | 2020-11-05 16:22:19 |
| R4.htm | 17621 | 2020-11-05 16:22:19 |
| R40.htm | 19788 | 2020-11-05 16:22:19 |
| R41.htm | 25957 | 2020-11-05 16:22:19 |
| R42.htm | 19590 | 2020-11-05 16:22:19 |
| R43.htm | 12996 | 2020-11-05 16:22:19 |
| R44.htm | 15755 | 2020-11-05 16:22:19 |
| R45.htm | 14549 | 2020-11-05 16:22:19 |
| R46.htm | 19326 | 2020-11-05 16:22:19 |
| R47.htm | 11834 | 2020-11-05 16:22:19 |
| R48.htm | 13903 | 2020-11-05 16:22:19 |
| R49.htm | 22403 | 2020-11-05 16:22:19 |
| R5.htm | 96232 | 2020-11-05 16:22:19 |
| R50.htm | 81956 | 2020-11-05 16:22:19 |
| R51.htm | 18898 | 2020-11-05 16:22:19 |
| R52.htm | 114746 | 2020-11-05 16:22:19 |
| R53.htm | 11271 | 2020-11-05 16:22:19 |
| R54.htm | 29634 | 2020-11-05 16:22:19 |
| R55.htm | 56195 | 2020-11-05 16:22:19 |
| R56.htm | 13874 | 2020-11-05 16:22:19 |
| R57.htm | 22212 | 2020-11-05 16:22:19 |
| R58.htm | 9260 | 2020-11-05 16:22:19 |
| R59.htm | 8910 | 2020-11-05 16:22:19 |
| R6.htm | 24097 | 2020-11-05 16:22:19 |
| R60.htm | 9273 | 2020-11-05 16:22:19 |
| R61.htm | 13097 | 2020-11-05 16:22:19 |
| R62.htm | 141116 | 2020-11-05 16:22:19 |
| R63.htm | 43383 | 2020-11-05 16:22:19 |
| R64.htm | 43908 | 2020-11-05 16:22:19 |
| R65.htm | 21435 | 2020-11-05 16:22:19 |
| R66.htm | 36605 | 2020-11-05 16:22:19 |
| R67.htm | 41023 | 2020-11-05 16:22:19 |
| R68.htm | 12233 | 2020-11-05 16:22:19 |
| R7.htm | 81439 | 2020-11-05 16:22:19 |
| R8.htm | 4645 | 2020-11-05 16:22:19 |
| R9.htm | 52515 | 2020-11-05 16:22:19 |
| R9999.htm | 7241 | 2020-11-05 16:22:19 |
| report.css | 2767 | 2020-11-05 16:22:19 |
| Show.js | 1085 | 2020-11-05 16:22:19 |