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| 0000018926-20-000016-index.html | 2020-05-07 16:31:16 | |
| 0000018926-20-000016.txt | 2020-05-07 16:31:16 | |
 0000018926-20-000016-xbrl.zip | 305530 | 2020-05-07 16:31:16 |
| ctl-20200331.xsd | 51064 | 2020-05-07 16:31:16 |
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| ctl-20200331_lab.xml | 759089 | 2020-05-07 16:31:16 |
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| ctl2020033110q.htm | 1928403 | 2020-05-07 16:31:16 |
| ctl2020033110qex181.htm | 4721 | 2020-05-07 16:31:16 |
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| ctl2020033110qex322.htm | 6632 | 2020-05-07 16:31:16 |
| ctl2020033110q_htm.xml | 1844127 | 2020-05-07 16:31:16 |
 ctllogo1a04.jpg | 17400 | 2020-05-07 16:31:16 |
| FilingSummary.xml | 42611 | 2020-05-07 16:31:16 |
| Financial_Report.xlsx | 92445 | 2020-05-07 16:31:16 |
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| report.css | 2767 | 2020-05-07 16:31:16 |
| Show.js | 1085 | 2020-05-07 16:31:16 |